US3871877A - Producing aluminum powder compacts - Google Patents
Producing aluminum powder compacts Download PDFInfo
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- US3871877A US3871877A US053289A US5328970A US3871877A US 3871877 A US3871877 A US 3871877A US 053289 A US053289 A US 053289A US 5328970 A US5328970 A US 5328970A US 3871877 A US3871877 A US 3871877A
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- Prior art keywords
- powder
- metal
- aluminum
- particles
- die
- Prior art date
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 42
- -1 polysiloxane Polymers 0.000 claims abstract description 23
- 229920001296 polysiloxane Polymers 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000002923 metal particle Substances 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- WCYWZMWISLQXQU-UHFFFAOYSA-N methyl Chemical class [CH3] WCYWZMWISLQXQU-UHFFFAOYSA-N 0.000 claims 3
- 150000003254 radicals Chemical class 0.000 claims 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 239000004610 Internal Lubricant Substances 0.000 abstract description 7
- 239000000314 lubricant Substances 0.000 description 17
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 2
- 239000000344 soap Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- VQLYBLABXAHUDN-UHFFFAOYSA-N bis(4-fluorophenyl)-methyl-(1,2,4-triazol-1-ylmethyl)silane;methyl n-(1h-benzimidazol-2-yl)carbamate Chemical compound C1=CC=C2NC(NC(=O)OC)=NC2=C1.C=1C=C(F)C=CC=1[Si](C=1C=CC(F)=CC=1)(C)CN1C=NC=N1 VQLYBLABXAHUDN-UHFFFAOYSA-N 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0408—Light metal alloys
- C22C1/0416—Aluminium-based alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F2003/026—Mold wall lubrication or article surface lubrication
Definitions
- ABSTRACT High density aluminum metal powder compacts are produced without the use of internal lubricants by coating the compacting die walls with a methyl alkyl polysiloxane prior to charging the powder into the die.
- This invention relates to the art of powder metallurgy of aluminum and, more particularly, to the production of aluminum powder compacts for sintering.
- a lubricant such as a wax or a stearate-type soap, or the like
- Such lubricants are customarily used in amounts of about one-half to 3 percent by weight of the metal powder, increasing amounts being used to achieve higher densities, but because of the presence of these lubricants in the compacted powder the compact generally has a green strength of only about 1,500 p.s.i.
- the sintered compact exhibits far less strength and ductility than is expected of it, the strength and ductility both decreasing with increasing amount of lubricant.
- the art has resorted to lubrication of the compacting die walls. In the latter case, the lubricant is generally applied in a solvent, and the time required for complete evaporation of the solvent has slowed commercial production rates to an uneconomical level. Any liquid left in the lubricant on the die walls when the powder is added permits the lubricant surface to break down during compaction with resulting scoring of the die walls.
- the method of producing aluminum metal powder compacts pursuant to the present invention comprises forming a bulk mixture of the metal powder in which the particles are in direct metal-to-metal contact, applying to the walls of a powder-compacting die a coating of a normally liquid methyl alkyl polysiloxane having a molecular weight between about 1,500 and 10,000, then filling the thus-wetted die with said powder, and compacting the powder in said die.
- the method of the invention is applicable to predominantly aluminum powders the particles of which can be of virtually any size, size distribution and shape.
- the metal powder can be in excess of 100 mesh Tyler Standard or it can be at least 90 percent minus 325 mesh, or mixtures thereof, and the particles can range in shape from chips to needles to spheres.
- the aluminum powder, together with any other metal powder which it may be desired to combine with the aluminum, is prepared for compacting with only a single precaution, to wit, the non-use of an internal lubricant.
- a lubricant would preclude a metal-tometal market as Alcoa No. 1220 aluminum powder), without contact and interface between the particles of the powder.
- Such contact between the particles is essential to maximum green and sintered strength and it is a feature of the present invention that any material which would interfere with such a contact is avoided.
- the compacting die wall lubricant which makes possible the production of high density green compacts without an internal lubricant or the like comprises normally liquid methyl alkyl polysiloxanes having molecular weights ranging from about 1,500 to 10,000.
- the alkyl groups in these polysiloxanes include ethyl, propyl, butyl, amyl, hexyl, octyl, decyl, dodecyl and tetradecyl radicals which form long chains of polysiloxanes having linear organic radicals ranging from 1 to 40 carbons in length.
- the thus-wetted die is filled .with sufficient metal powder to form the desired green compact.
- the powder is then compacted using sufficient pressure to obtain the desired green density in the compact.
- the resulting green compact will be characterized, for example, by a strength of at least 5,000 p.s.i. at 93 percent theoretical density, and can be handled roughly, as with a mechanical die ejector, without danger of breakage of any sort.
- a relatively coarse, commercially pure aluminum powder having a particle size of about 10 percent through 325 mesh Tyler Standard (purchased on the any additive and thus free from any internal lubricant, was charged to a die which had been previously spraycoated with a normally liquid methyl alkyl polysiloxane lubricant purchased on the market as General Electrics Silicone Oil No. SF 1147.
- the die was designed to produce a timing cover of generally dome shape 2% inches in diameter and one-eighth inch thick.
- the shape further had a peripheral flange one-sixteenth inch thick, an angled section and a truncated coneshaped hub.
- the die was mounted in a conventional two-motion press.
- a process for producing a high density aluminum powder compact capable of being sintered comprising:
- step (b) c. charging the mixture of aluminum metal powder particles formed in step (a) to the powder compacting die whose walls have been treated with the methyl alkyl polysiloxane according to step (b);
- step (c) compacting the aluminum metal powder particles charged to the powder compacting die in step (c) under pressure to form a green compact having a strength of at least about 5,000 p.s.i. at 93 percent theoretical density;
- step (d) e. sintering the green compact formed in step (d).
- a process for producing a high density aluminum powder compact capable of being sintered comprising:
- step (b) c. charging the mixture of aluminum metal powder particles formed in step (a) to the powder compacting die whose walls have been treated with the methyl alkyl polysiloxane according to step (b);
- step (c) compacting the aluminum metal powder particles charged to the powder compacting die in step (c) under pressure to form a green compact having a strength of at least about 5,000 p.s.i. at 93 percent theoretical density.
Abstract
High density aluminum metal powder compacts are produced without the use of internal lubricants by coating the compacting die walls with a methyl alkyl polysiloxane prior to charging the powder into the die.
Description
United States Patent Storchheim 5] Mar. 18, 1975 54] PRODUCING ALUMINUM POWDER 3,406,236 10/1968 Kniege 264/338 3,478,136 11/1969 Buchovecky et al. 264/111 COMPACTS [75] Inventor: Samuel Storchheim, Forest Hills,
[73] Assignee: Sinteral Corporation, Jamaica, NY.
[22] Filed: July 8, 1970 [2|] Appl. N0.: 53,289
[52] US. Cl. 75/214, 264/111 [5 l] Int. Cl B22l' 3/12 [58] Field of Search 264/111, 39, 338; ll7/5.l, ll7/5.2, 5.3; 75/214 [56] References Cited UNITED STATES PATENTS 3,l32.379 5/1964 Crane 425/DlG. 115
Primary Examiner-D0nald J. Arnold Assistant E.\'aminerJ. R. Hall Attorney, Agent, or Firm-Pennie & Edmonds [57] ABSTRACT High density aluminum metal powder compacts are produced without the use of internal lubricants by coating the compacting die walls with a methyl alkyl polysiloxane prior to charging the powder into the die.
2 Claims, N0 Drawings PRODUCING ALUMINUM POWDER COMPACTS This invention relates to the art of powder metallurgy of aluminum and, more particularly, to the production of aluminum powder compacts for sintering.
In the compacting of aluminum powders preparatory to sintering, it is common practice to admix with the powder a lubricant such as a wax or a stearate-type soap, or the like, to facilitate compaction. When such a lubricant is used, it must be volatilized and removed as completely as possible during heating-up to sintering temperature so as not to interfere with the sintering bond. Such lubricants are customarily used in amounts of about one-half to 3 percent by weight of the metal powder, increasing amounts being used to achieve higher densities, but because of the presence of these lubricants in the compacted powder the compact generally has a green strength of only about 1,500 p.s.i. and the sintered compact exhibits far less strength and ductility than is expected of it, the strength and ductility both decreasing with increasing amount of lubricant. In order to eliminate the need for such internal lubricants, the art has resorted to lubrication of the compacting die walls. In the latter case, the lubricant is generally applied in a solvent, and the time required for complete evaporation of the solvent has slowed commercial production rates to an uneconomical level. Any liquid left in the lubricant on the die walls when the powder is added permits the lubricant surface to break down during compaction with resulting scoring of the die walls. Consequently all die lubricants used heretofore for this purpose, including hydrocarbon oils, waxes and soaps, have not made possible commercialrate production of satisfactory and uniform green compacts of high density without scoring of the die walls or of the surfaces of the compacts. This has placed an upper limit on the permissible compacting pressure with the result that the green compacts often lack the strength to be mechanically ejected from the compacting die in commercial scale operation and are generally characterized by internal voids or laminations, caused at least in part by volatilization of the lubricant, which lead to mechanical failure of the sintered part.
I have now discovered that a specific class of polysiloxane lubricants, when used as a die wall lubricant, makes possible the compaction of aluminum powders without using internal lubricants in the powder. The method of producing aluminum metal powder compacts pursuant to the present invention comprises forming a bulk mixture of the metal powder in which the particles are in direct metal-to-metal contact, applying to the walls of a powder-compacting die a coating of a normally liquid methyl alkyl polysiloxane having a molecular weight between about 1,500 and 10,000, then filling the thus-wetted die with said powder, and compacting the powder in said die.
The method of the invention is applicable to predominantly aluminum powders the particles of which can be of virtually any size, size distribution and shape. Thus, the metal powder can be in excess of 100 mesh Tyler Standard or it can be at least 90 percent minus 325 mesh, or mixtures thereof, and the particles can range in shape from chips to needles to spheres.
The aluminum powder, together with any other metal powder which it may be desired to combine with the aluminum, is prepared for compacting with only a single precaution, to wit, the non-use of an internal lubricant. Such a lubricant would preclude a metal-tometal market as Alcoa No. 1220 aluminum powder), without contact and interface between the particles of the powder. Such contact between the particles is essential to maximum green and sintered strength and it is a feature of the present invention that any material which would interfere with such a contact is avoided.
The compacting die wall lubricant which makes possible the production of high density green compacts without an internal lubricant or the like comprises normally liquid methyl alkyl polysiloxanes having molecular weights ranging from about 1,500 to 10,000. The alkyl groups in these polysiloxanes include ethyl, propyl, butyl, amyl, hexyl, octyl, decyl, dodecyl and tetradecyl radicals which form long chains of polysiloxanes having linear organic radicals ranging from 1 to 40 carbons in length. A full description of these polysiloxanes appears in The TransActions of the American Society of Lubrication Engineers, Volume 9, pages 31-35 (1966), in an article by E. D. Brown, Jr., entitled Methyl Alkyl Silicones, A New Class of Lubricants.
After the die walls have been coated with the aforementioned lubricant, either by brushing or spraying, or
the like, the thus-wetted die is filled .with sufficient metal powder to form the desired green compact. The powder is then compacted using sufficient pressure to obtain the desired green density in the compact. The resulting green compact will be characterized, for example, by a strength of at least 5,000 p.s.i. at 93 percent theoretical density, and can be handled roughly, as with a mechanical die ejector, without danger of breakage of any sort.
The following specific example is illustrative but not limitative of the practice of the invention:
A relatively coarse, commercially pure aluminum powder having a particle size of about 10 percent through 325 mesh Tyler Standard (purchased on the any additive and thus free from any internal lubricant, was charged to a die which had been previously spraycoated with a normally liquid methyl alkyl polysiloxane lubricant purchased on the market as General Electrics Silicone Oil No. SF 1147. The die was designed to produce a timing cover of generally dome shape 2% inches in diameter and one-eighth inch thick. The shape further had a peripheral flange one-sixteenth inch thick, an angled section and a truncated coneshaped hub. The die was mounted in a conventional two-motion press. Several hundred such shapes were produced in this manner, each having about 90 percent theoretical density at the flanged area, about 85 percent theoretical density in the dome-shaped portion and about percent theoretical density in the truncated cone section. No scoring of the die or of the compacts was observable, and no die-wall erosion or aluminum build-up on the die walls could be detected. The green compacts could not be broken by hand strength, and none of them broke during mechanical ejection from the green press mold.
The resulting compacts, carried in carbon steel boats, were sintered in a hydrogen atmosphere with a heat-up rate of 40C. per minute to an ultimate sintering temperature of about 1,180F. The sintered parts readily fitted back into the green-press die with only about 1 percent shrinkage, and were then coined to higher density, strength and lustre.
I claim:
1. A process for producing a high density aluminum powder compact capable of being sintered, said process comprising:
a. forming a bulk metal particle mixture containing predominantly aluminum metal powder particles wherein the metal particles are in direct metal-tometal contact, said particles ranging in shape from chips to needles to spheres;
b. applying to the walls of a powder compacting die a coating of a normally liquid methyl alkyl polysiloxane having a molecular weight of between about 1500 and about 10,000, the alkyl radicals in said methyl alkyl polysiloxane being selected from the group consisting of linear alkyl radicals ranging from one to 40 carbon atoms in length:
c. charging the mixture of aluminum metal powder particles formed in step (a) to the powder compacting die whose walls have been treated with the methyl alkyl polysiloxane according to step (b);
d. compacting the aluminum metal powder particles charged to the powder compacting die in step (c) under pressure to form a green compact having a strength of at least about 5,000 p.s.i. at 93 percent theoretical density; and
e. sintering the green compact formed in step (d).
2. A process for producing a high density aluminum powder compact capable of being sintered, said process comprising:
a. forming a bulk metal particle mixture containing predominantly aluminum metal powder particles wherein the metal particles are in direct metal-tometal contact;
b. applying to the walls of a powder compacting die a coating of a normally liquid methyl alkyl polysiloxane having a molecular weight of between about 1,500 and about 10,000, the alkyl radicals in said methyl alkyl polysiloxane being selected from the group consisting of linear alkyl radicals ranging from one to 40 carbon atoms in length;
c. charging the mixture of aluminum metal powder particles formed in step (a) to the powder compacting die whose walls have been treated with the methyl alkyl polysiloxane according to step (b); and
d. compacting the aluminum metal powder particles charged to the powder compacting die in step (c) under pressure to form a green compact having a strength of at least about 5,000 p.s.i. at 93 percent theoretical density.
Claims (2)
1. A PROCESS FOR PRODUCING A HIGH DENSITY ALUMINUM POWDER COMPACT CAPABLE OF BEING SINTERED, SAID PROCESS COMPRISING: A. FORMING A BULK METAL PARTICLE MIXTURE CONTAINING PREDOMINANTLY ALUMINUM METAL POWDER PARTICLES WHEREIN THE METAL PARTICLES ARE IN DIRECT METAL-TO-METAL CONTACT, SAID PARTICLES RANGING IN SHAPE FROM CHIPS TO NEEDLES TO SPHERES, B. APPLYING TO THE WALLS OF A POWDER COMPACTING DIE A COATING OF A NORMALLY LIQUID METHYL ALKYL POLYSILOXANE HAVING A MOLECULAR WEIGHT OF BETWEEN ABOUT 1500 AND ABOUT 10.000, THE ALKYL RADICALS IN SAID METHYL ALKYL POLYSILOXANE BEING SELETED ONE THE GROUP CONSISTING OF LINEAR ALKYL RADICALS RANGING FROM TO 40 CARBON ATOMS IN LENGTH, C. CHARGING THE MIXTURE OF ALUMINUM METAL POWDER PARTICLES FORMED IN STEP (A) TO THE POWDER COMPACTING DIE WHOSE WALLS HAVE BEEN TREATED WITH THE METHYL ALKYL POLYSILOXANE ACCORDING TO STEP (B), D. COMPACTING THE ALUMINUM METAL POWDER PARTICLES CHARGED TO THE POWDER COMPACTING DIE IN STEP (C) UNDER PRESSURE TO FORM A GREEN COMPACT HAVING A STRENGTH OF AT LEAST ABOUT 5,000 P.S.I. AT 93 PERCENT THEORETICAL DENSITY, AND E. SINTERING THE GREEN COMPACT FORMED IN STEP (D).
2. A process for producing a high density aluminum powder compact capable of being sintered, said process comprising: a. forming a bulk metal particle mixture containing predominantly aluminum metal powder particles wherein the metal particles are in direct metal-to-metal contact; b. applying to the walls of a powder compacting die a coating of a normally liquid methyl alkyl polysiloxane having a molecular weight of between about 1,500 and about 10,000, the alkyl radicals in said methyl alkyl polysiloxane being selected from the group consisting of linear alkyl radicals ranging from one to 40 carbon atoms in length; c. charging the mixture of aluminum metal powder particles formed in step (a) to the powder compacting die whose walls have been treated with the methyl alkyl polysiloxane according to step (b); and d. compacting the aluminum metal powder particles charged to the powder compacting die in step (c) under pressure to form a green compact having a strength of at least about 5,000 p.s.i. at 93 percent theoretical density.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US053289A US3871877A (en) | 1970-07-08 | 1970-07-08 | Producing aluminum powder compacts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US053289A US3871877A (en) | 1970-07-08 | 1970-07-08 | Producing aluminum powder compacts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3871877A true US3871877A (en) | 1975-03-18 |
Family
ID=21983186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US053289A Expired - Lifetime US3871877A (en) | 1970-07-08 | 1970-07-08 | Producing aluminum powder compacts |
Country Status (1)
| Country | Link |
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| US (1) | US3871877A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4208209A (en) * | 1978-03-08 | 1980-06-17 | Kamil Sor | Process for cold pressing finely ground metals |
| US5304343A (en) * | 1989-12-29 | 1994-04-19 | Showa Denko K.K. | Aluminum-alloy powder, sintered aluminum-alloy, and method for producing the sintered aluminum-alloy |
| US5344605A (en) * | 1991-11-22 | 1994-09-06 | Sumitomo Electric Industries, Ltd. | Method of degassing and solidifying an aluminum alloy powder |
| EP0698435A1 (en) * | 1994-08-24 | 1996-02-28 | Quebec Metal Powders Ltd. | Powder metallurgy apparatus and process using electrostatic die wall lubrication |
| US5682591A (en) * | 1994-08-24 | 1997-10-28 | Quebec Metal Powders Limited | Powder metallurgy apparatus and process using electrostatic die wall lubrication |
| US6190605B1 (en) * | 1997-04-09 | 2001-02-20 | Zenith Sintered Products, Inc. | Dry die wall lubrication |
| US20040013558A1 (en) * | 2002-07-17 | 2004-01-22 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Green compact and process for compacting the same, metallic sintered body and process for producing the same, worked component part and method of working |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3132379A (en) * | 1961-04-12 | 1964-05-12 | Bliss E W Co | Compacting press |
| US3406236A (en) * | 1964-01-15 | 1968-10-15 | Bayer Ag | Method of molding articles utilizing mold coated with release agent comprising polysiloxane-polyoxyalkylene mixture |
| US3478136A (en) * | 1967-05-25 | 1969-11-11 | Du Pont | Process for roll-compacting of metal powder with flange lubrication |
-
1970
- 1970-07-08 US US053289A patent/US3871877A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3132379A (en) * | 1961-04-12 | 1964-05-12 | Bliss E W Co | Compacting press |
| US3406236A (en) * | 1964-01-15 | 1968-10-15 | Bayer Ag | Method of molding articles utilizing mold coated with release agent comprising polysiloxane-polyoxyalkylene mixture |
| US3478136A (en) * | 1967-05-25 | 1969-11-11 | Du Pont | Process for roll-compacting of metal powder with flange lubrication |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4208209A (en) * | 1978-03-08 | 1980-06-17 | Kamil Sor | Process for cold pressing finely ground metals |
| US5304343A (en) * | 1989-12-29 | 1994-04-19 | Showa Denko K.K. | Aluminum-alloy powder, sintered aluminum-alloy, and method for producing the sintered aluminum-alloy |
| US5344605A (en) * | 1991-11-22 | 1994-09-06 | Sumitomo Electric Industries, Ltd. | Method of degassing and solidifying an aluminum alloy powder |
| EP0698435A1 (en) * | 1994-08-24 | 1996-02-28 | Quebec Metal Powders Ltd. | Powder metallurgy apparatus and process using electrostatic die wall lubrication |
| JPH08100203A (en) * | 1994-08-24 | 1996-04-16 | Quebec Metal Powders Ltd | Apparatus and method for powder metallurgy using electrostatic die wall lubrication |
| US5682591A (en) * | 1994-08-24 | 1997-10-28 | Quebec Metal Powders Limited | Powder metallurgy apparatus and process using electrostatic die wall lubrication |
| JP3383731B2 (en) | 1994-08-24 | 2003-03-04 | ケベック メタル パウダーズ リミテッド | Powder metallurgy apparatus and method using electrostatic die wall lubrication |
| US6190605B1 (en) * | 1997-04-09 | 2001-02-20 | Zenith Sintered Products, Inc. | Dry die wall lubrication |
| US20040013558A1 (en) * | 2002-07-17 | 2004-01-22 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Green compact and process for compacting the same, metallic sintered body and process for producing the same, worked component part and method of working |
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