US20030001320A1 - Sintered metal oxide articles and methods of making - Google Patents
Sintered metal oxide articles and methods of making Download PDFInfo
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- US20030001320A1 US20030001320A1 US10/224,691 US22469102A US2003001320A1 US 20030001320 A1 US20030001320 A1 US 20030001320A1 US 22469102 A US22469102 A US 22469102A US 2003001320 A1 US2003001320 A1 US 2003001320A1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
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- Magnetite filters were made from hematite powder according to an embodiment of the present invention.
Abstract
Methods of making metal oxide articles, preferably iron oxide articles, and articles thereby produced. The method comprises the steps of slightly pressing powder to a compact, the powder consisting essentially of a first oxide of the metal; and subjecting the compact to a heat treatment that causes the powder to sinter into a unitary body and results in the transformation of at least a portion of the first oxide to a second oxide by oxidation or deoxidation during the heat treatment. In disclosed embodiments, the heat treatment is conducted either in air at atmospheric pressure or at a subatmospheric pressure. The method optionally includes more heating/cooling steps resulting in additional oxidation/deoxidation cycles. Sintered iron oxide articles of the invention have high mechanical strengths and interconnected pore structures, providing for efficient filtering of liquids and gases.
Description
- The present invention relates to methods of making sintered metal oxide articles having desired mechanical properties and interconnected pore structures, and oxide articles thereby produced.
- Sintering of inorganic powder compacts into useful solid products is a common and efficient way of fabricating metals, ceramics, and cermets. The general pattern of ceramic sintering includes three stages—initial, intermediate, and final. In the initial stage, the pore shape may vary greatly depending on the size and geometry of particle contacts, and the pore structure is open and fully interconnected. In the intermediate stage, where the porosity typically shrinks to 40-10%, the pores become smoother and typically have a cylindrical structure that remains interconnected. The open pore network becomes unstable when the porosity is reduced to about 8%; then, the cylindrical pores collapse into spherical pores, which become closed and isolated. The appearance of isolated pores manifests the beginning of the final stage of sintering, leading to the densest products.
- Major efforts in ceramic sintering have been made to obtain advanced materials such as electronic ceramics, structural ceramics, and high toughness composites where desired properties are sought to be reached at maximal densification (minimal porosity). The use of ceramic materials that have been sintered through only the intermediate sintering stage, however, has been more limited. One such use of these materials is in the filtration of gases and liquids. Among ceramic metal oxides, filter materials which have been obtained are commonly made of alumina (Al2O3), zirconia (ZrO2), and aluminum-silicates.
- The intrinsic properties of iron oxides, hematite (α-Fe2O3) and magnetite (Fe3O4), make them well-suited for diverse applications. These oxides are among the least expensive and naturally abundant substances. They are refractory ceramic materials that are chemically stable in various gas and liquid media, hematite being particularly appropriate for use in corrosive and oxidative environments. Furthermore, hematite and magnetite are environmentally benign, which make them suitable for water filtration and various applications in food, wine, pharmaceutical and other industries where environmental and health requirements are paramount. Moreover, hematite is electrically non-conductive and non-magnetic, and magnetite is highly conductive and magnetic, so the two iron oxides cover a wide spectrum of desirable electric and magnetic properties.
- There exist numerous methods to prepare hematite and magnetite powders to be used as powders in various applications. However, there is a need in efficient and practical (economical) processes of making mechanically strong hematite and magnetite articles by sintering the respective powders, particularly into filter materials. U.S. Pat. No. 3,984,229 discusses attempts to briquette iron oxide raw materials at elevated temperatures of 800° C. to 1100° C. and concludes that it has been impossible to find a sufficiently strong material for the briquette molds (col. 1, lines 60-68). U.S. Pat. No. 5,512,195 describes efficient transformation of hematite powder into a magnetite single phase by mixing hematite powder with various organic substances, serving as a binder and reducing agent, and sintering at 1200° C. to 1450° C. in an inert gas. The strength of the sintered magnetite phase and its pore structure have not been characterized.
- To obtain strong sintered articles, high pressure is conventionally employed. For example, U.S. Pat. No. 4,019,239 describes manufacturing magnetite articles by sintering and hot compacting magnetite powder in air at 900° C. to 1300° C. and a pressure of 100 to 600 MPa (1000 to 6000 atm), leading to a dense body with a porosity less than 3%.
- In addition to high pressure requirements, conventional sintering of metal oxide powders usually requires binders and other extraneous agents to shape a powder preform and obtain the desirable composition. For example, in U.S. Pat. No. 5,512,195, sintering of hematite powder to a magnetite single phase requires mixing hematite powder with various organic substances that serve as binders and reducing agents. By contrast, the sintering of hematite powder without incorporation of any organic substance at 1200° C. to 1450° C. in an inert gas makes the hematite-magnetite conversion so low that the process is unfit for industrialization. It would be highly desirable to develop an effective and economical sintering process of iron oxides without the use of any additives or high pressures.
- In one aspect, the present invention includes a method of making metal oxide articles, and preferably iron oxide articles. The method comprises the steps of slightly pressing powder to a compact, the powder consisting essentially of a first oxide of the metal; and subjecting the compact to a heat treatment that causes the powder to sinter into a unitary body and results in the transformation of at least a portion of the first oxide to a second oxide of the metal. The powder comprises a first oxide that is substantially free from additives, at least a portion of which is transformed to a second oxide by oxidation or deoxidation during the method of the present invention. The method optionally includes one or more heating/cooling steps during the heat treatment process, resulting in additional oxidation/deoxidation cycles.
- In another aspect, the invention includes sintered metal oxide articles, and preferably iron oxide articles, made by the method of the invention.
- One advantage of the present invention is that it provides sintered metal oxide articles, and preferably iron oxide articles, of high mechanical strength and other desired mechanical properties.
- Another advantage of the invention is that it provides sintered metal oxide articles, and preferably iron oxide articles, having interconnected pore structures capable of efficient filtering gases and liquids.
- Yet another advantage of the invention is that it provides efficient and economical processes of making sintered metal oxide articles, and preferably iron oxide articles, without the need for sintering additives of any kind and/or high pressures.
- The present invention provides sintered metal oxide articles, and preferably iron oxide articles, of desired mechanical properties, such as high strength, and an interconnected pore structure capable of efficient filtering of gases and liquids. In accordance with the invention, metal oxide powder is subjected to a heat treatment to transform at least a portion of the oxide into a different oxide. The heat treatment is conducted at temperatures less than the melting points of the oxides and for suitable holding times to sinter the powder into a unitary oxide article. The powders used in the present invention are said to consist essentially of metal oxide in that such powders are substantially free from other compounds and additives such as binders, reducing agents, and the like.
- Heating regimes for sintering are chosen to cause the oxidation and/or deoxidation of the oxide such that it is transformed to a different oxide, with several oxidation/deoxidation cycles possible. Although not wishing to be bound by theory, it is believed that oxygen transport during deoxidation and/or oxidation contributes to effective sintering and the resulting desired mechanical properties and uniformity in appearance and interconnected pore structure of the sintered article body. The invention thus obviates the need for sintering additives and high sintering pressures.
- The present invention is described with specific reference to iron oxide articles, and specifically iron oxide filters, that are made by sintering iron oxide powders. The scope of the invention, however, includes articles of other metal oxide materials, of any form and intended use, that are made by sintering metal oxide powders that undergo oxidation and/or deoxidation during the sintering process.
- In cited embodiments, sintered iron oxide filters are produced in accordance with the present invention. For example, in one embodiment, hematite (α-Fe2O3) filters are made from magnetite (Fe3O4) powder. In another embodiment, hematite filters are made from hematite powder, which transforms to magnetite and back to hematite during sintering. In yet another embodiment, magnetite filters are made from hematite powder.
- The filters are made in a sintering process wherein metal oxide powder is placed into a mold and hand-pressed into a compact and subjected to a suitable heat treatment to cause sintering into a unitary body and oxidative/deoxidative transformation of the powder. Preferred molds are alumina rings typically having an inner diameter of from about 10 to about 70 mm, and a height of from about 3 to about 60 mm. The powder particles are of any suitable size for sintering such as, for example, about 50 to about 200 microns. Such powders are readily available.
- The heat treatment of the invention is selected based on the thermal properties of iron oxides. In air at atmospheric pressure, hematite is stable at elevated temperatures up to about 1350° C. but decomposes to magnetite at higher temperatures up to about 1450° C. Because magnetite begins to decompose to wustite FeO at temperatures above 1450° C., this represents an upper limit of sintering temperatures in atmospheric air. For subatmospheric pressures, suitable sintering temperatures are lower according to the pressure within a vacuum furnace. In cited embodiments of the present invention, vacuum sintering typically occurs at a pressure within the range of about 10−4 to about 10−5 torr, wherein hematite begins to decompose to magnetite at about 750° C. and magnetite begins to melt at about 1300° C. The process is optimized on the premise that higher sintering temperatures allow for shorter sintering times. At pressures of about 10−4 to about 10−5 torr, efficient sintering occurs at 950° C. to 1250° C., preferably at 1000° C. to 1250° C., and more preferably at 1150° C. to 1200° C.
- Embodiments of the present invention are further described with reference to the following non-limiting examples. In all examples, the iron oxide materials, namely hematite and magnetite, are distinguished by stoichiometry and magnetic properties
- Hematite filters were made from magnetite powder according to an embodiment of the present invention.
- Magnetite powder was obtained my milling thin-walled magnetite structures produced in accordance with U.S. Pat. Nos. 5,786,296 and 5,814,164, which are incorporated herein by reference. The powder was separated on commercial sieves into fractions according to the following particle size ranges (in microns): 160 to 100, 100 to 80, 80 to 50 and <50. Portions of each powder fraction were poured into closed-ended molds to form multiple (e.g., at least three) samples of each powder fraction. The molds were in the form of alumina rings having an internal diameter of about 11 mm and a height of about 8 mm, placed on a platinum plate serving as the mold bottom. Each sample was compacted by hand with a metal rod to a density of from about 2.3 to about 3.5 g/cm3, and placed at room temperature into an electrically heated and unsealed furnace for subsequent heat treatment in atmospheric air.
- Groups of samples were subjected to the following separate heat treatments (all heating rates were about 2° C. per minute), based on the inventors' finding that the sintering process in air was inefficient below around 1350° C. but efficient for temperatures up to around 1450° C.:
- (a) Samples of all powder fractions were heated to about 1300° C. and held for about three hours (thus causing a transformation from magnetite to hematite), then heated to about 1450° C. and held for about 15 minutes (thus causing a transformation from hematite to magnetite), and then furnace cooled (thus causing a transformation from magnetite to hematite) (as used herein, “furnace cooled” refers to cooling by leaving samples in the furnace after sintering and turning off the furnace power),
- (b) Samples of powder fractions 160 to 100 microns, 100 to 80 microns, and 80 to 50 microns were heated to about 1450° C. and held for about 15 minutes (during which heating, the magnetite transforms to hematite and back to magnetite), then cooled to about 1300° C. and held for about three hours (thus causing a transformation from magnetite to hematite), and then furnace cooled.
- (c) Samples of powder fractions 160 to 100 microns were heated to about 1200° C. and held for about three hours (thus causing a transformation from magnetite to hematite), then heated to about 1450° C. and held for about 15 minutes (thus causing a transformation from hematite to magnetite), and then furnace cooled (thus causing a transformation from magnetite to hematite).
- As described, each of the heat treatments resulted in more than one transformation between magnetite and hematite. After the samples were cooled to about room temperature, they were removed from the molds. The resulting hematite samples had substantially the same appearance and properties regardless of variations in the heat treatments employed. The sample densities were within the range of about 2.3 to about 3.4 g/cm3, which is about 45 to about 65 percent of hematite bulk density (i.e., corresponding to a porosity of about 55 to about 35 percent, respectively). The samples were mechanically strong enough to be ground by common abrasives, and were characterized by an open interconnected pore structure capable of effective filtration of liquids. This Example thus demonstrates a relatively simple method for making strong, uniform iron oxide filters, particularly hematite filters, in accordance with the present invention.
- Hematite filters were made from hematite powder according to an embodiment of the present invention.
- Hematite powder was obtained my milling thin-walled hematite structures produced in accordance with U.S. Pat. Nos. 5,786,296 and 5,814,164, which are incorporated herein by reference. The powder was separated according to size and placed into molds according to Example 1.
- Samples (e.g., at least three) were heated at a rate of about 2° C. per minute to about 1450° C., held for about three hours (thus causing a transformation from hematite to magnetite), and furnace cooled (thus causing a transformation from magnetite to hematite). The resulting sintered hematite samples could be removed from their molds but were mechanically weak such that they were crushed by slight hand pressure.
- In an effort to improve mechanical strength, additional powder samples were heated to about 1300° C. and held for about three hours, then heated to about 1450° C. to about 1500° C., and held for about one hour (thus causing a transformation from hematite to magnetite), and then furnace cooled (thus causing a transformation from magnetite to hematite). The sintered samples showed only a marginal increase in strength. As such, substantially monotonic heating followed by monotonic cooling was found to be inefficient for producing hematite filters from hematite powder.
- However, when more cooling/heating steps were added to the heat treatment to provide more oxidation/deoxidation cycles, the resulting hematite samples showed a significant increase in strength. For example, powder samples were heated to about 1250° C. and held for about three hours, then heated to about 1450° C. and held for about 15 minutes (thus causing a transformation from hematite to magnetite), then cooled to about 1250° C. and held for about 15 minutes (thus causing a transformation from magnetite to hematite), then heated again to about 1450° C. and held for about 15 minutes (thus causing a transformation from hematite to magnetite), then cooled again to about 1250° C. and held for about three hours (thus causing a transformation from magnetite to hematite), and then furnace cooled. The resulting sintered hematite samples were strong enough to be ground by common abrasives. Moreover, the resulting samples were uniform in appearance and were characterized by an open interconnected pore structure.
- Although not wishing to be bound by theory, the significant increase in filter strength resulting from the several oxidation/deoxidation cycles may be due to oxygen transport within the sintered body contributing to effective sintering, and to the resulting mechanical properties and uniformity of the sintered article body having an interconnecting pore structure.
- Magnetite filters were made from hematite powder according to an embodiment of the present invention.
- Hematite powder was made and separated according to size and placed into molds according to Example 2. Samples (e.g., at least three) were placed in a vacuum furnace at a pressure of about 10−4 to about 10−5 torr, heated at a rate of about 8-9° C. per minute to about 1210° C. to about 1250° C. and held for about 5 to about 30 minutes (thus causing a transformation from hematite to magnetite), and then furnace cooled while maintaining vacuum (thus preventing a transformation from magnetite to hematite, which would occur in air).
- The sintered magnetite filters were easily removed from their molds, and were mechanically strong enough to be ground by common abrasives. The sample densities were within the range of about 2.3 to about 3.4 g/cm3, which is about 45 to about 65 percent of magnetite bulk density (i.e., corresponding to a porosity of about 55 to about 35 percent, respectively), typically increasing with a decrease in the initial hematite particle size. The sintered samples were uniform and were characterized by an open interconnected pore structure.
- Magnetite filters were made from magnetite powder. Magnetite power was made, separated according to size and placed into molds according to Example 1. Samples (e.g., at least three) were placed in a vacuum furnace at a pressure of about 10−4 to about 10−5 torr, heated at a rate of about 8° C. per minute to about 1250° C. and held for about 30 minutes, and then furnace cooled.
- In this example, the iron oxide (magnetite) powder did not undergo any transformation to any other iron oxide during sintering. The resulting sintered magnetite filters were significantly weaker and much less uniform than the magnetic filters made from hematite powder as described in Example 3. Notably, the weaker magnetite samples in Example 4 had, on average, higher densities (up to about 4 g/cm3) than the magnetite samples produced in Example 3. While not wishing to be bound by theory, this unusual inverse relation between strength and density indicates that in producing samples of high strength the oxidation/deoxidation cycles are more important than simple densification.
- The hematite and magnetite filters formed according to Examples 1 to 3 were evaluated against standard glass filters with known pore sizes. The pore size of each hematite and magnetite filter was estimated by determining their ability to filter freshly prepared suspensions of Fe(OH)3, CaCO3 and Al(OH)3. Filtration efficiency for all filters was evaluated by measuring the water filter productivity (“WFP”), which is the volume of water filtrated per filter unit surface area per unit time, for a given pressure. The results of the filtration testing are shown in Table I.
- The filtration efficiencies for the filters produced in accordance with Examples 1 to 3 were found to be much greater than efficiencies for glass filters of comparable pore sizes. For example, for a hematite filter made in accordance with Example 1 from magnetite powder and having a pore size up to about 40 microns, the WFP was found to be 829 cm3/cm2 min at a pressure of about 10 torr. By comparison, a glass filter having a similar pore size has a WPF of about 100 cm3/cm2 min at the same pressure. As another example, for a hematite filter made in accordance with Example 1 from magnetite powder and having a pore size up to about 15 microns, the WFP was found to be 186 cm3/cm2 min at a pressure of about 10 torr. By comparison, a glass filter having a similar pore size has a WPF of about 3 cm3/cm2 min at the same pressure.
- Inspection of Table I reveals several structure-property relationships for the sintered filters of the present invention. For example, for a given sintering process, a decrease in powder particle size results in a decrease in filter pore size and an increase in filter density. Also, a decrease in powder particle size results in a decrease in WFP.
TABLE I Results of filtration testing for sintered iron oxide filters tested under a pressure of about 10 torr. WFP Fil- Sintered Powder (cm3/ ter Powder Filter fraction Density Pore size cm2 no. Material Material (microns) (g/cm3) (microns) min) 1 magnetite hematite 160 − 2.4 40 − 15 829 100 2 magnetite hematite 100 − 83 2.7 15 − 10 186 3 magnetite hematite 83 − 50 3.1 <10 56 4 hematite magnetite 100 − 83 2.5 15 − 10 160 5 hematite magnetite 100 − 83 2.6 40 − 15 159 6 hematite hematite 160 − 2.6 100 − 40 179 100 7 hematite hematite 100 − 83 2.7 40 − 15 58 8 hematite hematite 100 − 83 2.9 15 − 10 46 - The mechanical strength of filters 1 to 3, as listed in Table I, was evaluated on the basis of crush strength. Crush strength was measured by polishing cylindrical filter samples, having diameters of about 10 to about 11 millimeters and heights of about 5 to about 6 millimeters, to obtain smooth, parallel top and bottom surfaces. The samples were wrapped by a polyethylene film, placed in a press (compressive force about 39 kN), and compressed at a rate of about 0.4 atm/sec. The moment of sample crush was distinctly seen on a press manometer. These filters were found to have crush strengths of about 30 atm, about 200 atm and about 260 atm, respectively, showing a strong inverse correlation with powder particle size. This expected inverse correlation is an additional indication that the filters of the present invention possess a normal interconnected pore structure.
- The results of the filtration demonstrate that the methods of the present invention result in the production of strong iron oxide articles having an interconnected pore structure suitable for efficient filtering.
- The present invention provides a novel method of making sintered metal oxide articles. The sintered articles of the invention are characterized by desired mechanical properties, such as high strength, and an interconnected pore structure. Those with skill in the art may recognize various modifications to the embodiments of the invention described and illustrated herein. Such modifications are meant to be covered by the spirit and scope of the appended claims.
Claims (38)
1. A method of making a metal oxide article, comprising the steps of:
pressing powder to a compact, said powder consisting essentially of a first oxide of the metal; and
subjecting said compact to a heat treatment, said heat treatment causing said powder to sinter into a unitary body and resulting in the transformation of at least a portion of said first oxide to a second oxide of the metal.
2. The method of claim 1 , wherein said step of subjecting said compact to said heat treatment comprises the steps of:
subjecting said compact to a first temperature such that at least a portion of said first oxide transforms to said second oxide; and
subjecting said compact to a second temperature after said step of subjecting said compact to said first temperature, said step of subjecting said compact to said second temperature causing at least a portion of said second oxide to transform to said first oxide.
3. The method of claim 2 , wherein said second temperature is greater than said first temperature.
4. The method of claim 2 , wherein said second temperature is less than said first temperature.
5. The method of claim 2 , wherein said heat treatment further comprises the step of subjecting said compact to a third temperature after said step of subjecting said compact to said second temperature, thus causing at least a portion of said first oxide to transform to said second oxide.
6. The method of claim 5 , wherein said third temperature is greater than said second temperature.
7. The method of claim 5 , wherein said second temperature is less than said second temperature.
8. The method of claim 1 , wherein at least a portion of said heat treatment is conducted at a subatmospheric pressure.
9. The method of claim 1 , wherein at least a portion of said heat treatment is conducted in air at atmospheric pressure.
10. A method of making an iron oxide article, comprising the steps of:
pressing powder to a compact, said powder consisting essentially of a first iron oxide; and
subjecting said compact to a heat treatment, said heat treatment causing said powder to sinter into a unitary body and resulting in the transformation of at least a portion of said first iron oxide to a second iron oxide.
11. The method of claim 10 , wherein
said first iron oxide is hematite;
said second iron oxide is magnetite;
said heat treatment includes the step of heating said compact to a temperature up to about 1250° C.; and
said heat treatment is conducted at a subatmospheric pressure.
12. The method of claim 11 , wherein said subatmospheric pressure is within the range of about 10−4 torr to about 10−5 torr.
13. The method of claim 10 , wherein said step of subjecting said compact to said heat treatment comprises the steps of:
subjecting said compact to a first temperature such that at least a portion of said first iron oxide transforms to said second iron oxide;
subjecting said compact to a second temperature after said step of subjecting said compact to said first temperature, said step of subjecting said compact to said second temperature causing at least a portion of said second iron oxide to transform to said first iron oxide; and
subjecting said compact to a third temperature after said step of subjecting said compact to said second temperature, said step of subjecting said compact to said third temperature causing at least a portion of said first iron oxide to transform to said second iron oxide.
14. The method of claim 13 , wherein
said first iron oxide is magnetite;
said second iron oxide is hematite;
said first temperature is up to about 1300° C.;
said second temperature is up to about 1450° C.;
said third temperature is less than about 1300° C.; and
said heat treatment is conducted in air at atmospheric pressure.
15. The method of claim 13 , further comprising the step of subjecting said compact to a fourth temperature after said step of subjecting said compact to said third temperature, said step of subjecting said compact to said fourth temperature causing at least a portion of said second iron oxide to transform to said first iron oxide.
16. The method of claim 15 , wherein
said first iron oxide is hematite;
said second iron oxide is magnetite;
said first temperature is up to about 1450° C.;
said second temperature is up to about 1250° C.;
said third temperature is up to about 1450° C.;
said fourth temperature is less than about 1300° C.; and
said heat treatment is conducted in air at atmospheric pressure.
17. A sintered metal oxide article made by the process of claim 1 .
18. A sintered metal oxide article made by the process of claim 2 .
19. A sintered metal oxide article made by the process of claim 5 .
20. A sintered iron oxide article made by the process of claim 10 .
21. A sintered iron oxide article made by the process of claim 11 .
22. The iron oxide article of claim 21 , wherein said article has an interconnected pore structure having a pore size of up to about 15 microns and a water filter productivity of at least about 150 cm3/cm2 min.
23. The iron oxide article of claim 21 , wherein said article has an interconnected pore structure having a pore size of up to about 40 microns and a water filter productivity of at least about 150 cm3/cm2 min.
24. The iron oxide article of claim 21 , wherein said article has an interconnected pore structure and a porosity of at least about 35 percent.
25. A sintered iron oxide article made by the process of claim 13 .
26. A sintered iron oxide article made by the process of claim 14 .
27. The iron oxide article of claim 26 , wherein said article has an interconnected pore structure having a pore size of up to about 10 microns and a water filter productivity of at least about 50 cm3/cm2 min.
28. The iron oxide article of claim 27 , wherein said article has a crush strength of at least about 260 atmospheres.
29. The iron oxide article of claim 26 , wherein said article has an interconnected pore structure having a pore size of up to about 15 microns and a water filter productivity of at least about 175 cm3/cm2 min.
30. The iron oxide article of claim 29 , wherein said article has a crush strength of at least about 200 atmospheres.
31. The iron oxide article of claim 26 , wherein said article has an interconnected pore structure and a porosity of at least about 35 percent.
32. The iron oxide article of claim 26 , wherein said article has an interconnected pore structure having a pore size of up to about 40 microns and a water filter productivity of at least about 800 cm3/cm2 min.
33. The iron oxide article of claim 32 , wherein said article has a crush strength of at least about 30 atmospheres.
34. A sintered iron oxide article made by the process of claim 15 .
35. A sintered iron oxide article made by the process of claim 16 .
36. The iron oxide article of claim 35 , wherein said article has an interconnected pore structure having a pore size of up to about 15 microns and a water filter productivity of at least about 40 cm3/cm2 min.
37. The iron oxide article of claim 35 , wherein said article has an interconnected pore structure having a pore size of up to about 40 microns and a water filter productivity of at least about 50 cm3/cm2 min.
38. The iron oxide article of claim 35 , wherein said article has an interconnected pore structure having a pore size of up to about 100 microns and a water filter productivity of at least about 175 cm3/cm2 min.
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Family Cites Families (245)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA475288A (en) | 1951-07-17 | Heath Patriarche Valance | Shock absorbing aircraft skids | |
GB491785A (en) | 1937-02-08 | 1938-09-08 | Albert Leslie Williams | Improvements relating to the manufacture of alternating electric current rectifiers |
US2205263A (en) | 1938-05-06 | 1940-06-18 | Westinghouse Electric & Mfg Co | Copper oxide rectifier |
US2462289A (en) | 1945-06-11 | 1949-02-22 | Harbison Walker Refractories | Furnace refractory construction |
GB709937A (en) | 1950-06-21 | 1954-06-02 | Tno | Preparation of articles having at least a coherent and homogeneous surface layer of magnetite |
US2727842A (en) | 1950-06-21 | 1955-12-20 | Tno | Process for the conversion of at least the surface layer of an iron article into magnetite and thus prepared articles |
GB760166A (en) | 1953-06-12 | 1956-10-31 | Ass Pour Les Etudes Texturales | Process for heat treating mild steel articles |
US2917419A (en) | 1958-03-06 | 1959-12-15 | Sprague Electric Co | Method of forming an adherent oxide film on tantalum and niobium foil |
US3344925A (en) | 1964-08-28 | 1967-10-03 | William A Graham | Plastic liner for oil filter |
US3647534A (en) * | 1965-10-29 | 1972-03-07 | Texas Instruments Inc | Preparation of welding surfaces on semiconductors |
US3505030A (en) | 1965-11-16 | 1970-04-07 | Du Pont | Composite articles of manufacture and apparatus for their use |
US3470067A (en) | 1967-09-19 | 1969-09-30 | Pfizer & Co C | Concentration and purification of viruses from particulate magnetic iron oxide-virus complexes |
US3667270A (en) | 1968-05-01 | 1972-06-06 | Kaninkijke Nl Hoogovens En Sta | Method for smoothing rolls for cold rolling or finishing cold rolling of bright metal sheet or the like |
US3581902A (en) | 1968-10-04 | 1971-06-01 | Minnesota Mining & Mfg | Filter made from powdered metal |
US3597892A (en) | 1969-01-08 | 1971-08-10 | Gen Refractories Co | Refractory brick |
US3630675A (en) | 1969-02-10 | 1971-12-28 | Us Interior | Selective oxidation of ferrous scrap |
JPS4945456B1 (en) | 1969-06-25 | 1974-12-04 | ||
US4050956A (en) | 1970-02-20 | 1977-09-27 | Commonwealth Scientific And Industrial Research Organization | Chemical bonding of metals to ceramic materials |
US3984229A (en) | 1970-04-20 | 1976-10-05 | Boliden Aktiebolag | Method for producing coarse powder, hardened iron oxide material from finely divided raw material substantially consisting of hematite and/or magnetite |
DE2029249A1 (en) | 1970-06-13 | 1971-12-23 | Kraftwerk Union Ag | Process for the treatment of heat exchangers and similar devices in thermal power stations |
US3948785A (en) * | 1971-01-04 | 1976-04-06 | Jean Berchtold | Process of manufacturing ferrite materials with improved magnetic and mechanical properties |
US3746642A (en) | 1971-04-20 | 1973-07-17 | Minnesota Mining & Mfg | Sintered powdered metal filter |
US3892888A (en) | 1971-06-09 | 1975-07-01 | Corning Glass Works | Method of making a magnetic recording and storage device |
US3766642A (en) | 1971-09-27 | 1973-10-23 | Shell Oil Co | Process for preparing a ductile metal ferrite |
BE794292A (en) | 1972-01-21 | 1973-07-19 | Bayer Ag | PROCESS FOR PREPARING FINE-DIVIDED ACICULAR MAGNETIC IRON OXIDES |
US3849115A (en) | 1972-03-24 | 1974-11-19 | Mcdowell Wellman Eng Co | Sintering process |
US3860450A (en) | 1972-05-05 | 1975-01-14 | California Inst Of Techn | Method of forming magnetite thin film |
AT316004B (en) | 1972-08-22 | 1974-06-25 | Oemv Ag | Reaction chamber for the combustion of the CO part of flue gases |
US3930522A (en) | 1973-05-02 | 1976-01-06 | General Refractories Company | Structural ceramic article and method of making same |
US4054627A (en) * | 1973-05-14 | 1977-10-18 | Paul Darrell Ownby | Dense chromium sesquioxide |
GB1486890A (en) | 1973-09-12 | 1977-09-28 | Ici Ltd | Catalysts and their use in hydrogenation |
US3903341A (en) | 1973-09-20 | 1975-09-02 | Universal Oil Prod Co | Ceramic honeycomb structure for accommodating compression and tension forces |
SE376552B (en) | 1973-09-26 | 1975-06-02 | Hoeganaes Ab | |
JPS559045B2 (en) | 1973-10-02 | 1980-03-07 | ||
US4052326A (en) | 1973-10-19 | 1977-10-04 | Basf Aktiengesellschaft | Manufacture of γ-iron(III) oxide |
GB1491445A (en) | 1973-11-08 | 1977-11-09 | Atomic Energy Authority Uk | Catalyst bodies and methods of manufacturing such bodies |
US3896028A (en) | 1973-11-29 | 1975-07-22 | Du Pont | Particulate metal filter medium for polymer melts |
US3945946A (en) | 1973-12-10 | 1976-03-23 | Engelhard Minerals & Chemicals Corporation | Compositions and methods for high temperature stable catalysts |
US4025462A (en) | 1974-03-27 | 1977-05-24 | Gte Sylvania Incorporated | Ceramic cellular structure having high cell density and catalyst layer |
US4006090A (en) | 1974-06-28 | 1977-02-01 | The Dow Chemical Company | Alpha iron (III) oxide crystals and derivatives |
US3948810A (en) | 1974-07-23 | 1976-04-06 | Universal Oil Products Company | Monolithic catalyst support member |
DE2440447C2 (en) | 1974-08-23 | 1980-09-04 | Smit Nijmegen B.V., Nijmegen (Niederlande) | Process for producing an iron oxide layer |
DE2443978C3 (en) | 1974-09-12 | 1982-04-15 | Mannesmann AG, 4000 Düsseldorf | Process for making ice powder |
US3966419B2 (en) | 1974-11-18 | 1988-01-12 | Catalytic converter having monolith with mica support means therefor | |
US4063930A (en) | 1974-11-22 | 1977-12-20 | Republic Steel Corporation | Preparation of weatherable ferrite agglomerate |
US4042738A (en) | 1975-07-28 | 1977-08-16 | Corning Glass Works | Honeycomb structure with high thermal shock resistance |
US4054705A (en) | 1975-08-22 | 1977-10-18 | E. I. Du Pont De Nemours And Company | Process for decorating coatings produced by heat-stable polymer compositions |
GB1554300A (en) | 1975-09-05 | 1979-10-17 | Nippon Kokan Kk | Method of reducing nitrogen oxides present in an exhaust to nitrogen |
US4118225A (en) | 1975-10-28 | 1978-10-03 | Monsanto Company | Method for producing fibrous steel matts |
US4054443A (en) | 1975-12-22 | 1977-10-18 | Midrex Corporation | Method of preparing iron powder |
CH619202A5 (en) | 1976-06-17 | 1980-09-15 | Sulzer Ag | |
US4186100A (en) | 1976-12-13 | 1980-01-29 | Mott Lambert H | Inertial filter of the porous metal type |
JPS581630B2 (en) | 1977-03-12 | 1983-01-12 | 日本碍子株式会社 | Thermal shock resistant ceramic honeycomb structure |
US4179412A (en) | 1977-03-14 | 1979-12-18 | Hitachi Shipbuilding & Engineering Co., Ltd. | Process for producing catalyst precursors for decomposing ammonia by oxidation and precursors produced by said process |
CH617357A5 (en) | 1977-05-12 | 1980-05-30 | Sulzer Ag | |
US4127691A (en) | 1977-06-20 | 1978-11-28 | Corning Glass Works | Thermal shock resistant honeycomb structures |
DE2735316C3 (en) | 1977-08-05 | 1981-01-29 | Basf Ag, 6700 Ludwigshafen | Process for the production of acicular, ferrimagnetic iron oxides |
US4170497A (en) | 1977-08-24 | 1979-10-09 | The Regents Of The University Of California | High strength, tough alloy steel |
US4170499A (en) | 1977-08-24 | 1979-10-09 | The Regents Of The University Of California | Method of making high strength, tough alloy steel |
DE2805405A1 (en) | 1978-02-09 | 1979-08-16 | Basf Ag | PROCESS FOR THE PRODUCTION OF NEEDLE-SHAPED FERRIMAGNETIC IRON OXIDES |
JPS54121268A (en) | 1978-03-14 | 1979-09-20 | Tdk Corp | Manufacture of ferromagnetic metal powder |
US4162993A (en) | 1978-04-06 | 1979-07-31 | Oxy-Catalyst, Inc. | Metal catalyst support |
CH631575A5 (en) | 1978-04-28 | 1982-08-13 | Bbc Brown Boveri & Cie | METHOD FOR INCREASING THE LIFE OF A GAS DISCHARGE VESSEL. |
FI64644C (en) | 1978-05-11 | 1983-12-12 | Outokumpu Oy | FOERFARANDE FOER ROSTNING OCH KLORERING AV FINFOERDELADE JAERNMALMER OCH / ELLER -KONCENTRAT INNEHAOLLANDE ICKE-JAERNMETALLER |
US4209412A (en) | 1978-05-22 | 1980-06-24 | Hercules Incorporated | Process for producing nonstoichiometric ferroso-ferric oxides |
US4189331A (en) | 1978-06-22 | 1980-02-19 | Canada Wire And Cable Limited | Oxidation resistant barrier coated copper based substrate and method for producing the same |
US4218430A (en) | 1978-09-20 | 1980-08-19 | Nuclear Fuel Services, Inc. | Process for the production of porous metal oxide microspheres and microspheres produced by said process |
DE2902779C2 (en) | 1979-01-25 | 1985-09-26 | Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co. KG, 7000 Stuttgart | Matrix for a catalytic reactor for exhaust gas cleaning in internal combustion engines |
JPS5951336B2 (en) | 1979-03-22 | 1984-12-13 | 日本鉱業株式会社 | Catalyst for treatment of heavy hydrocarbons |
US4247422A (en) | 1979-03-26 | 1981-01-27 | Ford Motor Company | Metallic supported catalytic system and a method of making it |
US4395271A (en) | 1979-04-13 | 1983-07-26 | Corning Glass Works | Method for making porous magnetic glass and crystal-containing structures |
US4233169A (en) | 1979-04-13 | 1980-11-11 | Corning Glass Works | Porous magnetic glass structure |
DE2935444A1 (en) | 1979-09-01 | 1981-03-19 | Basf Ag, 6700 Ludwigshafen | METHOD FOR PRODUCING NEEDLE SHAPED FERRIMAGNETIC IRON OXIDE |
US4264346A (en) | 1979-12-12 | 1981-04-28 | General Motors Corporation | Diesel exhaust particulate traps |
US4295818A (en) | 1980-05-27 | 1981-10-20 | United States Of America | Catalytic monolith and method of its formulation |
JPS5742316A (en) | 1980-08-28 | 1982-03-09 | Ngk Insulators Ltd | Ceramic honeycomb filter |
US4382323A (en) | 1980-07-10 | 1983-05-10 | General Motors Corporation | Method for manufacturing a wound foil structure comprising distinct catalysts |
US4402871A (en) | 1981-01-09 | 1983-09-06 | Retallick William B | Metal catalyst support having honeycomb structure and method of making same |
US4400337A (en) | 1981-01-10 | 1983-08-23 | Hitachi Maxell, Ltd. | Method for production of metal magnetic particles |
DE3215314C2 (en) | 1982-04-23 | 1984-12-06 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München | Process for the production of oxide layers on a titanium-based alloy surface |
DE3270936D1 (en) | 1981-03-18 | 1986-06-12 | Ici Plc | Catalyst |
US4520124A (en) | 1981-03-19 | 1985-05-28 | Sakai Chemical Industry Co., Ltd. | Method for producing a catalytic structure for the reduction of nitrogen oxides |
US4448833A (en) | 1981-06-16 | 1984-05-15 | Nippondenso Co., Ltd. | Porous ceramic body and a method of manufacturing the same |
JPS5814950A (en) | 1981-07-18 | 1983-01-28 | Nippon Soken Inc | Catalyst carrier having honeycomb structure coated with activated alumina |
EP0072436B1 (en) | 1981-08-19 | 1986-10-01 | BASF Aktiengesellschaft | Process for the preparation of finely divided ferrite powder |
EP0072437B1 (en) | 1981-08-19 | 1987-01-07 | BASF Aktiengesellschaft | Process for the preparation of finely divided ferrite powder |
JPS5845714A (en) | 1981-08-20 | 1983-03-17 | Unitika Ltd | Filtering method |
US4392991A (en) | 1981-09-21 | 1983-07-12 | Westinghouse Electric Corp. | Method of making α-hematite catalyst |
US4483720A (en) | 1981-11-27 | 1984-11-20 | S R I International | Process for applying thermal barrier coatings to metals |
US4363652A (en) | 1981-12-09 | 1982-12-14 | Uop Inc. | Process for the production of high purity iron powder |
FR2532108A1 (en) | 1982-08-20 | 1984-02-24 | Videocolor Sa | PROCESS FOR PREPARING THE FERROUS PARTS OF A COLOR TELEVISION TUBE AND AN OVEN FOR CARRYING OUT SUCH A METHOD |
US4550098A (en) | 1982-11-12 | 1985-10-29 | The Boc Group, Inc. | Methods for the removal of gaseous impurities from mixed gas streams |
US4459368A (en) | 1983-01-20 | 1984-07-10 | Oil-Dri Corporation Of America | Particulate sorbing and deodorizing mixtures containing synthetic and clay sorbents |
DE3318131A1 (en) | 1983-05-18 | 1984-11-22 | Süd-Chemie AG, 8000 München | IRON OXIDE-CHROMOXIDE CATALYST FOR HIGH TEMPERATURE CO CONVERSION |
US4480051A (en) | 1983-08-03 | 1984-10-30 | E. I. Du Pont De Nemours And Company | Activated iron hydrogenation catalyst |
US4510261A (en) | 1983-10-17 | 1985-04-09 | W. R. Grace & Co. | Catalyst with high geometric surface area |
US4999336A (en) | 1983-12-13 | 1991-03-12 | Scm Metal Products, Inc. | Dispersion strengthened metal composites |
JPS60179101A (en) | 1984-02-28 | 1985-09-13 | Ngk Insulators Ltd | Porous body for contacting with fluid |
US4545974A (en) | 1984-03-16 | 1985-10-08 | Thompson John A | Process for producing alkali metal ferrates utilizing hematite and magnetite |
US4713360A (en) | 1984-03-16 | 1987-12-15 | Lanxide Technology Company, Lp | Novel ceramic materials and methods for making same |
US4698317A (en) | 1984-04-24 | 1987-10-06 | Kanto Kagaku Kabushiki Kaisha | Porous cordierite ceramics, a process for producing same and use of the porous cordierite ceramics |
US4853352A (en) | 1984-07-20 | 1989-08-01 | Lanxide Technology Company, Lp | Method of making self-supporting ceramic materials and materials made thereby |
GB8419851D0 (en) | 1984-08-03 | 1984-09-05 | Ici Plc | Catalyst production |
US4576800A (en) | 1984-09-13 | 1986-03-18 | Camet, Inc. | Catalytic converter for an automobile |
US4847225A (en) | 1984-10-05 | 1989-07-11 | W. R. Grace & Co.-Conn. | Catalysts and catalyst supports |
JPS61106728A (en) | 1984-10-31 | 1986-05-24 | Nippon Kokan Kk <Nkk> | Lump ore and its production |
JPH084749B2 (en) | 1985-01-21 | 1996-01-24 | 日本碍子株式会社 | Ceramic honeycomb structure |
US4851375A (en) | 1985-02-04 | 1989-07-25 | Lanxide Technology Company, Lp | Methods of making composite ceramic articles having embedded filler |
EP0191998A1 (en) | 1985-02-19 | 1986-08-27 | Kodak-Pathe | Process for preparing facetted nodular particles and isotropic magnetic recording elements containing such particles |
US4707184A (en) | 1985-05-31 | 1987-11-17 | Scm Metal Products, Inc. | Porous metal parts and method for making the same |
FR2583602B1 (en) | 1985-06-18 | 1988-07-01 | Centre Nat Rech Scient | INTEGRATED RETINA WITH PROCESSOR NETWORK |
DE3521766A1 (en) | 1985-06-19 | 1987-01-02 | Basf Ag | HONEYCOMB CATALYST, ITS PRODUCTION AND USE |
US4677839A (en) | 1985-08-09 | 1987-07-07 | Camet, Inc. | Apparatus for shaping a spiral catalyst support |
US4598063A (en) | 1985-08-09 | 1986-07-01 | Retallick William B | Spiral catalyst support and method of making it |
DE3531651C1 (en) | 1985-09-05 | 1987-02-19 | Didier Werke Ag | Catalytic converter in the form of a plate for nitrogen oxide reduction in exhaust gases |
US4671827A (en) | 1985-10-11 | 1987-06-09 | Advanced Materials And Design Corp. | Method of forming high-strength, tough, corrosion-resistant steel |
ATE49712T1 (en) | 1985-11-08 | 1990-02-15 | Ici Plc | BED FILLING MATERIAL. |
GB8527663D0 (en) | 1985-11-08 | 1985-12-11 | Ici Plc | Catalyst precursors |
GB8528031D0 (en) | 1985-11-13 | 1985-12-18 | Ici Plc | Ceramic structures |
DE3543858A1 (en) | 1985-12-12 | 1987-06-19 | Didier Werke Ag | METHOD FOR PRODUCING A CATALYST FOR REDUCING NITROGEN OXIDE |
JPS62142607A (en) | 1985-12-18 | 1987-06-26 | 日本碍子株式会社 | Extrusion die and manufacture thereof |
US4711009A (en) | 1986-02-18 | 1987-12-08 | W. R. Grace & Co. | Process for making metal substrate catalytic converter cores |
JPH0356354Y2 (en) | 1986-04-08 | 1991-12-18 | ||
US5017526A (en) | 1986-05-08 | 1991-05-21 | Lanxide Technology Company, Lp | Methods of making shaped ceramic composites |
DE3760479D1 (en) | 1986-05-12 | 1989-09-28 | Interatom | Honeycomb body, particularly a catalyst carrier, provided with opposedly folded metal sheet layers, and its manufacturing process |
EP0247489B1 (en) | 1986-05-28 | 1993-08-25 | Daikin Industries, Limited | Fluorine containing water and oil repellent composition |
DE3780518T2 (en) | 1986-06-12 | 1993-01-21 | Ici Plc | SINTERED MOLDED BODIES. |
DE3624934A1 (en) | 1986-07-23 | 1988-01-28 | Dynamit Nobel Ag | AT HIGH TEMPERATURES, CONSTANT CATALYST MOLDED BODIES AND METHOD FOR THE PRODUCTION THEREOF |
US4703030A (en) | 1986-07-31 | 1987-10-27 | Trustees Of Boston University | Partially reduced ferric oxide catalyst for the making of ammonia via the photoassisted reduction of molecular nitrogen and method for the preparation of the catalyst |
US5063769A (en) | 1986-09-08 | 1991-11-12 | W. R. Grace & Co.-Conn. | Metal honeycomb catalyst support having a double taper |
US4673553A (en) | 1986-09-08 | 1987-06-16 | Camet, Inc. | Metal honeycomb catalyst support having a double taper |
US4765047A (en) | 1986-09-08 | 1988-08-23 | W. R. Grace & Co.-Conn. | Method of making a metal honeycomb catalyst support having a double taper |
US4882306A (en) | 1986-09-16 | 1989-11-21 | Lanxide Technology Company, Lp | Method for producing self-supporting ceramic bodies with graded properties |
US5238886A (en) | 1986-09-16 | 1993-08-24 | Lanxide Technology Company, Lp | Surface bonding of ceramic bodies |
US4891345A (en) | 1986-09-16 | 1990-01-02 | Lanxide Technology Company, Lp | Method for producing composite ceramic structures using dross |
US5268339A (en) | 1986-09-17 | 1993-12-07 | Lanxide Technology Company, Lp | Method for in situ tailoring the component of ceramic articles |
US4780213A (en) | 1986-12-09 | 1988-10-25 | Idreco Usa Ltd. | Filter media and method of filtration |
EP0279159B2 (en) | 1987-01-19 | 1995-07-05 | Emitec Gesellschaft für Emissionstechnologie mbH | Metallic catalyst support body made of two different layers of corrugated iron |
US4869944A (en) | 1987-02-12 | 1989-09-26 | Ngk Insulators, Ltd. | Cordierite honeycomb-structural body and a method for producing the same |
JPH0634923B2 (en) | 1987-03-14 | 1994-05-11 | 日本碍子株式会社 | Ceramic honeycomb structure |
US4859433A (en) | 1987-05-18 | 1989-08-22 | W. R. Grace & Co.-Conn. | Process for treating automotive exhaust gases using monolith washcoat having optimum pore structure |
US4822660A (en) | 1987-06-02 | 1989-04-18 | Corning Glass Works | Lightweight ceramic structures and method |
US4795616A (en) | 1987-06-19 | 1989-01-03 | General Motors Corporation | Catalytic converter monolithic substrate retention |
US4849274A (en) | 1987-06-19 | 1989-07-18 | W. R. Grace & Co.-Conn. | Honeycomb fluid conduit |
DE3886108D1 (en) | 1987-07-01 | 1994-01-20 | Deutsche Aerospace | Process for producing a composite of a cermet layer and a porous metal layer on one or both sides of the cermet layer as a diaphragm with an electrode (s). |
US5082700A (en) | 1987-08-10 | 1992-01-21 | Lanxide Technology Company, Lp | Method of making ceramic composite articles and articles made thereby |
US4834808A (en) | 1987-09-08 | 1989-05-30 | Allegheny Ludlum Corporation | Producing a weldable, ferritic stainless steel strip |
US4902216A (en) | 1987-09-08 | 1990-02-20 | Corning Incorporated | Extrusion die for protrusion and/or high cell density ceramic honeycomb structures |
DE3738537A1 (en) | 1987-11-13 | 1989-06-01 | Sueddeutsche Kuehler Behr | METHOD AND DEVICE FOR PRODUCING A SUPPORT BODY FOR A CATALYTIC REACTOR |
US4782570A (en) | 1987-11-16 | 1988-11-08 | General Motors Corporation | Fabrication and assembly of metal catalytic converter catalyst substrate |
JPH0745348B2 (en) | 1988-02-10 | 1995-05-17 | 日本碍子株式会社 | Firing method of ceramic honeycomb structure |
SE463816B (en) | 1988-03-25 | 1991-01-28 | Erik Sundstroem | METHOD FOR THE PREPARATION OF THE LIQUID DIVISION BODY FOR HEAT GAS consisting of a body of ALFA corundum, and the corresponding LIQUID DIVISION BODY |
US4884960A (en) | 1988-05-06 | 1989-12-05 | Allied-Signal Inc. | Die for extruding and wash coating |
US4976929A (en) | 1988-05-20 | 1990-12-11 | W. R. Grace & Co.-Conn. | Electrically heated catalytic converter |
US5001014A (en) | 1988-05-23 | 1991-03-19 | General Electric Company | Ferrite body containing metallization |
US4882130A (en) | 1988-06-07 | 1989-11-21 | Ngk Insulators, Ltd. | Porous structure of fluid contact |
US5059489A (en) | 1988-07-15 | 1991-10-22 | Corning Incorporated | Surface modified structures |
US4979889A (en) | 1988-07-18 | 1990-12-25 | Corning Incorporated | Extrusion die for mini-monolith substrate |
US5094906A (en) | 1988-08-15 | 1992-03-10 | Exxon Research And Engineering Company | Ceramic microtubular materials and method of making same |
US5171503A (en) | 1988-08-29 | 1992-12-15 | Corning Incorporated | Method of extruding thin-walled honeycomb structures |
JP2651544B2 (en) | 1988-09-06 | 1997-09-10 | カルソニック株式会社 | Method for producing catalyst carrier |
BR8907458A (en) | 1988-09-22 | 1991-04-02 | Emitec Emissionstechnologie | ALVEOLAR BODY, ESPECIALLY CATALYST SUPPORT BODY, CONSTITUTED OF A MULTIPLICITY OF INTERLACED PLATE STACKS |
US5057482A (en) | 1988-12-15 | 1991-10-15 | Matsushita Electric Industrial Co., Ltd. | Catalytic composite for purifying exhaust gases and a method for preparing the same |
EP0377933B1 (en) | 1988-12-29 | 1995-07-19 | Toda Kogyo Corp. | Magnetic iron oxide particles and method of producing the same |
DE8900467U1 (en) | 1989-01-17 | 1990-05-17 | Emitec Emissionstechnologie | |
US5149508A (en) | 1989-03-06 | 1992-09-22 | W. R. Grace & Co.-Conn. | Parallel path catalytic converter |
US4977129A (en) | 1989-03-13 | 1990-12-11 | W. R Grace & Co.-Conn. | Auto exhaust catalyst composition having low H2 S emissions and method of making the catalyst |
US5198006A (en) | 1989-04-07 | 1993-03-30 | Asahi Glass Company, Ltd. | Ceramic filter for a dust-containing gas and method for its production |
DE69016699T2 (en) | 1989-04-28 | 1995-08-17 | Ngk Insulators Ltd | Process for the production of ferrite crystals and process for the production of preferably used ferrite powders. |
JPH0733875Y2 (en) | 1989-05-08 | 1995-08-02 | 臼井国際産業株式会社 | Exhaust gas purification device |
JP2813679B2 (en) | 1989-05-08 | 1998-10-22 | 臼井国際産業株式会社 | Exhaust gas purification device |
US5051294A (en) | 1989-05-15 | 1991-09-24 | General Motors Corporation | Catalytic converter substrate and assembly |
JP2634669B2 (en) | 1989-06-01 | 1997-07-30 | 日産自動車株式会社 | Metal honeycomb catalyst device |
US4928485A (en) | 1989-06-06 | 1990-05-29 | W. R. Grace & Co.,-Conn. | Metallic core member for catalytic converter and catalytic converter containing same |
US4985388A (en) | 1989-06-29 | 1991-01-15 | W. R. Grace & Co.-Conn. | Catalytic exhaust pipe insert |
DE8909128U1 (en) | 1989-07-27 | 1990-11-29 | Emitec Emissionstechnologie | |
US5013232A (en) | 1989-08-24 | 1991-05-07 | General Motors Corporation | Extrusion die construction |
US5118475A (en) | 1989-09-12 | 1992-06-02 | W. R. Grace & Co.-Conn. | Core element and core for electrically heatable catalytic converter |
DE3930601A1 (en) | 1989-09-13 | 1991-03-14 | Basf Ag | METHOD FOR THE PRODUCTION OF LABEL-SHAPED HEMATITE PIGMENTS |
US5342431A (en) | 1989-10-23 | 1994-08-30 | Wisconsin Alumni Research Foundation | Metal oxide membranes for gas separation |
US5269926A (en) | 1991-09-09 | 1993-12-14 | Wisconsin Alumni Research Foundation | Supported microporous ceramic membranes |
US5281462A (en) | 1989-11-01 | 1994-01-25 | Corning Incorporated | Material, structure, filter and catalytic converter |
AT400687B (en) | 1989-12-04 | 1996-02-26 | Plansee Tizit Gmbh | METHOD AND EXTRACTION TOOL FOR PRODUCING A BLANK WITH INNER BORE |
US5058381A (en) | 1990-01-24 | 1991-10-22 | General Motors Corporation | Low restriction exhaust treatment apparatus |
US5370920A (en) | 1990-04-30 | 1994-12-06 | E. I. Du Pont De Nemours And Company | Process for producing catalyst coated thermal shock resistant ceramic honeycomb structures of cordierite, mullite and corundum |
DE4110252C1 (en) | 1990-06-02 | 1992-02-27 | Schenk-Filterbau Gmbh, 7076 Waldstetten, De | |
DE4017892A1 (en) | 1990-06-02 | 1991-12-05 | Solvay Umweltchemie Gmbh | METAL FILM SUPPORT CATALYST |
US5180450A (en) | 1990-06-05 | 1993-01-19 | Ferrous Wheel Group Inc. | High performance high strength low alloy wrought steel |
DE4023404C2 (en) | 1990-07-23 | 1996-05-15 | Castolin Sa | Use of a fusible electrode |
US5089047A (en) | 1990-08-31 | 1992-02-18 | Gte Laboratories Incorporated | Ceramic-metal articles and methods of manufacture |
US5114893A (en) | 1990-11-15 | 1992-05-19 | American Colloid Company | Method of improving water-swellable clay properties by re-drying, compositions and articles |
US5174968A (en) | 1990-12-12 | 1992-12-29 | W. R. Grace & Co.-Conn. | Structure for electrically heatable catalytic core |
US5108685A (en) | 1990-12-17 | 1992-04-28 | Corning Incorporated | Method and apparatus for forming an article with multi-cellular densities and/or geometries |
JPH07133811A (en) | 1990-12-21 | 1995-05-23 | Ntn Corp | Iron/steel parts interference fit assembly body and its processing |
US5185300A (en) | 1991-03-11 | 1993-02-09 | Vesuvius Crucible Company | Erosion, thermal shock and oxidation resistant refractory compositions |
JP2768389B2 (en) | 1991-04-03 | 1998-06-25 | 中外炉工業 株式会社 | Method for blackening Ni-Fe based shadow mask |
US5170624A (en) | 1991-04-05 | 1992-12-15 | W. R. Grace & Co.-Conn. | Composite catalytic converter |
JP2500272B2 (en) | 1991-04-26 | 1996-05-29 | 日本碍子株式会社 | Method for manufacturing heat resistant alloy |
US5240682A (en) | 1991-05-06 | 1993-08-31 | W. R. Grace & Co.-Conn | Reinforced corrugated thin metal foil strip useful in a catalytic converter core, a catalytic converter core containing said strip and an electrically heatable catalytic converter containing said core |
US5214011A (en) | 1991-08-30 | 1993-05-25 | Bfd, Incorporated | Process for preparing ceramic-metal composite bodies |
GB9200434D0 (en) | 1992-01-09 | 1992-02-26 | Cavanagh Patrick E | Autogenous roasting or iron ore |
US5382558A (en) | 1992-01-13 | 1995-01-17 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Heat resistant layered porous silica and process for producing the same |
US5217939A (en) | 1992-05-11 | 1993-06-08 | Scientific Design Company, Inc. | Catalyst for the prduction of nitric acid by oxidation of ammonia |
US5242882A (en) | 1992-05-11 | 1993-09-07 | Scientific Design Company, Inc. | Catalyst for the production of nitric acid by oxidation of ammonia |
US5272876A (en) | 1992-05-20 | 1993-12-28 | W. R. Grace & Co.-Conn. | Core element for catalytic converter |
ATE146380T1 (en) | 1992-06-10 | 1997-01-15 | Siemens Ag | METHOD FOR PRODUCING A CATALYST |
USH1718H (en) * | 1992-07-20 | 1998-04-07 | The United States Of America As Represented By The Secretary Of The Navy | Method of producing high temperature superconductor wires |
US5595813A (en) | 1992-09-22 | 1997-01-21 | Takenaka Corporation | Architectural material using metal oxide exhibiting photocatalytic activity |
DE69330341T2 (en) | 1992-09-24 | 2001-09-20 | Toto Ltd | MATERIAL WITH DEPENDENT GRADIENT AND THEIR PRODUCTION |
GB9220269D0 (en) | 1992-09-25 | 1992-11-11 | Bio Separation Ltd | Separation of heavy metals from aqueous media |
FR2696947B1 (en) | 1992-10-20 | 1994-11-25 | Ceramiques Tech Soc D | Filtration, separation, gas or liquid purification, or catalytic transformation module. |
DE69302253T2 (en) | 1992-10-29 | 1996-09-19 | Babcock & Wilcox Co | Passivation of metal tubes |
US5330728A (en) | 1992-11-13 | 1994-07-19 | General Motors Corporation | Catalytic converter with angled inlet face |
JP3392895B2 (en) | 1993-01-08 | 2003-03-31 | 臼井国際産業株式会社 | X-wrap type metal honeycomb body |
US5332703A (en) | 1993-03-04 | 1994-07-26 | Corning Incorporated | Batch compositions for cordierite ceramics |
EP0615231B1 (en) | 1993-03-08 | 1997-10-15 | Ishihara Sangyo Kaisha, Ltd. | Process for producing magnetic metal particles |
US5372796A (en) | 1993-04-13 | 1994-12-13 | Southwest Research Institute | Metal oxide-polymer composites |
TW251373B (en) * | 1993-05-20 | 1995-07-11 | Fujidenki Kagaku Kk | |
DE69401031T2 (en) | 1993-06-04 | 1997-04-30 | Millipore Corp | Metal filter element with high efficiency and process for its production |
JP2870369B2 (en) | 1993-06-18 | 1999-03-17 | 住友電気工業株式会社 | Exhaust gas purification filter |
AT399887B (en) | 1993-06-21 | 1995-08-25 | Voest Alpine Ind Anlagen | METHOD FOR PRODUCING COLD-PRESSED IRON-CONTAINED BRIQUETTES |
MXPA94009540A (en) | 1993-07-30 | 2005-04-29 | Martin Marietta Energy Systems | Process for growing a film epitaxially upon an oxide surface and structures formed with the process. |
US5364586A (en) | 1993-08-17 | 1994-11-15 | Ultram International L.L.C. | Process for the production of porous membranes |
US5672427A (en) | 1993-08-31 | 1997-09-30 | Mitsubishi Materials Corporation | Zinc oxide powder having high dispersibility |
KR970009777B1 (en) | 1993-12-01 | 1997-06-18 | 엘지전자 주식회사 | Manufacture of the fluorescent layer for color cathode-ray tube |
US5490938A (en) | 1993-12-20 | 1996-02-13 | Biopolymerix, Inc. | Liquid dispenser for sterile solutions |
US5415891A (en) | 1994-01-10 | 1995-05-16 | Media And Process Technology Inc. | Method for forming metal-oxide-modified porous ceramic membranes |
US5874153A (en) | 1994-02-04 | 1999-02-23 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Zeolite-coatable metallic foil process for producing the metallic foil |
JP3287149B2 (en) | 1994-02-14 | 2002-05-27 | 松下電器産業株式会社 | Alumina ceramics |
JP3327663B2 (en) | 1994-02-23 | 2002-09-24 | 日立粉末冶金株式会社 | High temperature wear resistant sintered alloy |
US5800925A (en) | 1995-03-07 | 1998-09-01 | Agency Of Industrial Science & Technology | Nonlinear optical materials and process for producing the same |
US5458437A (en) | 1994-03-14 | 1995-10-17 | Trustees Of Princeton University | Extraction of non-ionic organic pollutants |
US5668076A (en) | 1994-04-26 | 1997-09-16 | Mitsui Mining Smelting Co., Ltd. Et Al. | Photocatalyst and method for preparing the same |
US5545264A (en) | 1994-04-26 | 1996-08-13 | Eiwa Co., Ltd. | Method of and apparatus for processing metal material |
US5518624A (en) | 1994-05-06 | 1996-05-21 | Illinois Water Treatment, Inc. | Ultra pure water filtration |
US5453108A (en) | 1994-05-18 | 1995-09-26 | A. Ahlstrom Corporation | Apparatus for filtering gases |
US5497129A (en) | 1994-06-27 | 1996-03-05 | General Motors Corporation | Filter elements having ferroelectric-ferromagnetic composite materials |
US5814164A (en) | 1994-11-09 | 1998-09-29 | American Scientific Materials Technologies L.P. | Thin-walled, monolithic iron oxide structures made from steels, and methods for manufacturing such structures |
JP2843900B2 (en) | 1995-07-07 | 1999-01-06 | 工業技術院長 | Method for producing oxide-particle-dispersed metal-based composite material |
JP2909531B2 (en) | 1995-08-30 | 1999-06-23 | 工業技術院長 | Method for synthesizing photocatalyst particles |
JPH09272815A (en) | 1996-04-02 | 1997-10-21 | Merck Japan Kk | Composite metal oxide fine particle and production of the same |
US5776264A (en) | 1996-04-12 | 1998-07-07 | Rutgers University | Method for producing amorphous based metals |
US5834057A (en) | 1996-06-28 | 1998-11-10 | The United States Is Represented By The Secretary Of The Navy | Method of making chemically engineered metastable alloys and multiple components nanoparticles |
US5800000A (en) | 1996-12-23 | 1998-09-01 | Shockley; James D. | Load adjusting device for a hoist |
JP4129602B2 (en) * | 1998-04-01 | 2008-08-06 | 古河機械金属株式会社 | Skin contact type health maintenance device and method for manufacturing the same |
-
1999
- 1999-02-17 US US09/251,348 patent/US6461562B1/en not_active Expired - Fee Related
-
2002
- 2002-08-21 US US10/224,691 patent/US20030001320A1/en not_active Abandoned
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