CN107502768A - A kind of siller tin oxide tungsten carbide composite electric contact material preparation method and products thereof - Google Patents
A kind of siller tin oxide tungsten carbide composite electric contact material preparation method and products thereof Download PDFInfo
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- CN107502768A CN107502768A CN201710630156.1A CN201710630156A CN107502768A CN 107502768 A CN107502768 A CN 107502768A CN 201710630156 A CN201710630156 A CN 201710630156A CN 107502768 A CN107502768 A CN 107502768A
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- 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
- C22C1/05—Mixtures of metal powder with non-metallic powder
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0005—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with at least one oxide and at least one of carbides, nitrides, borides or silicides as the main non-metallic constituents
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- 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
- C22C5/06—Alloys based on silver
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
- H01H1/021—Composite material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
- H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes
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- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- Mechanical Engineering (AREA)
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- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
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Abstract
The invention discloses a kind of siller tin oxide tungsten carbide composite electric contact material preparation method and products thereof, its technical scheme is that the contact body material includes following components：Tin oxide 1 20%, tungsten carbide 0.01 ~ 10%, additive≤5%, surplus are silver；The present invention has the advantage that and good effect：1st, make it that mixed powder uniformity is more preferable using electronation cladding process, sintering strength is higher；2、WC、SnO2Powder surface uniformly coats silver layer, improves anti electric arc corrosion, the resistance fusion welding of electrical contact material, improves the reliability of contactor；3rd, the AgSnO of proper composition is selected2WC contact materials, improve the arc resistant scaling loss ability and resistance fusion welding energy of contact, while reduce contact silver content, play the silver-colored effect of section.
Description
Technical field
The invention belongs to electrical contact material field, in particular to a kind of siller tin oxide tungsten carbide composite electric contact material
（AgSnO2WC）Preparation method and products thereof.
Background technology
At present mostly using silver-based material as electrical contact material in low voltage electrical apparatus industry, and wherein siller tin oxide（AgSnO2）
Material has the comprehensive electrochemical properties of excellent anti electric arc corrosion, resistance fusion welding and low and stabilization contact resistance due to it,
Occupied an important position in whole electrical contact material system.In electrical contact contact process, the melting welding between contact is that it mainly loses
One of effect form.The common method for improving material resistance fusion welding energy is to improve the content of refractory oxide composition in material,
The program can reduce the electric conductivity of material, and the limitation that can be improved.Another kind improves the side of material resistance fusion welding energy
Method makes oxide particle be separated out in needle-like（Needle-like direction is perpendicular to working face）, this method needs are in internal oxidation process material
It can just realize, but in powder metallurgic method（Including preoxidation and powder mixing method）But it is difficult to realize in technique, also, powder smelting
The mixed powder that golden method obtains, due to the limitation of physics powder, uniformity is difficult further to improve, and powder agglomerated defects can influence silver
The comprehensive electrochemical properties of stannic oxide materials, reduce the service life of contact.
AgWC is also a kind of electrical contact material, because WC fusing point is up to 2870 DEG C, is had in disjunction high current excellent
Resistance fusion welding, be typically used in breaker.
Patent CN103589898A discloses a kind of preparation method of siluer metal oxide tungsten carbide composite electric contact material
And products thereof, but it is preoxidation and common powder mixing method that the method, which prepares mixing powder craft, not using electronation cladding process,
The limitation of physics powder can not be overcome, mixed powder uniformity has much room for improvement；
Patent CN101976615A discloses silver-colored tungsten carbide graphite contact material and preparation method thereof, patent CN103824710A
Disclose a kind of silver-colored cladded wolfram carbide powder and prepare method of silver-tungsten carbide contact material and products thereof, above two method one is
It is different from the contact material of the present invention, although second, employ the obtained mixed powder of electronation cladding process, all do not use
Ultrasonic technology.
Therefore, find to prepare siller tin oxide tungsten carbide by electronation cladding process currently without one kind by consulting patent
The method of mixed powder, also prepare siller tin oxide tungsten carbide mixed powder not over electronation cladding process and then prepare siller tin oxide
The method of tungsten carbide composite electric contact material.
The content of the invention
The invention aims to overcome shortcoming and defect existing for prior art, and provide a kind of siller tin oxide carbonization
Tungsten composite electric contact material preparation method, the siller tin oxide tungsten carbide composite electric contact material prepared by this method overcome powder
The limitation of physics powder in last metallurgy method, uniformity is more preferable, and sintering strength is higher.
Second purpose of the invention is to provide a kind of siller tin oxide tungsten carbide compound electric based on prepared by the above method and touched
Head material.
To realize above-mentioned first goal of the invention, the technical scheme is that comprising the following steps：
（1）Configure silver-colored ammonia mixed solution, pH value 11-13；
（2）Add pure water into reaction vessel, start agitator, start ultrasonic equipment, weigh putty powder, additive powder and
Tungsten carbide powder is sequentially added in reaction vessel, is then added hydrazine hydrate solution in reaction vessel；It is common in stirring and ultrasonic wave
10-20min is acted on, described additive powder is WO3 、Bi2O3 、TeO2 、Sb2O3 、In2O3 、MoO3 Middle one or more；
（3）Be kept stirring for ultrasonic wave collective effect, silver-colored ammonia mixed solution is added in reaction vessel；In course of reaction, silver
For ammonia mixed solution under hydrazine hydrate reduction effect, silver atoms are coated on putty powder, additive powder and tungsten carbide powder surface reduction
Out；After silver-colored ammonia mixed solution adds, ultrasonic wave and stirring work on 5-10min；
（4）Ultrasonic wave is closed, mixing speed is constant, and mixed powder in reaction vessel and solution are put into vacuum suction filtration tank；Cleaning
Mixed powder to pH value is 7；Mixed powder sabot is dried, sieved；
（5）Mixed powder is obtained into first pressing pressed compact using compression-moulding methods, relative density is controlled 65% ~ 85%；Mixed during first pressing
Closing powder solder side, uniformly one layer of silver powder of paving is controlled the 5% ~ 30% of contact gross thickness as welding silver layer, silver thickness；
（6）First pressing pressed compact sinters 2 ~ 5 hours under the conditions of protective atmosphere in 600 ~ 900 DEG C；
（7）Pressed compact after sintering is suppressed into finished product contact in multiple compression mould, 5 ~ 15T/cm of multiple pressure pressure2。
It is described step further to set（1）For：Fine silver plate concentrated nitric acid is dissolved completely, obtains silver nitrate solution；
Add ammoniacal liquor while stirring into silver nitrate solution, obtain silver-colored ammonia mixed solution.
It is the step further to set（2）The ultrasonic frequency of middle ultrasonic equipment is 30-40kHz, power 50-
200W。
It is the step further to set（2）Middle hydrazine hydrate solution for mass fraction 80% hydrazine hydrate and pure water according to body
Product ratio（1~1.5）:1 prepares.
To realize second goal of the invention of the present invention, its technical scheme is to include contact body and welding silver layer, described
Contact body include following components, by percentage to the quality：
Tin oxide 1-20wt%, 0.01 ~ 10wt% of tungsten carbide, additive≤5wt%, surplus are described in the contact body to be silver-colored
Silver is that the form for being coated on tin oxide, additive and tungsten carbide outer surface is present；
Wherein additive includes following components, in terms of weight/mass percentage composition：
WO3 0.05~2.0 wt%；Bi2O3 0.05~2.5 wt%；TeO2 0.05~2.5 wt%；Sb2O3 0.05~1.0 wt%；
In2O3 0.05~5.0 wt%；MoO3 0.05~2.0 wt%。
Different in cladded type composite granule of the present invention can mutually reach intergranular mixing one by one, and general composite powder
Body does not realize the uniform mixability in particle rank then.WC、SnO2Powder surface uniformly coats silver layer, fully utilizes silver
Tin oxide（AgSnO2）And tungsten carbide（WC）Two kinds of respective advantages of contact material, improve the anti electric arc corrosion of electrical contact material
Property, resistance fusion welding, make it have wider application.
The present invention uses electronation cladding process by WC, SnO2It is evenly distributed on additive in Ag matrix materials, WC
Grain will not melt during electrical arc erosion, and when welding tendency occurs in contact, equally distributed high-melting-point WC particle can rise
To the effect of melting welding power between reduction contact, open the easy disjunction of contact of melting welding, so as to improve the resistance fusion welding energy of contact.WC's
Resistivity is 19.2 × 10-6Ω cm, and tin, Sn oxide resistor rate is very high or non-conductive, WC addition is to AgSnO2Matrix material
Electric conductivity influence it is little.
The present invention has the advantage that and good effect：1st, make it that mixed powder uniformity is more preferable using electronation cladding process,
Sintering strength is higher；2、WC、SnO2Powder surface uniformly coats silver layer, improves the anti electric arc corrosion of electrical contact material, resists and melt
Weldering property, improve the reliability of contactor；3rd, the AgSnO of proper composition is selected2WC contact materials, the arc resistant for improving contact burn
Damage ability and resistance fusion welding energy, while contact silver content is reduced, play certain section silver effect；4th, the technique that the present invention designs
Route is simple, and stock utilization is high, with short production cycle, is adapted to produce in enormous quantities.
The present invention is described further with reference to embodiment.
Embodiment
The present invention is specifically described below by embodiment, is served only for that the present invention is further described, no
It is understood that for limiting the scope of the present invention, the technician in the field can be according to the content of foregoing invention to the present invention
Make some nonessential modifications and adaptations.
Embodiment one：
1st, 22.25kg fine silver plates are rolled down into 1mm thickness to be placed in the molten bucket of acid, 10L pure water, Ran Houjia is added into the molten bucket of acid
Enter the pure concentrated nitric acid 25L of 65% analysis.After fine silver plate is completely dissolved in the molten bucket of acid, standing treats that silver nitrate solution cools down；Silver nitrate is molten
After liquid is cooled to normal temperature, it is 25% ammoniacal liquor that mass fraction is added into silver nitrate solution while stirring, makes silver-colored ammonia mixed solution pH value
For 11.
2、（1）Pure water is added into reaction vessel, starts agitator, starts ultrasonic equipment, frequency 40kHz, power
For 150W；（2）Weigh SnO2Powder 2kg, additive powder 0.25kg（Including 0.1kg Bi2O3With 0.15kg In2O3）With WC powder
0.5kg is sequentially added in reaction vessel；（3）The hydrazine hydrate and pure water of mass fraction 80% are according to volume ratio 1:1 preparation hydrazine hydrate is molten
Liquid 15L；（4）Hydrazine hydrate solution is added in reaction vessel；In stirring and ultrasonic wave collective effect 15min；
3rd, be kept stirring for ultrasonic wave collective effect, silver-colored ammonia mixed solution is added in reaction vessel.In course of reaction, silver-colored ammonia
Under hydrazine hydrate reduction effect, silver powder is coated on putty powder, additive powder and tungsten carbide powder surface reduction and come out mixed solution；
After silver-colored ammonia mixed solution adds, ultrasonic wave and stirring work on 10min；
4th, ultrasonic wave is closed, mixing speed is constant, and mixed powder in reaction vessel and solution are put into vacuum suction filtration tank；Cleaning is mixed
It is 7 to close powder to pH value；Mixed powder sabot is dried, sieved；
5th, mixed powder is obtained into first pressing pressed compact using compression-moulding methods, relative density is controlled 70%；Welded during first pressing in mixed powder
Uniformly one layer of silver powder of paving controls the 5% of contact gross thickness junction as welding silver layer, silver thickness；
6th, first pressing pressed compact sinters 4 hours under the conditions of protective atmosphere in 900 DEG C；
7th, the pressed compact after sintering is suppressed into 25x25x4mm finished products contact in multiple compression mould, multiple pressure pressure 10T/cm2。
Embodiment two：
1st, 21.15kg fine silver plates are rolled down into 1mm thickness to be placed in the molten bucket of acid, 10L pure water, Ran Houjia is added into the molten bucket of acid
Enter the pure concentrated nitric acid 25L of 65% analysis.After fine silver plate is completely dissolved in the molten bucket of acid, standing treats that silver nitrate solution cools down；Silver nitrate is molten
After liquid is cooled to normal temperature, it is 25% ammoniacal liquor that mass fraction is added into silver nitrate solution while stirring, makes silver-colored ammonia mixed solution pH value
For 13.
2、（1）Add pure water into reaction vessel, start agitator, start ultrasonic equipment, frequency 30kHz, power
For 100W；（2）Weigh SnO2Powder 2.5kg, additive powder 0.5kg（Including 0.2kg Bi2O3、0.2kg MoO3With 0.1kg WO3）
Sequentially added with WC powder 0.85kg in reaction vessel；（3）The hydrazine hydrate and pure water of mass fraction 80% are according to volume ratio 1:1 prepares
Hydrazine hydrate solution 15L；（4）Hydrazine hydrate solution is added in reaction vessel；In stirring and ultrasonic wave collective effect 15min；
3rd, be kept stirring for ultrasonic wave collective effect, silver-colored ammonia mixed solution is added in reaction vessel.In course of reaction, silver-colored ammonia
Under hydrazine hydrate reduction effect, silver powder is coated on putty powder, additive powder and tungsten carbide powder surface reduction and come out mixed solution；
After silver-colored ammonia mixed solution adds, ultrasonic wave and stirring work on 10min；
4th, ultrasonic wave is closed, mixing speed is constant, and mixed powder in reaction vessel and solution are put into vacuum suction filtration tank；Cleaning is mixed
It is 7 to close powder to pH value；Mixed powder sabot is dried, sieved；
5th, mixed powder is obtained into first pressing pressed compact using compression-moulding methods, relative density is controlled 75%；Welded during first pressing in mixed powder
Uniformly one layer of silver powder of paving controls the 10% of contact gross thickness junction as welding silver layer, silver thickness；
6th, first pressing pressed compact sinters 4 hours under the conditions of protective atmosphere in 880 DEG C；
7th, the pressed compact after sintering is suppressed into Φ 25x4mm finished products contact in multiple compression mould, multiple pressure pressure 12T/cm2。
Embodiment three：
1st, 18.5kg fine silver plates are rolled down into 1mm thickness to be placed in the molten bucket of acid, 7.5L pure water, Ran Houjia is added into the molten bucket of acid
Enter the pure concentrated nitric acid 20L of 65% analysis.After fine silver plate is completely dissolved in the molten bucket of acid, standing treats that silver nitrate solution cools down；Silver nitrate is molten
After liquid is cooled to normal temperature, it is 25% ammoniacal liquor that mass fraction is added into silver nitrate solution while stirring, makes silver-colored ammonia mixed solution pH value
For 12.
2、（1）Pure water is added into reaction vessel, starts agitator, starts ultrasonic equipment, frequency 40kHz, power
For 150W；（2）Weigh SnO2Powder 3.5kg, additive powder 1.2kg（Including 0.5kg In2O3、0.3kg MoO3、0.3kg TeO2With
0.1kg Sb2O3）Sequentially added with WC powder 1.8kg in reaction vessel；（3）The hydrazine hydrate and pure water of mass fraction 80% are according to volume
Than 1.5:1 prepares hydrazine hydrate solution 12.5L；（4）Hydrazine hydrate solution is added in reaction vessel；Make jointly in stirring and ultrasonic wave
Use 15min；
3rd, be kept stirring for ultrasonic wave collective effect, silver-colored ammonia mixed solution is added in reaction vessel.In course of reaction, silver-colored ammonia
Under hydrazine hydrate reduction effect, silver powder is coated on putty powder, additive powder and tungsten carbide powder surface reduction and come out mixed solution；
After silver-colored ammonia mixed solution adds, ultrasonic wave and stirring work on 10min；
4th, ultrasonic wave is closed, mixing speed is constant, and mixed powder in reaction vessel and solution are put into vacuum suction filtration tank；Cleaning is mixed
It is 7 to close powder to pH value；Mixed powder sabot is dried, sieved；
5th, mixed powder is obtained into first pressing pressed compact using compression-moulding methods, relative density is controlled 70%；Welded during first pressing in mixed powder
Uniformly one layer of silver powder of paving controls the 15% of contact gross thickness junction as welding silver layer, silver thickness；
6th, first pressing pressed compact sinters 5 hours under the conditions of protective atmosphere in 800 DEG C；
7th, the pressed compact after sintering is suppressed into 25x15x2mm finished products contact in multiple compression mould, multiple pressure pressure 10T/cm2。
Claims (5)
1. a kind of siller tin oxide tungsten carbide composite electric contact material preparation method, it is characterised in that comprise the following steps：
（1）Configure silver-colored ammonia mixed solution, pH value 11-13；
（2）Add pure water into reaction vessel, start agitator, start ultrasonic equipment, weigh putty powder, additive powder and
Tungsten carbide powder is sequentially added in reaction vessel, is then added hydrazine hydrate solution in reaction vessel；It is common in stirring and ultrasonic wave
10-20min is acted on, described additive powder is WO3、Bi2O3 、TeO2 、Sb2O3 、In2O3 、MoO3 Middle one or more；
（3）Be kept stirring for ultrasonic wave collective effect, silver-colored ammonia mixed solution is added in reaction vessel；In course of reaction, silver
For ammonia mixed solution under hydrazine hydrate reduction effect, silver atoms are coated on putty powder, additive powder and tungsten carbide powder surface reduction
Out；After silver-colored ammonia mixed solution adds, ultrasonic wave and stirring work on 5-10min；
（4）Ultrasonic wave is closed, mixing speed is constant, and mixed powder in reaction vessel and solution are put into vacuum suction filtration tank；Cleaning
Mixed powder to pH value is 7；Mixed powder sabot is dried, sieved；
（5）Mixed powder is obtained into first pressing pressed compact using compression-moulding methods, relative density is controlled 65% ~ 85%；Mixed during first pressing
Closing powder solder side, uniformly one layer of silver powder of paving is controlled the 5% ~ 30% of contact gross thickness as welding silver layer, silver thickness；
（6）First pressing pressed compact sinters 2 ~ 5 hours under the conditions of protective atmosphere in 600 ~ 900 DEG C；
（7）Pressed compact after sintering is suppressed into finished product contact in multiple compression mould, 5 ~ 15T/cm of multiple pressure pressure2。
A kind of 2. siller tin oxide tungsten carbide composite electric contact material preparation method according to claim 1, it is characterised in that
Described step（1）For：Fine silver plate concentrated nitric acid is dissolved completely, obtains silver nitrate solution；Into silver nitrate solution, side is stirred
Side adds ammoniacal liquor, obtains silver-colored ammonia mixed solution.
A kind of 3. siller tin oxide tungsten carbide composite electric contact material preparation method according to claim 1, it is characterised in that：
The step（2）The ultrasonic frequency of middle ultrasonic equipment is 30-40kHz, power 50-200W.
A kind of 4. siller tin oxide tungsten carbide composite electric contact material preparation method according to claim 1, it is characterised in that：
The step（2）Middle hydrazine hydrate solution for mass fraction 80% hydrazine hydrate and pure water according to volume ratio（1~1.5）:1 prepares.
5. the siller tin oxide tungsten carbide composite electric contact material prepared by a kind of method as described in one of claim 1-4, its
It is characterised by：Including contact body and welding silver layer, described contact body includes following components, by percentage to the quality：
Tin oxide 1-20wt%, 0.01 ~ 10wt% of tungsten carbide, additive≤5wt%, surplus are described in the contact body to be silver-colored
Silver is that the form for being coated on tin oxide, additive and tungsten carbide outer surface is present；
Wherein additive includes following components, in terms of weight/mass percentage composition：
WO3 0.05~2.0 wt%；Bi2O3 0.05~2.5 wt%；TeO2 0.05~2.5 wt%；Sb2O3 0.05~1.0 wt%；
In2O3 0.05~5.0 wt%；MoO3 0.05~2.0 wt%。
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| CN201710630156.1A CN107502768A (en) | 2017-07-28 | 2017-07-28 | A kind of siller tin oxide tungsten carbide composite electric contact material preparation method and products thereof |
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| CN201710630156.1A CN107502768A (en) | 2017-07-28 | 2017-07-28 | A kind of siller tin oxide tungsten carbide composite electric contact material preparation method and products thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126810A (en) * | 2020-09-03 | 2020-12-25 | 大都克电接触科技（中国）有限公司 | Preparation method of silver tungsten carbide graphite electrical contact material |
| CN115710653A (en) * | 2022-11-09 | 2023-02-24 | 浙江福达合金材料科技有限公司 | Preparation method of silver metal oxide electrical contact material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817079A (en) * | 2009-10-31 | 2010-09-01 | 福达合金材料股份有限公司 | Method for preparing framework coating powder of silver-tungsten carbide contact material |
| CN101794636B (en) * | 2010-02-02 | 2011-08-10 | 福达合金材料股份有限公司 | Preparation method of silver ferric oxide electrical contact material |
| CN103589898A (en) * | 2013-11-22 | 2014-02-19 | 福达合金材料股份有限公司 | Preparation method of compound electric contact material containing silver, metal oxide and tungsten carbide and product thereof |
-
2017
- 2017-07-28 CN CN201710630156.1A patent/CN107502768A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817079A (en) * | 2009-10-31 | 2010-09-01 | 福达合金材料股份有限公司 | Method for preparing framework coating powder of silver-tungsten carbide contact material |
| CN101794636B (en) * | 2010-02-02 | 2011-08-10 | 福达合金材料股份有限公司 | Preparation method of silver ferric oxide electrical contact material |
| CN103589898A (en) * | 2013-11-22 | 2014-02-19 | 福达合金材料股份有限公司 | Preparation method of compound electric contact material containing silver, metal oxide and tungsten carbide and product thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126810A (en) * | 2020-09-03 | 2020-12-25 | 大都克电接触科技（中国）有限公司 | Preparation method of silver tungsten carbide graphite electrical contact material |
| CN115710653A (en) * | 2022-11-09 | 2023-02-24 | 浙江福达合金材料科技有限公司 | Preparation method of silver metal oxide electrical contact material |
| CN115710653B (en) * | 2022-11-09 | 2023-08-29 | 浙江福达合金材料科技有限公司 | Preparation method of silver metal oxide electrical contact material |
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Application publication date: 20171222 |