WO2007004394A1 - 高純度錫又は錫合金及び高純度錫の製造方法 - Google Patents
高純度錫又は錫合金及び高純度錫の製造方法 Download PDFInfo
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- WO2007004394A1 WO2007004394A1 PCT/JP2006/311912 JP2006311912W WO2007004394A1 WO 2007004394 A1 WO2007004394 A1 WO 2007004394A1 JP 2006311912 W JP2006311912 W JP 2006311912W WO 2007004394 A1 WO2007004394 A1 WO 2007004394A1
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 118
- 229910001128 Sn alloy Inorganic materials 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title abstract description 10
- 229910052718 tin Inorganic materials 0.000 claims abstract description 100
- 229910052776 Thorium Inorganic materials 0.000 claims abstract description 34
- 229910052770 Uranium Inorganic materials 0.000 claims abstract description 31
- 229910052745 lead Inorganic materials 0.000 claims abstract description 30
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 28
- 230000005260 alpha ray Effects 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 28
- 239000002994 raw material Substances 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 238000000746 purification Methods 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 13
- 239000008151 electrolyte solution Substances 0.000 claims description 11
- 238000002386 leaching Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 239000003463 adsorbent Substances 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 39
- 239000004065 semiconductor Substances 0.000 abstract description 39
- 229910000679 solder Inorganic materials 0.000 abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 230000005855 radiation Effects 0.000 description 37
- 239000002245 particle Substances 0.000 description 27
- 238000005868 electrolysis reaction Methods 0.000 description 24
- 230000002285 radioactive effect Effects 0.000 description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 14
- 239000012298 atmosphere Substances 0.000 description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 12
- 239000000956 alloy Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 9
- 230000007423 decrease Effects 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000000654 additive Substances 0.000 description 8
- 230000000996 additive effect Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052709 silver Inorganic materials 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 7
- 239000003792 electrolyte Substances 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000010949 copper Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 229910052713 technetium Inorganic materials 0.000 description 5
- GKLVYJBZJHMRIY-UHFFFAOYSA-N technetium atom Chemical compound [Tc] GKLVYJBZJHMRIY-UHFFFAOYSA-N 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 4
- 229910001887 tin oxide Inorganic materials 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 229910017770 Cu—Ag Inorganic materials 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 229910020836 Sn-Ag Inorganic materials 0.000 description 2
- 229910020994 Sn-Zn Inorganic materials 0.000 description 2
- 229910020988 Sn—Ag Inorganic materials 0.000 description 2
- 229910009069 Sn—Zn Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- AUYOHNUMSAGWQZ-UHFFFAOYSA-L dihydroxy(oxo)tin Chemical compound O[Sn](O)=O AUYOHNUMSAGWQZ-UHFFFAOYSA-L 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 229910020816 Sn Pb Inorganic materials 0.000 description 1
- 229910020922 Sn-Pb Inorganic materials 0.000 description 1
- 229910008783 Sn—Pb Inorganic materials 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- LBDSXVIYZYSRII-IGMARMGPSA-N alpha-particle Chemical compound [4He+2] LBDSXVIYZYSRII-IGMARMGPSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229910052699 polonium Inorganic materials 0.000 description 1
- HZEBHPIOVYHPMT-UHFFFAOYSA-N polonium atom Chemical compound [Po] HZEBHPIOVYHPMT-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 229910052704 radon Inorganic materials 0.000 description 1
- SYUHGPGVQRZVTB-UHFFFAOYSA-N radon atom Chemical group [Rn] SYUHGPGVQRZVTB-UHFFFAOYSA-N 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B25/00—Obtaining tin
- C22B25/04—Obtaining tin by wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B25/00—Obtaining tin
- C22B25/08—Refining
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C13/00—Alloys based on tin
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/14—Electrolytic production, recovery or refining of metals by electrolysis of solutions of tin
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B13/00—Obtaining lead
- C22B13/06—Refining
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/12—Structure, shape, material or disposition of the bump connectors prior to the connecting process
- H01L2224/13—Structure, shape, material or disposition of the bump connectors prior to the connecting process of an individual bump connector
- H01L2224/13001—Core members of the bump connector
- H01L2224/13099—Material
- H01L2224/131—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/13101—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of less than 400°C
- H01L2224/13111—Tin [Sn] as principal constituent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/482—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of lead-in layers inseparably applied to the semiconductor body
- H01L23/4827—Materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00011—Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/102—Material of the semiconductor or solid state bodies
- H01L2924/1025—Semiconducting materials
- H01L2924/10251—Elemental semiconductors, i.e. Group IV
- H01L2924/10253—Silicon [Si]
Definitions
- the present invention relates to a high purity tin or tin alloy with a reduced tin exposure dose used for manufacturing a semiconductor manufacturing apparatus or the like and a method for manufacturing high purity tin.
- tin is a material used for manufacturing semiconductors, and is a main raw material for solder materials.
- Patent Document 1 after the dose shed and tin alloyed with m 2 or less of lead N 10 cph, describes a process for preparing low specific line tin performing Sei ⁇ to remove free Murrell lead tin les RU
- Patent Document 2 when a material selected from Na, Sr, K, Cr, Nb, Mn, V, Ta, Si, Zr, and Ba is added to Sn-Pb alloy solder at 10 to 5000 ppm, count ⁇ particles is described that drops 111 2 below N 0.5Cph. However, the addition of such materials has reduced the radiation alpha particle count to the level of 0.015 cph m 2 , which has not reached the level expected for today's semiconductor device materials.
- a further problem is that elements that are undesirable when mixed in semiconductors, such as alkali metal elements, transition metal elements, and heavy metal elements, are used as materials to be added. Therefore, it must be said that it is a low-level material for assembling semiconductor devices.
- Patent Document 4 lead concentration is low by electrolysis using sulfuric acid and hydrochloric acid with high purity such as special grade sulfuric acid and special grade hydrochloric acid, and using high purity tin as anode.
- ⁇ ray count is described to obtain a m 2 or less of a high-purity tin N 0.005Cph. It is natural that high-purity materials can be obtained by using high-purity raw materials (reagents) without considering the cost, but the lowest of the deposited tin shown in the example of Patent Document 4 is still the lowest. There ⁇ ray count is 0.002cp cm 2, the high cost of the split, does not reach the level that can be expected.
- Patent Document 5 nitric acid is added to a heated aqueous solution to which crude metallic tin is added to precipitate metastannic acid, which is filtered and washed. The washed metastannic acid is converted to hydrochloric acid or hydrofluoric acid. And a method of obtaining metal tin of 5N or more by electrolytic collection using the dissolved solution as an electrolytic solution is described.
- the technology states that this technology can be applied to vague semiconductor devices. There is no particular mention of the limits on the counts of radioactive elements U, Th, and radiation particles. It can be said that the level of interest is low.
- Patent Document 6 discloses a technique in which the amount of Pb contained in Sn constituting a solder alloy is reduced, and Bi, Sb, Ag, or Zn is used as an alloy material. However, in this case, even if Pb is reduced as much as possible, there is no specific means for fundamentally solving the problem of the count of radiation particles caused by the inevitable Pb.
- Patent Document 7 the quality produced by electrolysis using a special grade sulfuric acid reagent is 99.99% or less.
- tin whose radiation ⁇ particle count is 0.03 cpcm 2 or less is disclosed.
- the lowest wire count is 0.003 cph m 2 , and even though the cost is high, it has reached the expected level.
- Patent Document 8 describes lead for brazing filler metals for semiconductor devices, having a grade of 4 nines or more, a radioisotope of less than 50 ppm, and a radiation particle count of 0.5 cph m 2 or less.
- Patent Document 9 describes tin for brazing materials for semiconductor devices, having a grade of 99.95% or more, a radioisotope of less than 30 ppm, and a radiation particle count of 0.2 cph m 2 or less. Yes.
- Cited Document 10 shows an example of Sn with a purity power of 3 ⁇ 49.999% (5%). This is used for metal plug materials for seismic isolation structures, which are radioactive elements U, Th and Such a material that is not described at all for the limitation on the number of counts of radiation ⁇ particles cannot be used as a semiconductor device assembly material.
- Cited Document 11 discloses a method of removing technetium with graphite or activated carbon powder from nickel contaminated with a large amount of technetium (Tc), uranium and thorium.
- Tc technetium
- uranium uranium
- thorium a large amount of technetium
- the reason for this is that if technetium is removed by electrolytic refining, it follows nickel and eutectoids into a force sword, so it cannot be separated.
- technetium which is a radioactive substance contained in Nikkenole, cannot be removed by electrolytic purification.
- the technology of reference 11 is a problem specific to nickel contaminated with technetium and is not applicable to other substances.
- this technology is only a low-level technology for the purification of industrial waste that is harmful to the human body, reaching the level as a material for semiconductor devices.
- Patent Document 1 Japanese Patent No. 3528532
- Patent Document 2 Japanese Patent No. 3227851
- Patent Document 3 Japanese Patent No. 2913908
- Patent Document 4 Japanese Patent No. 2754030
- Patent Document 5 Japanese Patent Laid-Open No. 11-343590
- Patent Document 6 JP-A-9-260427
- Patent Document 7 Japanese Patent Laid-Open No. 1-283398
- Patent Document 8 JP-A 62-47955
- Patent Document 9 Japanese Patent Laid-Open No. 62-1478
- Patent Document 10 Japanese Patent Laid-Open No. 2001-82538
- Patent Document 11 JP-A-7-280998
- the high-purity tin or tin alloy of the present invention has a purity of 5N or more (except for gas components of 0, C, N, H, S, and P), Among them, the contents of each of the radioactive elements U and Th are 5 ppb or less, and the contents of Pb and Bi that emit radiation particles are 1 ppm or less, respectively. This is to eliminate the effects of. (Note that%, ppm, and ppb used in the present invention all indicate weight (wt).) The high-purity tin or tin alloy of the present invention is finally melted and forged and optionally rolled and cut.
- the high-purity tin or tin alloy according to the present invention which is manufactured in the present invention and desirably has a strand count of the high-purity tin of O.OOlcph m 2 or less, realizes this.
- tin as a raw material is leached with an acid, for example, sulfuric acid, and then the leached solution is used as an electrolytic solution.
- the adsorbent of impurities is suspended in the electrolytic solution, and the raw material Sn anode is used for electrolytic purification, so that the purity is 5N or more (however, 0, C, N, H, S, Among them, the contents of each of the radioactive elements U and Th are 5 ppb or less, and the contents of Pb and Bi that emit radioactive particles are 1 ppm or less. Obtain pure tin.
- oxides such as titanium oxide, aluminum oxide and tin oxide, activated carbon, carbon and the like can be used.
- the high-purity tin obtained by the above-described electrolytic refining was melt-cast at 250 to 500 ° C, and the strand count after 6 months or more of this forged ingot was calculated as O.Olcph m 2 The following.
- Sn fabrication there is radon uptake and polonium evaporation, making it difficult to accurately measure actual impurities and alpha dose in Sn. Therefore, it is necessary to have more than 6 months to stabilize it.
- the ⁇ -ray count number power is stabilized to less than SO.OOlcph m 2 after 6 months or more.
- additive components for high-purity tin alloys include silver, copper, and zinc, but these elements are not particularly limited. Also, the usual addition amount is 0.1-20 wt%, but there is no limit to this amount. Similarly, it is necessary to use high purity materials.
- the high-purity tin or tin alloy of the present invention has a purity of 5N or more (excluding gas components of ⁇ , C, N, H, S, and P), and among these, radioactive elements U, Th
- Each content of Pb and Bi, which emits radiation particles, is less than 1 ppm, and the influence of the wires on the semiconductor chip can be eliminated as much as possible.
- the high-purity tin or tin alloy of the present invention is finally produced by melt forging, and the alpha ray count of high-purity tin having the tin forging structure is O.OOlcph m 2. It has the outstanding effect that it can be made below. This can significantly reduce the occurrence of soft errors due to the effects of ⁇ rays on the semiconductor device.
- the raw material tin As the raw material tin, commercially available tin of 2 to 3N level is usually used. However, the raw material tin need not be limited to such commercially available products. This raw material tin is leached with acid, and this leachate is used as an electrolyte. As the acid to be used, hydrochloric acid, sulfuric acid and the like are preferable.
- the anode uses 2-4N level Sn.
- electrolysis is performed under conditions of an electrolysis temperature of 10 to 80 ° C. and a current density of 0.1 to 50 A / dm 2 .
- Oxides such as titanium oxide, aluminum oxide, and tin oxide, activated carbon, and carbon are suspended in the electrolytic solution to adsorb impurities. This is particularly effective for removing Pb and Bi.
- the deposited electrolytic tin is melt-cast under conditions of 250 to 500 ° C. to obtain a tin ingot.
- This temperature range is effective for removing radioactive elements such as Po. It is difficult to forge just above the melting point below 250 ° C. Above 500 ° C, Sn is evaporated, which is not preferable. Therefore, it melts and forges in the above temperature range.
- the forged tin ingot was stored for 6 months in an inert gas atmosphere or under vacuum. Examining the radiation dose after the lapse of 6 months, the number of wire counts decreases, and it becomes possible to make it less than O.OOlcph m 2 .
- tin alloys especially when the contents of the additive elements are the contents of each of the radioactive elements U and Th, the contents of Pb and Bi that emit radiation particles, and tin alloys.
- a high-purity material that satisfies the conditions of the present invention is selected and alloyed.
- the manufacturing process is the same as that for manufacturing the tin ingot.
- the high-purity tin or tin alloy of the present invention thus obtained has an excellent effect that the occurrence of soft errors due to the influence of the wire of the semiconductor device can be remarkably reduced.
- Raw material tin was leached with sulfuric acid, and this leaching solution was used as an electrolyte.
- 3N level Sn was used for the anode. This was electrolyzed under the conditions of an electrolysis temperature of 20 ° C. and a current density of lA / dm 2 .
- Table 1 shows the analytical values of the raw material tin.
- the electrolyte 50 g / L of titanium oxide (TiO) was added and suspended.
- TiO titanium oxide
- the Pb content was 0.7 ppm and the Bi content was O. lppm.
- the content of each of U and Th was 5 ppb. In this way, the amount of Pb, Bi, U, and Th were reduced because the impurities Pb and Bi were reduced by adsorption to suspended titanium oxide, and impurities U, The decrease in Th is due to electrolysis.
- the deposited electrolytic tin was melted and fabricated at a temperature of 260 ° C. to obtain a tin ingot.
- the forged tin ingot was stored for 6 months in an argon gas atmosphere.
- the ⁇ -ray count was 0.0007 cph m 2 .
- the analytical values of tin after purification are also shown in Table 1.
- Raw material tin was leached with sulfuric acid, and this leaching solution was used as an electrolyte.
- the same 3N level Sn as in Example 1 was used for the anode.
- the deposited electrolytic tin was melted and fabricated at a temperature of 500 ° C. to obtain a tin ingot. This trap The fabricated tin ingot was stored for 10 months in a nitrogen atmosphere. As a result of examining the radiation dose after 10 months, the ⁇ ray count was 0.0005 cph m 2 . Table 1 shows the analytical values of tin after purification.
- Raw material tin was leached with hydrochloric acid, and this leaching solution was used as an electrolytic solution. Further, the same 3N level Sn as in Example 1 was used for the anode. This is electrolysis temperature 50. Electrolysis was performed under the conditions of C and current density of 10 A / dm 2 .
- the deposited electrolytic tin was melted and formed at a temperature of 350 ° C. to obtain a tin ingot.
- the manufactured tin ingot was stored in a vacuum for 20 months.
- the ⁇ -ray count was 0.0009 cph m 2 .
- the analytical values of tin after purification are also shown in Table 1.
- Raw material tin was leached with hydrochloric acid, and this leaching solution was used as an electrolytic solution. Further, the same 3N level Sn as in Example 1 was used for the anode. This is electrolysis temperature 40. Electrolysis was performed under the conditions of C and current density of 15 A / dm 2 . In addition, 50 g / L of tin oxide was placed in the electrolyte and suspended. By the above purification after electrolysis, the Pb content was 0.06 ppm and the Bi content was O.Olppm. In addition, the content of each of U and Th became Sp 5p pb. Thus, the decrease in the Pb and Bi contents and the U and Th contents is due to the adsorption of the impurities Pb and Bi to the suspended tin oxide, and the impurities U and The decrease in Th is due to electrolysis.
- the deposited electrolytic tin was melted and fabricated at a temperature of 400 ° C. to obtain a tin ingot.
- This manufactured tin ingot was stored in a desiccator for 50 months.
- the power of the wire count was less than .0005 cph m 2 .
- the analytical values of tin after purification are also shown in Table 1.
- Raw material tin was leached with sulfuric acid, and this leaching solution was used as an electrolyte.
- the same 3N level Sn as in Example 1 was used for the anode. This is the same condition as in Example 1, ie, electrolysis temperature 25. C, was electrolytically on the condition that the current density of 3A / dm 2.
- the suspension material was not put in electrolyte solution.
- the Pb content was 200 ppm and the Bi content was 20 ppm.
- the contents of U and Th were 0.01 ppb and 0.006 ppb, respectively. This was an impurity level not much different from the raw material.
- the deposited electrolytic tin was melt-cast under a condition of 240 ° C. to obtain a tin ingot.
- the tin ingot after this production was stored in an argon atmosphere for 6 months.
- the filament count was 8.0 cph m 2 .
- Table 1 shows the analytical values of tin after purification.
- the high-purity tin produced in Example 1 was prepared.
- the additive elements of the tin alloy of this example were purified from commercially available silver and copper to 5N5-Ag and 6N-Cu by electrolysis. These were added to the high purity tin and melted and fabricated at a temperature of 260 ° C. in an inert atmosphere to produce a Sn—Cu—Ag alloy ingot composed of 0.5% Cu—3% Ag—the balance Sn. .
- the forged tin ingot was stored in an argon gas atmosphere for 6 months.
- the number of strands was 0.0007 cph m 2 .
- Table 2 shows the analytical values of the tin alloy.
- the high-purity tin produced in Example 1 was prepared.
- Silver which is an additive element of the tin alloy of the present example, is obtained by dissolving commercially available Ag with nitric acid, adding HC1 to this, precipitating AgCl, and further reducing it to a high concentration of 5N-Ag. Purity Ag was obtained. This was added to the high-purity tin and melted and produced at a temperature of 260 ° C. in an inert atmosphere to produce a Sn—Ag alloy ingot consisting of 3.5% Ag—the balance Sn.
- the forged tin ingot was stored in an argon gas atmosphere for 6 months.
- the filament count was 0.0005 cph m 2 .
- Table 2 shows the analytical values of the tin alloy.
- U is a radioactive element, 5 ppb or less the content of each of Th, Pb which emits radiation shed particles, the content of each of Bi is less LPPM, further shed ray count N 0.00 lcph m 2 or less.
- Example 7 Tetin alloy consisting of 9% Zn-balance Sn
- the high-purity tin produced in Example 1 was prepared.
- the additive element of the tin alloy of this example was 6N-Zn, which was obtained by highly purifying commercially available silver and zinc by electrolysis. These were added to the high-purity tin and melted and fabricated at a temperature of 260 ° C. in an inert atmosphere to produce a Sn—Zn alloy ingot composed of 9% Zn—the balance Sn.
- the forged tin ingot was stored in an argon gas atmosphere for 6 months.
- the filament count was 0.0008 cph m 2 .
- Table 2 shows the analytical values of the tin alloy.
- the high-purity tin produced in Example 1 was prepared. Commercially available 3N level silver and copper were used as additive elements of the tin alloy of this example. These were added to the high-purity tin and melted and fabricated at a temperature of 260 ° C. in an inert atmosphere to produce a Sn—Cu—Ag alloy ingot composed of 0.5% Cu—3% Ag—the balance Sn.
- the forged tin ingot was stored in an argon gas atmosphere for 6 months.
- the ⁇ ray count was O. lcphAm 2 .
- Table 2 shows the analytical values of the tin alloy.
- the high-purity tin produced in Example 1 was prepared.
- Silver which is an additive element of the tin alloy of this example Added a commercially available 3N level Ag to the high-purity tin, and melted and cast it at 260 ° C. in an inert atmosphere to produce a Sn-Ag alloy ingot composed of 3.5% Ag-remainder Sn.
- the forged tin ingot was stored in an argon gas atmosphere for 6 months.
- the wire count was 0.03 cph m 2 .
- Table 2 shows the analytical values of the tin alloy.
- the high-purity tin produced in Example 1 was prepared. Commercially available 3N level silver and zinc were used as additive elements of the tin alloy of this example. These were added to the high-purity tin and melted and fabricated at a temperature of 260 ° C. in an inert atmosphere to produce a Sn—Zn alloy ingot composed of 9% Zn—the balance Sn.
- the forged tin ingot was stored in an argon gas atmosphere for 6 months.
- the ⁇ ray count was 0.5 C phAm 2 .
- Table 2 shows the analytical values of the tin alloy.
- the present invention has a purity of 5N or more (except for gas components of 0, C, N, H, S, and P), and among them, the contents of U and Th that are radioactive elements are included.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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US11/916,906 US20090098012A1 (en) | 2005-07-01 | 2006-06-14 | High-Purity Tin or Tin Alloy and Process for Producing High-Purity Tin |
JP2007523392A JP4472752B2 (ja) | 2005-07-01 | 2006-06-14 | 高純度錫又は錫合金及び高純度錫の製造方法 |
EP06766681.8A EP1900853B1 (en) | 2005-07-01 | 2006-06-14 | Process for producing high-purity tin |
SG2007184468A SG138124A1 (en) | 2005-07-01 | 2006-06-14 | High-purity tin or tin alloy and process for producing high-purity tin |
CN2006800239270A CN101213326B (zh) | 2005-07-01 | 2006-06-14 | 高纯度锡或锡合金及高纯度锡的制造方法 |
US14/340,933 US9340850B2 (en) | 2005-07-01 | 2014-07-25 | Process for producing high-purity tin |
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JP2005193323 | 2005-07-01 | ||
JP2005-193323 | 2005-07-01 |
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US11/916,906 A-371-Of-International US20090098012A1 (en) | 2005-07-01 | 2006-06-14 | High-Purity Tin or Tin Alloy and Process for Producing High-Purity Tin |
US14/340,933 Division US9340850B2 (en) | 2005-07-01 | 2014-07-25 | Process for producing high-purity tin |
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WO2007004394A1 true WO2007004394A1 (ja) | 2007-01-11 |
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US (2) | US20090098012A1 (ja) |
EP (1) | EP1900853B1 (ja) |
JP (3) | JP4472752B2 (ja) |
KR (1) | KR100958652B1 (ja) |
CN (2) | CN101213326B (ja) |
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TW (1) | TW200712263A (ja) |
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Also Published As
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US20140332404A1 (en) | 2014-11-13 |
TW200712263A (en) | 2007-04-01 |
US20090098012A1 (en) | 2009-04-16 |
EP1900853A4 (en) | 2011-07-06 |
JPWO2007004394A1 (ja) | 2009-01-22 |
CN101213326B (zh) | 2010-11-17 |
JP5296269B1 (ja) | 2013-09-25 |
JP5295987B2 (ja) | 2013-09-18 |
TWI320433B (ja) | 2010-02-11 |
SG138124A1 (en) | 2008-09-30 |
CN101880893A (zh) | 2010-11-10 |
US9340850B2 (en) | 2016-05-17 |
EP1900853B1 (en) | 2018-05-09 |
JP2010156052A (ja) | 2010-07-15 |
KR20080015942A (ko) | 2008-02-20 |
JP4472752B2 (ja) | 2010-06-02 |
EP1900853A1 (en) | 2008-03-19 |
KR100958652B1 (ko) | 2010-05-20 |
CN101213326A (zh) | 2008-07-02 |
JP2013189710A (ja) | 2013-09-26 |
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