CN106067391A - Stratiform silver-bearing copper pricker three-layer composite electric contact material prepared by a kind of atomization - Google Patents
Stratiform silver-bearing copper pricker three-layer composite electric contact material prepared by a kind of atomization Download PDFInfo
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- CN106067391A CN106067391A CN201610504087.5A CN201610504087A CN106067391A CN 106067391 A CN106067391 A CN 106067391A CN 201610504087 A CN201610504087 A CN 201610504087A CN 106067391 A CN106067391 A CN 106067391A
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Classifications
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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
-
- 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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
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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
Abstract
The invention discloses a kind of stratiform silver-bearing copper pricker three-layer composite electric contact material and preparation method thereof.By preparing silver alloy powder, copper alloy powder, solder, afterwards silver alloy powder, copper alloy powder, solder are prepared as band, obtain three-layer composite electric contact material through compound.Provide that a kind of the cost of material is low, the joint silver of Universal electric function admirable, environmental protection electrical contact material to substitute traditional copper alloy contact, silver alloy contact and yellow gold contact material.
Description
Technical field
The present invention relates to a kind of alloy material, stratiform silver-bearing copper pricker three prepared by a kind of atomization is multiple
Close the preparation method of electrical contact material.
Background technology
Relay, catalyst, the core parts of chopper are electrical contact (point), and it carries connects the heavy of breaking current
Task, the quality of contact elements depends on the performance of electrical contact (point) material and scientific and effective combination, and it is security appliance
Important guarantee.
At present, the contact material that on market, usage amount is maximum is silver alloy and the big class of copper alloy two.Copper alloy contact material
Certain applications are on chopper and high-voltage switch gear, although copper alloy contact material is cheap, but copper alloy electric contact antioxidation
Poor performance, different in size to the commercial time after installation, when electrical equipment shelves time length, use, electrical contact surface can form oxidation
Film, disjunction can discharge substantial amounts of heat the most in use, will also result in surface and is generated oxide-film by thermal oxide, makes contact resistance increase
Affect electric conductivity and heat conductivity greatly, make the temperature rise of electrical equipment increase；Increasing of switch temperature rise, all components and parts in meeting acceleration switch
Lost efficacy, shortened its electric life.Therefore vicious cycle occurs, makes electrical equipment cross heat-induced damage and occur that contact melted leads to safe thing
Therefore.
Existing silver alloy contact material is widely used on relay, catalyst, chopper.Wherein, silver tungsten and silver carbonization
Tungsten graphite is used in the typical material on chopper.
The most general miniature circuit breaker uses Agcdo or silver graphite alloy (such as AgC4) contact material etc..But it contains
Silver amount is the highest, and the silver content of silver cadmium oxide contact material is all more than 85%, and is the main flow product in current contact material market
Product, annual consumption silver amount is the hugest.But silver resource is very limited of today, along with the increase of consumption, will cause silver
Rapid rise of price, so that the cost producing electrical contact material remains high, Business Economic Benefit declines, and social benefit is the most greatly cut
Subtract.And another metallic element cadmium environmental pollution of this series products is relatively big, does not meets the development trend of nowadays environmental protection.Therefore,
Electrical equipment prepares business on the premise of ensureing quality, it is desirable to alloy industry uses base metal to replace noble silver to lower product
This cry is more and more higher.To this end, we need to seek a kind of energy composite copper alloy contact and silver alloy contact premium properties, and
The cost of material is low, the joint silver of Universal electric function admirable, the electrical contact material of environmental protection substitute traditional copper alloy contact, silver-colored conjunction
Gold contact and yellow gold contact material.
Summary of the invention
The deficiency existed for prior art, the cost of material is low, Universal electric to it is an object of the invention to provide one
Joint silver, the electrical contact material of environmental protection that can be excellent substitute traditional copper alloy contact, silver alloy contact and yellow gold contact
Material.
For achieving the above object, the technical scheme is that
Stratiform silver-bearing copper pricker three-layer composite electric contact material prepared by a kind of atomization,
Include successively: ag alloy layer (silver content is 70～99.9% by percentage to the quality)；
Copper alloy layer (copper content is 80～99.9% by percentage to the quality)；
Solder layer (silver-bearing copper phosphorus brazing alloy, Ag-Cu-Zn solder or amorphous brazing filler metal).
Its preparation method includes:
Step 1: use atomization to prepare silver alloy powder and copper alloy powder, and use smelting process to prepare solder；
Step 2: silver alloy powder and copper alloy powder are carried out oxidation processes, obtains silver oxide alloy powder and copper oxide
Alloy powder；
Step 3: by alloy silver powder and the copper alloy powder of step 2 gained, respectively in required ratio, uses powder mixing method, adds
Additive, and a certain proportion of abrasive material mixes, respectively obtains silver alloy and mixes powder and copper alloy mixes powder；
Step 4: silver alloy is mixed powder and copper alloy mixes powder and is shaped respectively, sinters and obtain ag alloy layer ingot blank and copper
Alloy-layer ingot blank；
Step 5: obtained ag alloy layer ingot blank, copper alloy layer ingot blank, carries out multiple pressure, extrudes and rolling obtains ag alloy layer
Band, copper alloy layer band；
Step 6: solder is made solder layer band；
Step 7: ag alloy layer band, copper alloy layer band, solder band are sequentially overlapped and carry out hot being combined together；
Step 8: the band after heat being combined is prepared as three layers of composite contact through techniques such as cold rolling, punching.
As the further modification of the present invention,
Described ag alloy layer includes that following percetage by weight forms:
Silver 80～99.9%；
Silver layer additive:
In metal, metal-oxide, nonmetal, nonmetallic compound at least one: 0.04～12%,
Diadust 0.05～4%,
Rare earth element total amount 0.01～5.7%；
Described copper alloy layer includes that following percetage by weight forms:
Copper 80～99.9%；
Layers of copper additive:
In metal, metal-oxide, nonmetal, nonmetallic compound at least one: 0.1～10.3%,
Diadust 0.05～4%,
Rare earth element total amount 0.01～5.7%.
As the further modification of the present invention,
Described silver layer additive is: include diadust, graphite, boron, aluminum, silicon, phosphorus, titanium, vanadium, chromium, manganese, ferrum, cobalt,
Nickel, copper, zinc, zirconium, niobium, molybdenum, indium, stannum, antimony, tellurium, hafnium, tantalum, tungsten, rhenium, bismuth, scandium, yttrium, lanthanum, cerium, neodymium, ytterbium, lutecium and corresponding
In nonmetallic compound or metal-oxide at least one；
Described layers of copper additive is: include diadust, graphite, boron, aluminum, silicon, phosphorus, titanium, vanadium, chromium, manganese, ferrum, cobalt,
Nickel, copper, zinc, zirconium, niobium, molybdenum, indium, stannum, antimony, tellurium, hafnium, tantalum, tungsten, rhenium, bismuth, scandium, yttrium, lanthanum, cerium, neodymium, ytterbium, lutecium and corresponding
In nonmetallic compound or metal-oxide at least one.
As the further modification of the present invention,
Metal-oxide in described silver layer additive and layers of copper additive is SnO2, ZnO, CuO, Fe2O3, CdO,
One or more oxides in In2O3, Bi2O3, Al2O3, MoO3, ZrO2, in described silver layer additive and layers of copper additive
Rare earth element be in scandium, yttrium, lanthanum, cerium, neodymium, ytterbium, lutecium one or more combination.
As the further modification of the present invention,
Described step 1: by silver and added metallic element and rare earth element, carrying out high melt, smelting temperature is
1030～1400 DEG C, after alloying, make it be atomized into silver alloy powder with water under high pressure, then dry and cross 150～250 mesh sieves and obtain
To silver alloy powder；
By copper and added metallic element and rare earth element, carrying out high melt, smelting temperature is 1030～1400 DEG C,
Make it be atomized into copper alloy powder with water under high pressure after alloying, then dry and cross 150～250 mesh sieves and obtain copper alloy powder.
As the further modification of the present invention,
Oxidizing temperature in described step 2 is 500～700 DEG C, and oxygen pressure is 1～3Mpa, and the time is 5～15 hours.
As the further modification of the present invention,
During in described step 3, additive is diamond, metal-oxide, nonmetal, nonmetallic compound, at least one, mixed
Conjunction mode is ball milling, and the mixed powder time is 6～10 hours, and ratio of grinding media to material is 15～25: 1.
As the further modification of the present invention,
Its isostatic pressed just base typed pressure 150～2000Mpa in described step 4, control that density is solid density 75～
90%, first base loads evacuation after sintering furnace and is filled with noble gas and protects, and sintering temperature is 800～1000 DEG C, and the time is 2
～5 hours, then cool to less than 50 DEG C with the furnace and come out of the stove.
Further modification as the present invention:
In described step 5, extrusion temperature is 880 DEG C, and extrusion ratio is 100；
In described step 6, combined temp is 800～850 DEG C, and speed is 3～5 ms/min；
Band after heat being combined in described step 7 carries out insulation annealing, uses protective gas to protect, temperature simultaneously
Degree is 500～650 DEG C, and the time is 1～3 hour, and time cold rolling, per pass amount of rolling is less than 20%.
Beneficial effects of the present invention,
1. in ag alloy layer and copper alloy layer, add diadust and nikel powder, account for total amount 0.5～40%, Yi Jishi
Ink, boron, aluminum, silicon, phosphorus, titanium, vanadium, chromium, manganese, ferrum, cobalt, zinc, zirconium, niobium, molybdenum, silver, indium, stannum, antimony, tellurium, hafnium, tantalum, tungsten, rhenium, bismuth,
One or more of metal in scandium, yttrium, lanthanum, cerium, neodymium, ytterbium, lutecium, nonmetal, metal-oxide or nonmetallic compound, to material
The organizational structure of material is optimized, and improves the resistance fusion welding of material and resistance to electrical arc erosion.
2. have employed 3-layer composite material, improve the non-oxidizability of Cu alloy material, reduce the contact resistance of material,
Improve the conductivity of material, reduce the temperature rise of device for switching.
3. use the 3-layer composite material adding additive prepared by aximal deformation value hot composition process, its ag alloy layer and copper
It is firmly combined with between alloy-layer, copper alloy layer and solder layer, and improves the combination property of product because of complex effect, improve
The service life of device for switching.Owing to have employed three layers of combination process, joint silver effect is obvious, and joint silver amount is about 70%, enters one
Step reduces the cost of electrical contact material.
4. reasonable in design due to inventive formulation and technique etc., it is high that the electrical contact material of production has conductivity, contact electricity
Hindering low, even tissue is fine and close, and bond strength is high, and good in oxidation resistance has the spies such as excellent resistance fusion welding and resistance to electrical arc erosion
Point.
Detailed description of the invention
Embodiment one:
Step 1, powder by atomization: include preparing silver metal alloyed powder and copper metal alloy powder.
When preparing silver metal alloy powder or copper metal alloy powders, silver or copper in add aluminum, titanium, vanadium, chromium, manganese, ferrum,
Cobalt, nickel, copper, zinc, zirconium, indium, stannum, antimony, tellurium, bismuth one or both and above metal, or scandium, yttrium, lanthanum, cerium, neodymium, ytterbium, lutecium in
One or both and above rare earth alloy, carry out high melt, smelting temperature is 1030～1450 DEG C, treats its abundant alloying
Make it be atomized into silver metal alloy powder or copper metal alloy powders with water under high pressure afterwards, then dry and cross 50～500 mesh sieves.
Step 1-1 prepares silver metal alloyed powder
When preparing silver metal alloy powder, by silver and added metallic element and rare earth element, carry out high melt, molten
Refining temperature is 1030～1400 DEG C, makes it be atomized into silver alloy powder with water under high pressure after alloying, then dries and crosses 200 mesh
Sieve, the most raw materials used be by mass percentage: silver 98.5%, rare-earth yttrium cerium alloy 0.3%, indium 1% and nickel 0.2%.
Step 1-2 prepares copper metal alloy powder
When preparing copper metal alloy powders, by copper and added metallic element and rare earth element, carry out high melt, molten
Refining temperature is 1030～1400 DEG C, makes it be atomized into copper alloy powder with water under high pressure after alloying, then dries and crosses 200 mesh
Sieve, the most raw materials used be by mass percentage: copper 99.05%, Rare Earth Lanthanum, yttrium, cerium alloy 0.6%, bismuth 0.15% and nickel
0.2%.
Fired for silver metal alloyed powder oxidation processes is obtained siluer metal oxide powder by step 2., and oxidizing temperature is 600
DEG C, oxygen pressure is 3Mpa, and the time is 10 hours.
Step 3., by the silver metal alloy powder of upper step 2 gained, adds graphite, nickel, carborundum, yttrium, oxidation wherein
Lanthanum and diadust, by silver metal alloy 88%, nickel 10%, diamond 1%, lanthana 0.2%, other 0.5%, mixed
Uniformly mixing in sphere of powder grinding machine, the mixed powder time is 8 hours, and ratio of grinding media to material is 20: 1.
The mixture that step 3 is obtained by step 4. is shaped, sinter and obtain ingot blank.Its isostatic pressed just base typed pressure
180Mpa, controlling density is the 75～90% of solid density, and first base loads evacuation after sintering furnace and is filled with noble gas and protects
Protecting, sintering temperature is 900 DEG C, and the time is 3 hours, then cools to less than 50 DEG C with the furnace and comes out of the stove.
Step 5., by above-mentioned obtained ingot blank, is pressed again, extrudes and is rolled.After ingot blank is carried out multiple pressure, it is squeezed into band, so
After to carry out the ag alloy layer electrical contact material that rolling obtains containing additive or metal-oxide more standby.Extrusion temperature is 880 DEG C,
Extrusion ratio is 100.
Step 6. is identical by above-mentioned steps 2,3,4,5 step, prepares copper alloy layer band, and final content is: diamond
Micropowder 1%, lanthanum yttrium cerium 0.9%, bismuth 0.15%, nickel 0.2%, copper 96.75%, other are 1% years old.
Step 7. solder layer uses amorphous brazing filler metal, and preparation technology uses smelting process.By extruding, rolling and annealing process,
It is prepared as band standby.
The composite surface of the silver alloy containing additive, copper alloy and solder band is polished clean by step 8. respectively, then will
It is separately or concurrently combined on hot equipment complex, and its combined temp is 830 DEG C, and speed is 4 ms/min.
Band after heat is combined by step 9. is prepared as joint silver, three layers of composite contact of environment-friendly type through cold rolling, punching etc..?
In the course of processing, protective gas need to be used during band insulation annealing to protect, temperature is 600 DEG C, and the time is 2 hours, cold rolling
Time per pass amount of rolling less than 20%.
Embodiment two:
Difference with embodiment one is:
Step 3: by the silver metal alloy powder of upper step 2 gained, add graphite, nickel, carborundum, yttrium, oxidation wherein
Lanthanum and diadust, by silver metal alloy 90%, nickel 5.7%, diamond 1.2%, lanthana 1.5%, yttrium 0.5%, oxidation
Aluminum 0.2%, zirconium oxide 0.1%, bismuth oxide 0.8%, uniformly mix in mixed sphere of powder grinding machine, the mixed powder time is 8 hours, ratio of grinding media to material
It is 20: 1.
Step 6. is identical by above-mentioned steps 2,3,4,5 step, prepares copper alloy layer band, and final content is: copper:
89%, nickel 3.7%, diamond 1.5%, lanthana 1.5%, yttrium 0.5%, Scia 0.5%, zinc oxide 1%, aluminium oxide
0.1%, zirconium oxide 0.3%, bismuth oxide 1%, lanthanum yttrium cerium alloy 0.9%.
Embodiment three
Difference with embodiment one is:
Step 3: by the silver metal alloy powder of upper step 2 gained, add graphite, nickel, carborundum, yttrium, oxidation wherein
Lanthanum and diadust, by silver metal alloy 96%, nickel 0.5%, diamond 1.5%, lanthana 2%, in mixed sphere of powder grinding machine
Uniformly mixing, the mixed powder time is 8 hours, and ratio of grinding media to material is 20: 1.
Step 6. is identical by above-mentioned steps 2,3,4,5 step, prepares copper alloy layer band, and final content is: copper:
90%, nickel 3%, vanadium 1%, manganese 0.5%, zinc oxide 1%, titanium dioxide 1%, diamond 0.5%, lanthana 1.5%, lanthanum yttrium cerium
Alloy 0.9%, scandium 0.1%, other are 1% years old.
Using the 3-layer composite material containing additive prepared by the present invention, its main performance is as follows:
1. density: >=8.3g/cm3；
2. hardness (HB) >=70；
3. resistivity :≤2.15 μ Ω .cm；
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned enforcement
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications are also
Should be regarded as protection scope of the present invention.
Claims (10)
1. the preparation method of stratiform silver-bearing copper pricker three-layer composite electric contact material prepared by an atomization, it is characterised in that: include
Step 1: use atomization to prepare silver alloy powder and copper alloy powder, and use smelting process to prepare solder；
Step 2: silver alloy powder and copper alloy powder are carried out oxidation processes, obtains silver oxide alloy powder and copper oxide alloys
Powder；
Step 3: by alloy silver powder and the copper alloy powder of step 2 gained, uses powder mixing method, adds additive, and abrasive material mixes
Close, respectively obtain silver alloy and mix powder and copper alloy mixes powder；
Step 4: silver alloy is mixed powder and copper alloy mixes powder and is shaped respectively, sinters and obtain ag alloy layer ingot blank and copper alloy
Layer ingot blank；
Step 5: obtained ag alloy layer ingot blank, copper alloy layer ingot blank, carries out multiple pressure, extrudes and rolling obtains ag alloy layer band
Material, copper alloy layer band；
Step 6: solder is made solder layer band；
Step 7: ag alloy layer band, copper alloy layer band, solder band are sequentially overlapped and carry out hot being combined together；
Step 8: the band after heat being combined is prepared as three layers of composite contact through techniques such as cold rolling, punching.
The preparation side of stratiform silver-bearing copper pricker three-layer composite electric contact material prepared by a kind of atomization the most according to claim 1
Method, it is characterised in that:
Described step 1 is will to add metallic element and rare earth element in silver, carries out high melt, smelting temperature be 1030～
1400 DEG C, after alloying, make it be atomized into silver alloy powder with water under high pressure, then dry and cross 150～250 mesh sieves and obtain silver conjunction
Bronze end；
By adding metallic element and rare earth element in copper, carrying out high melt, smelting temperature is 1030～1400 DEG C, alloying
Make it be atomized into copper alloy powder with water under high pressure afterwards, then dry and cross 150～250 mesh sieves and obtain copper alloy powder.
The preparation of stratiform silver-bearing copper pricker three-layer composite electric contact material prepared by a kind of atomization the most according to claim 1 and 2
Method, it is characterised in that: the oxidizing temperature in described step 2 is 500～700 DEG C, and oxygen pressure is 1～3Mpa, the time be 5～
15 hours.
The preparation side of stratiform silver-bearing copper pricker three-layer composite electric contact material prepared by a kind of atomization the most according to claim 3
Method, it is characterised in that:
During in described step 3, additive is diamond, metal-oxide, nonmetal, nonmetallic compound at least one, mixing side
Formula is ball milling, and the mixed powder time is 6～10 hours, and ratio of grinding media to material is 15～25: 1.
5. the system of the stratiform silver-bearing copper pricker three-layer composite electric contact material prepared according to a kind of atomization described in claim 1 or 2 or 4
Preparation Method, it is characterised in that:
Its isostatic pressed just base typed pressure 150～200Mpa in described step 4, controlling density is the 75～90% of solid density,
After just base loads sintering furnace, evacuation is filled with noble gas and protects, and sintering temperature is 800～1000 DEG C, and the time is 2～5 little
Time, then cool to less than 50 DEG C with the furnace and come out of the stove.
The preparation side of stratiform silver-bearing copper pricker three-layer composite electric contact material prepared by a kind of atomization the most according to claim 5
Method, it is characterised in that: in described step 5, extrusion temperature is 880 DEG C, and extrusion ratio is 100；
In described step 6, combined temp is 800～850 DEG C, and speed is 3～5 ms/min；
Band after heat being combined in described step 7 carries out insulation annealing, uses protective gas to protect simultaneously, and temperature is
500～650 DEG C, the time is 1～3 hour, and time cold rolling, per pass amount of rolling is less than 20%.
7. the preparation method of the stratiform silver-bearing copper pricker three-layer composite electric contact prepared according to a kind of cladding process described in claim 2 or 4,
It is characterized in that: in described step 1 metallic element be magnesium, aluminum, calcium, titanium, vanadium, chromium, manganese, ferrum, cobalt, zinc, zirconium, niobium, molybdenum, silver, indium,
In stannum, antimony, tellurium, hafnium, tantalum, tungsten, rhenium, bismuth and its corresponding oxide at least one；Described rare earth element be scandium, yttrium, lanthanum,
In cerium, neodymium, ytterbium, lutecium and corresponding upper rare earth alloy at least one.
The preparation method of stratiform silver-bearing copper pricker three-layer composite electric contact prepared by a kind of cladding process the most according to claim 6: its
Be characterised by: in described step 3 nonmetal in graphite, boron, silicon, phosphorus at least one, described nonmetallic compound be boron, silicon,
In the compound of phosphorus and carborundum at least one.
The preparation method of stratiform silver-bearing copper pricker three-layer composite electric contact prepared by a kind of cladding process the most according to claim 6:
Metal-oxide in described step 1 and step 3 is SnO2, ZnO, CuO, Fe2O3, CdO, In2O3, Bi2O3, Al2O3,
In MoO3, ZrO2 at least one.
10. the material that prepared by preparation method as described in claim 1 to 9, it is characterised in that:
Including the ag alloy layer set gradually, copper alloy layer, solder layer；
Described ag alloy layer includes that following percetage by weight forms:
Silver 80～99.9%；
Silver layer additive:
In metal, metal-oxide, nonmetal, nonmetallic compound at least one: 0.04～10.3%,
Diadust 0.05～4%,
Rare earth element total amount 0.01～5.7%；
Described copper alloy layer includes that following percetage by weight forms:
Copper 80～99.9%；
Layers of copper additive:
In metal, metal-oxide, nonmetal, nonmetallic compound at least one: 0.04～10.3%,
Diadust 0.05～4%,
Rare earth element total amount 0.01～5.7%；
Described solder layer is silver-bearing copper phosphorus brazing alloy, Ag-Cu-Zn solder or amorphous brazing filler metal.
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| CN106486875A (en) * | 2016-12-20 | 2017-03-08 | 临沂市海纳电子有限公司 | A kind of non-maintaining slip ring of high current high power |
| CN107511469A (en) * | 2017-10-13 | 2017-12-26 | 安阳恒安电机有限公司 | A kind of squirrel cage motor rotor low pressure cast copper equipment, cast copper and its cast copper method |
| CN108220650A (en) * | 2017-12-27 | 2018-06-29 | 昆明贵金属研究所 | A kind of multicomponent oxide enhancing silver-based electric contact material and preparation method thereof |
| CN109454110A (en) * | 2018-10-22 | 2019-03-12 | 吴振江 | Composite metallic material and its manufacturing method |
| CN114914109A (en) * | 2022-04-26 | 2022-08-16 | 浙江省冶金研究院有限公司 | Preparation method of copper-chromium-tellurium-copper-chromium composite contact |
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