CN110453105A - A kind of palladium molybdenum precision electrical resistance alloy and preparation method thereof - Google Patents
A kind of palladium molybdenum precision electrical resistance alloy and preparation method thereof Download PDFInfo
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- CN110453105A CN110453105A CN201910822074.6A CN201910822074A CN110453105A CN 110453105 A CN110453105 A CN 110453105A CN 201910822074 A CN201910822074 A CN 201910822074A CN 110453105 A CN110453105 A CN 110453105A
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- 239000000956 alloy Substances 0.000 title claims abstract description 52
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 46
- 229910052763 palladium Inorganic materials 0.000 title claims abstract description 19
- 229910052750 molybdenum Inorganic materials 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 title claims abstract description 8
- 239000011733 molybdenum Substances 0.000 title claims abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 15
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 11
- 238000005242 forging Methods 0.000 claims abstract description 10
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000009466 transformation Effects 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 14
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 11
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 9
- 238000010583 slow cooling Methods 0.000 claims description 9
- 239000000470 constituent Substances 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000004615 ingredient Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000002425 crystallisation Methods 0.000 claims description 5
- 230000008025 crystallization Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 235000019628 coolness Nutrition 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000006104 solid solution Substances 0.000 description 5
- 229910000510 noble metal Inorganic materials 0.000 description 4
- 229910052774 Proactinium Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229910052571 earthenware Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
-
- 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
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/04—Alloys based on a platinum group metal
-
- 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
- C22F1/14—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a kind of palladium molybdenum precision electrical resistance alloy and preparation method thereof, the chemical component mass percent of the alloy is 30~40Mo, 0.5~6M (at least one of Zr, Cr, Y), surplus Pd.Ingot casting is prepared using high-frequency induction melting, finished product is prepared by processes such as high temperature forging, shortrange order transformation heat treatments, the alloy has high resistivity and tensile strength, low temperature-coefficient of electrical resistance, high inoxidizability and wearability, it is the precision electrical resistance alloy material of high comprehensive performance, there is widely application prospect in the sophisticated technologies such as electronic computation technology, space flight and aviation field.
Description
Technical field
The present invention relates to a kind of palladium molybdenum precision electrical resistance alloys and preparation method thereof, belong to metal material field.
Background technique
Noble metal precision electrical resistance alloy is widely used in making the precision potentiator and resistor of high stable, it has also become electricity
The indispensable critical material in the fields such as son, telecommunication, electrician and instrument.
With the rapid development of modern science and technology, especially electronic computation technology, space flight, aviation, navigation and weapons etc.
The development of advanced science technology proposes increasingly higher demands to precision resistance material, and total requirement is " high resistance, Gao Ke
It leans on, is high-accuracy, high abrasion, long-life ".It has been found that the palldium alloy containing a small amount of magnesium-yttrium-transition metal W, V, Mo has high electricity
Resistance rate, low temperature-coefficient of electrical resistance, this two indexs are superior to platinum base alloy, are accurate high using more noble metal at present
Hinder material.The crystal structure of these alloys is all face-centered cubic crystal constituent element addition body-centered cubic constituent element composition, and this kind of alloy is logical
Shortrange order variation, i.e. " K " effect often occur in Slow cooling, causes resistivity and tensile strength to increase at this time, resistance temperature
Spend coefficient decline.
Wherein the characteristics of Pd-Mo alloy system is that palladium base solid solution range is very wide, and solubility maximum of the Mo in solid solution can
Reach 50%, as resistivity, the tensile strength etc. of the increase alloy of Mo content obviously increase.Nineteen fifty-nine United States Patent (USP)
(Konrad Ruthardt,Hermann Speidel.Potentiometer electrical resistance elements
Of palladium base alloys:2890114 [P] .1959-07-09) it reports containing 1%~30% W, Mo or two
Person has concurrently, and surplus is the precision electrical resistance alloy of Pd, and embodiment is PdW15, PdW25, PdMo10 and PdMo15, wherein PdMo10 and
The resistivity of PdMo15 is respectively 90 and 110 μ Ω cm.Progress of the domestic Zhang Shuren in noble metal precision electrical resistance alloy, your gold
Belong in the Review literature of performance, application and its preparation of high-resistance alloy and some problem of noble metal precision electrical resistance alloy to PdMo
Research report in terms of alloy is used as precision electrical resistance alloy material is all the research achievement for quoting United States Patent (USP) [2890114].It is yellow
Rainbow report amount containing Mo (at%) be respectively 1,3,5,7 and 10 palladium molybdenum alloy about hydrogenization to mechanical and physical property
It influences, is applied for palladium molybdenum alloy and provide technical support in hydrogeneous medium.Xie Ming reports chemical component weight ratio: 5.0-
30.0W, 0.1-5.0Mo, 0.1-5.0Re, surplus are the precision electrical resistance alloy material of Pd, using powder metallurgy and isostatic cool pressing at
Type prepares alloy bar material 15~Φ of Φ 50mm.
The palladium molybdenum alloy for Mo content greater than 30% or more is used as the performance and preparation of precision resistance material both at home and abroad, until
The present has no document report.
Summary of the invention
The present invention provides a kind of palladium molybdenum precision electrical resistance alloy material, the alloying component is 30~40Mo, 0.5~
6.0M (at least one of Zr, Cr, Y), surplus Pd.The present invention also provides the preparation methods of the alloy, using high-frequency induction
Melting prepares ingot casting, by high temperature forging, room temperature drawing, intermediate annealing, fine drawing, shortrange order transformation heat treatment, preparation
Out high resistivity, high intensity, high abrasion, low resistance temperature coefficient high comprehensive performance precision electrical resistance alloy material.
The present invention selects Pd-Mo alloy for matrix, and the additive amount of Mo can get high resistivity and be resisted between 30~40
Tensile strength, low temperature-coefficient of electrical resistance.The present invention is had found by the general rule and a large number of experiments of solid solution alloy: in PdMo
Zr, Cr, Y that a small amount of mass percent is added in alloy can play the role of apparent solution strengthening and refined crystalline strengthening, improve conjunction
Resistivity, tensile strength and the hardness of gold, while improving alloy structure uniformity and stability；In addition addition element Cr and Y are excellent
One layer of dense oxidation film first is formed in alloy surface, the oxidation and volatilization of Mo is reduced, improves the inoxidizability and wearability of alloy.
The present invention forms shortrange order in annealing slow cooling process using Pd-Mo alloy and changes, and further improves alloy
Resistivity, tensile strength, hardness etc., while low-alloyed resistivity dropping；In addition alloy is in annealing slow cooling process with Mo
The reduction of content solubility in (Pd) solid solution, is precipitated (Mo) solid solution, and resistivity, tensile strength, the hardness of alloy also can
It obviously increases, finally obtains the precision electrical resistance alloy material of high comprehensive performance,
The technical solution of present invention realization above-mentioned purpose are as follows:
A kind of palladium molybdenum precision electrical resistance alloy, alloying component are 30~40Mo, and 0.5~6M is (at least one in M=Zr, Cr, Y
Kind), surplus Pd.
A kind of preparation method of palladium molybdenum precision electrical resistance alloy sequentially includes following process steps:
(1) each constituent element of alloy presses nominal composition ingredient, and material purity is greater than 99.99%；
(2) Efco-Northrup furnace melting, high-purity zirconia crucible are used, is vacuumized (greater than 10-4Pa high-purity argon gas guarantor) is filled again
Shield, after 100~200 DEG C of melt overheat in casting crystallization mold, ingot casting bar size is 5~Φ of Φ 50mm；
(3) ingot casting controls in 8~15% ranges by 1300 DEG C~1500 DEG C forgings, pass deformation, forging to Φ
5.0±0.1mm；Drawing deformation for a pass controls the total deformation 60~80% in 5~10% ranges；Intermediate anneal temperature
1200 DEG C, soaking time 30~70 minutes, quick water cooling of coming out of the stove；Fine drawing pass deformation 6~8%, total deformation 70~
90%, it is drawn into the silk material that diameter is greater than Φ 0.03mm；
(4) it carries out shortrange order transformation heat treatment: 500 DEG C~800 DEG C of temperature, 30~60 minutes is kept the temperature, with furnace slow cooling.
Specific embodiment
Material purity used in the present invention are as follows: purity >=99.99% of Pd, Mo, Zr, Cr, Y.
Embodiment 1
Each constituent element of alloy 31%Mo, 3%Cr, 2%Zr, 1%Y by weight percent, the composition ingredient of Pd surplus；With high-purity
Zirconium crucible, Efco-Northrup furnace melting are aoxidized, working chamber is first evacuated to 0.4 × 10 in melting-4Pa is filled with high-purity argon gas
(99.999%, volume fraction) to positive pressure, alloy answers abundant degasification in molten condition to improve the consistency of ingot casting, melt overheat
After 150 DEG C in casting crystallization mold；It is forged by 1300 DEG C, pass deformation 10%, forging to Φ 5.0mm；Drawing passes becomes
Shape amount 8%, total deformation 80%；Intermediate annealing uses 1200 DEG C of soaking time 50 minutes quick water coolings of coming out of the stove；Thin draw bead time becomes
Shape amount 8%, total deformation 90% are drawn into the silk material of diameter of phi 0.030mm；600 DEG C of heat preservations are carried out 60 minutes with furnace slow cooling
Shortrange order transformation heat treatment.The performance of alloy: resistivity 148.6 μ Ω cm, tensile strength 980MPa, temperature-coefficient of electrical resistance
96ppm/℃。
Embodiment 2
Each constituent element of alloy presses 33%Mo, 2%Cr, 1%Zr, 0.5%Y, the composition ingredient of Pd surplus；With high-purity zirconia earthenware
Crucible, Efco-Northrup furnace melting, are first evacuated to 0.3 × 10 for working chamber in melting-4Pa, be filled with high-purity argon gas (99.999%,
Volume fraction) to positive pressure, alloy answers abundant degasification in molten condition to improve the consistency of ingot casting, pours after 180 DEG C of melt overheat
In casting crystallization mold；It is forged by 1400 DEG C, pass deformation 9%, forging to Φ 4.9mm；Drawing deformation for a pass 8%, always
Deflection 70%；Intermediate annealing uses 1200 DEG C of soaking time 60 minutes quick water coolings of coming out of the stove；It is thin to draw pass deformation 7%, always
Deflection 80% is drawn into the silk material of diameter of phi 0.032mm；The shortrange order for carrying out 700 DEG C of heat preservations 60 minutes with furnace slow cooling turns
Heating processing.The performance of alloy: resistivity 155.8 μ Ω cm, tensile strength 1120MPa, temperature-coefficient of electrical resistance 87.6ppm/
℃。
Embodiment 3
Each constituent element of alloy presses 36%Mo, 1%Cr, 0.5%Zr, the composition ingredient of Pd surplus；With high-purity zirconia crucible, height
Working chamber is first evacuated to 0.1 × 10 in melting by frequency induction furnace melting-4Pa, be filled with high-purity argon gas (99.999%, volume
Score) to positive pressure, alloy answers abundant degasification in molten condition to improve the consistency of ingot casting, casts and ties after 200 DEG C of melt overheat
In brilliant mold；It is forged by 1450 DEG C, pass deformation 9%, forging to Φ 4.9mm；Drawing deformation for a pass 8%, total deformation
Amount 70%；Intermediate annealing uses 1200 DEG C of soaking time 70 minutes quick water coolings of coming out of the stove；It is thin to draw pass deformation 6%, total deformation
Amount 80%, is drawn into the silk material of diameter of phi 0.032mm；The shortrange order heat of transformation for carrying out 750 DEG C of heat preservations 60 minutes with furnace slow cooling
Processing.The performance of alloy: resistivity 162.4 μ Ω cm, tensile strength 1265MPa, 72ppm/ DEG C of temperature-coefficient of electrical resistance.
Claims (7)
1. a kind of palladium molybdenum precision electrical resistance alloy, it is characterised in that the mass percent of alloying component is 30~40Mo, surplus Pd.
2. alloy according to claim 1, it is characterised in that 0.5~6M can be added in PdMo alloy, in M=Zr, Cr, Y at least
It is a kind of.
3. the preparation method of palladium molybdenum alloy according to claim 1 or 2, it is characterised in that sequentially include that following process walks
It is rapid:
(1) each constituent element of alloy presses nominal composition ingredient, and material purity is greater than 99.99%；
(2) Efco-Northrup furnace melting, high-purity zirconia crucible are used, is vacuumized (greater than 10-4Pa high-purity argon gas protection) is filled again, to
After 100~200 DEG C of melt overheat in casting crystallization mold, ingot casting bar size is 5~Φ of Φ 50mm；
(3) ingot casting passes through high temperature forging, room temperature drawing, intermediate annealing, fine drawing, is processed into the silk that diameter is greater than Φ 0.03mm
Material；
(4) shortrange order transformation heat treatment is carried out.
4. the preparation method of palladium molybdenum alloy according to claim 3, it is characterised in that processing step (3) high temperature forging
Technological parameter: 1300 DEG C~1500 DEG C.
5. the preparation method of palladium molybdenum alloy according to claim 3, it is characterised in that processing step (3) intermediate annealing
Technological parameter: 1200 DEG C, 30~70 minutes are kept the temperature, quick water cooling of coming out of the stove.
6. the preparation method of palladium molybdenum alloy according to claim 3, it is characterised in that processing step (4) shortrange order
Change heat treatment process parameter: 500 DEG C~800 DEG C, 30~60 minutes is kept the temperature, with furnace slow cooling.
7. a kind of preparation method of palladium molybdenum alloy, it is characterised in that sequentially include following process steps:
Each constituent element of alloy 31%Mo, 3%Cr, 2%Zr, 1%Y by weight percent, the composition ingredient of Pd surplus；With high pure zirconia
Zirconium crucible, Efco-Northrup furnace melting, are first evacuated to 0.4 × 10 for working chamber in melting-4Pa is filled with high-purity argon gas to just
Pressure, the volume fraction of high-purity argon gas are 99.999%, and alloy answers abundant degasification in molten condition to improve the consistency of ingot casting, are melted
After body overheats 150 DEG C in casting crystallization mold；It is forged by 1300 DEG C, pass deformation 10%, forging to Φ 5.0mm；Drawing
Pass deformation 8%, total deformation 80%；Intermediate annealing uses 1200 DEG C of soaking time 50 minutes quick water coolings of coming out of the stove；It is thin to draw
Pass deformation 8%, total deformation 90% are drawn into the silk material of diameter of phi 0.030mm；600 DEG C of heat preservations are carried out 60 minutes with furnace
The shortrange order of slow cooling changes heat treatment.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983147A (en) * | 2019-12-20 | 2020-04-10 | 有研亿金新材料有限公司 | High-strength palladium-based weak electrical contact material and preparation method thereof |
| CN111424190A (en) * | 2020-05-18 | 2020-07-17 | 新化县和安盛电子科技有限公司 | Metal wire alloy material for precision resistor and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412162A (en) * | 2008-11-28 | 2009-04-22 | 西北有色金属研究院 | Palladium-molybdenum binary alloy high-temperature brazing material |
| CN108179303A (en) * | 2017-12-13 | 2018-06-19 | 贵研铂业股份有限公司 | A kind of novel platinum base high temperature resistance strain alloy and preparation method thereof |
-
2019
- 2019-09-02 CN CN201910822074.6A patent/CN110453105B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412162A (en) * | 2008-11-28 | 2009-04-22 | 西北有色金属研究院 | Palladium-molybdenum binary alloy high-temperature brazing material |
| CN108179303A (en) * | 2017-12-13 | 2018-06-19 | 贵研铂业股份有限公司 | A kind of novel platinum base high temperature resistance strain alloy and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983147A (en) * | 2019-12-20 | 2020-04-10 | 有研亿金新材料有限公司 | High-strength palladium-based weak electrical contact material and preparation method thereof |
| CN110983147B (en) * | 2019-12-20 | 2021-05-11 | 有研亿金新材料有限公司 | High-strength palladium-based weak electrical contact material and preparation method thereof |
| CN111424190A (en) * | 2020-05-18 | 2020-07-17 | 新化县和安盛电子科技有限公司 | Metal wire alloy material for precision resistor and preparation method thereof |
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Address after: No. 988, Keji Road, high tech Development Zone, Wuhua District, Kunming, Yunnan 650000 (Kunming Precious Metals Research Institute) Patentee after: Yunnan Precious Metal New Materials Holding Group Co.,Ltd. Country or region after: China Address before: No. 988, Keji Road, high tech Development Zone, Wuhua District, Kunming, Yunnan 650000 (Kunming Precious Metals Research Institute) Patentee before: Sino-Platinum Metals Co.,Ltd. Country or region before: China |
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