CN104889391B - A kind of manufacture method of Ag MeC electrical contacts and its integral component - Google Patents
A kind of manufacture method of Ag MeC electrical contacts and its integral component Download PDFInfo
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- CN104889391B CN104889391B CN201510170631.2A CN201510170631A CN104889391B CN 104889391 B CN104889391 B CN 104889391B CN 201510170631 A CN201510170631 A CN 201510170631A CN 104889391 B CN104889391 B CN 104889391B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 71
- 239000002131 composite material Substances 0.000 claims abstract description 32
- 238000010146 3D printing Methods 0.000 claims abstract description 16
- 238000007493 shaping process Methods 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims description 11
- 229920000642 polymer Polymers 0.000 claims description 11
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 9
- 238000000110 selective laser sintering Methods 0.000 claims description 8
- 239000011812 mixed powder Substances 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000011858 nanopowder Substances 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims description 3
- 238000006731 degradation reaction Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000012805 post-processing Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000011246 composite particle Substances 0.000 claims description 2
- 239000003085 diluting agent Substances 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- RRKGBEPNZRCDAP-UHFFFAOYSA-N [C].[Ag] Chemical compound [C].[Ag] RRKGBEPNZRCDAP-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 4
- UYKQQBUWKSHMIM-UHFFFAOYSA-N silver tungsten Chemical compound [Ag][W][W] UYKQQBUWKSHMIM-UHFFFAOYSA-N 0.000 description 13
- 239000010408 film Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005219 brazing Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000004425 Makrolon Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000013039 cover film Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Powder Metallurgy (AREA)
- Contacts (AREA)
- Manufacture Of Switches (AREA)
Abstract
The present invention relates to the manufacture method of a kind of Ag MeC electrical contacts and its integral component, the silver-colored carbide composite powder of overlay film is prepared first and is fitted into 3D printer powder cylinder, then the threedimensional model of silver-colored carbide electrical contact and its integral component is set up by computer, the 3D printing shaping of silver-colored carbide electrical contact and its integral component is completed.The present invention realizes that silver-colored carbide electrical contact and its integral component expect the direct rapid shaping of finished product from former material by 3D printing, save raw material and production cost, it can realize that zero inventory, zero-time are delivered simultaneously, be a kind of new method for preparing silver-colored carbide electrical contact and its integral component.
Description
Technical field
The present invention relates to a kind of electrical contact and its forming method of integral component, specifically, a kind of Ag- is referred to
The 3D printing forming method of MeC electrical contacts and its integral component.
Background technology
Electrical contact and its integral component are the industrial base components such as motor, electrical equipment, instrument and meter, electronics, while it
The characteristics of being also core parts, electrical contact and its integral component is：Small volume, it is complex-shaped, and require wide in variety, specification
Entirely, performance is high, and its quality directly affects the performance of low-voltage electrical apparatus.Manufacture high-quality electrical contact and its integral component can be significantly
Save the energy and raw material.So the kind of electrical contact and its integral component, quality, technology level turn into motor,
One of mark of the industrial products performance level such as electrical equipment.But prepare high-quality, various in style, complex-shaped various electrical contact
And its integral component needs the complicated Processes and apparatus of many sets, floor space is big, causes high production cost.Integrally simultaneously
Change component influences the electric property and mechanical property of integral component due to a series of problems of electrical contact and tactile bridge combination interface
Can, and then influence the reliability of low-voltage electrical apparatus.To reduce cost, integral component combination interface quality is improved, is constantly had new
Electrical contact and its integral component preparation technology are developed.
Research both at home and abroad in terms of electrical contact and its integral component preparation technology is specific as follows：
2) Chinese invention patent：Cold pressure welding compound rivet contacts and manufacture method, application number：
200910053737.9, publication number：CN101587788A.
2) Chinese invention patent：The manufacture method of triple-layer composite cold-rolling welded rivet contact, application number：
200710036330.6, publication number：CN101030491A.
3) Chinese invention patent：The igniter of firing tip with induction welding and laser welding and its manufacturer
Method, application number：200880114019.1, publication number：CN101842948A.
The technology of preparing of any of the above electrical contact and its integral component has all saved noble metal raw material to a certain extent,
The preparation technology flow of electrical contact is simplified, cost of material and production cost is reduced, while also improving in integral component
The combination interface quality of electrical contact and tactile bridge, but it can not still reach the production that finished product is directly expected from former material, still need to multistep work
Skill could be completed.
The content of the invention
There is provided a kind of brand-new Ag-MeC electrical contacts and its integration for deficiency of the invention for the presence of above-mentioned prior art
The preparation method of component --- 3D printing forming method, Ag-MeC electricity is realized using the Selective Laser Sintering in 3D printing
Contact and its integral component expect the quick straight forming of finished product from former material, reduce production cost, and further improve one
Change the combination interface quality that bridge and Ag-MeC electrical contacts are touched in component, improve its electric property and mechanical property；Realize Ag-MeC
The zero inventory of electrical contact and its integral component, zero-time deliver, and then reduce inventory cost.
To realize above-mentioned purpose, the 3D printing shaping side of Ag-MeC electrical contacts and its integral component of the present invention
Method, comprises the following steps：
The first step, carries out powder processed, and use chemical silvering to carbide powder according to the component requirements of Ag-MeC electrical contacts
Or compound electric is silver-plated is pre-processed, then require that silver-carbide is made in dispensing, mixed powder according to Ag-MeC electrical contacts composition proportion
Composite powder；
Second step, overlay film silver-carbide is made by binding agent of high molecular polymer by silver-carbide composite powder and is combined
Powder, overlay film silver-carbide composite powder is encased in 3D printer powder cylinder；
3rd step, sets up the threedimensional model of Ag-MeC electrical contacts and its integral component, utilizes selective laser sintering skill
Art carries out the 3D printing shaping of Ag-MeC electrical contacts and its integral component, obtains moulded blank.
As a preferred embodiment, in the first step：Silver powder is the mixing of nano powder and powder and micron, silver-carbonization material
Amount proportioning is 60：40~35：65.In this step, silver powder uses the mixing of nano powder and powder and micron, because the fusing point of nano-silver powder
Low, micro-silver powder fusing point is high, and using both mixed powders, the nano-silver powder first melted is filled into unfused micro-silver powder,
The problem of 3D printing Ag-MeC electrical contacts and its integral component voidage are high, interface quality is poor can be solved.
As a preferred embodiment, in the second step：The particle diameter of overlay film silver-carbide composite powder is 1~50 μm.Will be poly-
Compound binding agent is diluted with diluent, after stirring, and silver-carbide composite powder is put into wherein, is continuously agitated, allows
Polymer fully wraps up silver-carbide composite powder, and re-dry solidifies binding agent, obtains overlay film silver-carbide composite powder, should
Composite powder concrete structure is after silver-carbide composite particles Surface coating one layer of polymeric binding agent and coalesced together.
As a preferred embodiment, in the 3rd step：Selective laser sintering and moulding is a kind of heat treatment process, herein
During occur a series of physical and chemical changes, mainly have the generation and conduction, the differentiation of microstructure, fluid of heat
Influence and the change of mechanical tissue, powder become powder agglomerate by granular aggregation, so as to form required Ag-
MeC electrical contacts and its integral component.The influence of heat problem is topmost in the problem of this is a series of.Swash in metal dust
In light sintering, heat is entirely to be preheated to produce by the energy and powder of laser, and various technological parameters together decide on laser
Energy density, most important technological parameter includes laser power, sweep speed, sweep span and lift height etc..The present invention
First pass through metal powder sintered temperature field numerical simulation analysis influence quantity of sintered parts more than each technological parameter and its
With relation, and further determine 13~15W of laser power, 1800~2000mm/s of sweep speed, scanning room by the way that experiment is final
Away from 0.1~0.16mm, 0.1~0.14mm of lift height.
As a preferred embodiment, the present invention performs the 4th step after the 3rd step：Moulded blank is post-processed with
Obtain closely knit Ag-MeC electrical contacts and its integral component.
Preferably, in the 4th step：Powder unnecessary in moulded blank is removed, further after cleaning polishing, also needed
Moulded blank is for further processing, now moulded blank experienced three stages：Degradation polymer, double sintering and metallic cementation,
The three phases can be carried out in same heating furnace, and protective atmosphere is 30% hydrogen, and 70% nitrogen, percentage here contains
Amount refers to volumn concentration.
The present invention manufactures Ag-MeC electrical contacts and its integral component using 3D printing technique, on the one hand using powder surface
Cladding organic polymer come solve Ag materials because thermal conductivity is high and laser reflectivity high and caused by printing problem；On the other hand adopt
The method mixed with Ag nano powders with powder and micron solves 3D printing Ag-MeC electrical contacts and its integral component voidage height, interface
The problem of bond quality is poor.
Compared with prior art, the invention has the advantages that：Using the particular advantages of 3D printing technique, it can make
The complicated Ag-MeC electrical contacts of planform and its integral component are made without increasing cost；A variety of Ag-MeC electricity can be manufactured to touch
Head and its component are without increasing production line；Because 3D printing is increasing material manufacturing, the waste of raw material is not resulted in；Due to without production
Line and 3D printer small volume, floor space are small, it is possible to decrease production cost；Zero inventory, zero-time can be achieved to deliver.Simultaneously can be with
The complete integral component of manufacture and the electric conductivity for improving integrated element.
Brief description of the drawings
Fig. 1 is principle schematic diagram of the present invention.
Embodiment
Embodiments of the invention are elaborated below, following examples give detailed embodiment and specific
Operating process, but protection scope of the present invention is not limited to following embodiments.
As shown in figure 1, in device and its principle signal that the present invention is used, figure：1. laser, 2. laser beam scanners,
3. laser beam, 4.ZnSe windows, 5.AgMeC electrical contacts and its integral component, 6. moulding cylinders, 7. working pistons, 8. powder cylinders,
9. powder feeding piston, 10. powder-laying rollers.Its operation principle：Whole process unit is mainly made up of moulding cylinder 6 and powder cylinder 8, and work is opened
Powder feeding piston 9 rises during the beginning, is uniformly spread overlay film silver-carbide composite powder on tactile bridge on working piston 7 by powder-laying roller 10
Last layer, computer controls the two-dimensional scan track of laser beam 3 according to the hierarchical model of prototype, selectively sintering solid powder
Material is to form an aspect of Ag-MeC electrical contacts and its integral component 5Ag-MeC electrical contacts.Powder is completed after one layer, work
Make piston 7 and decline a thickness, powder-laying roller 10 spreads new powder, and control laser beam 3 scans the new layer of sintering again.So move in circles,
It is layering, until Ag-MeC electrical contacts and its integral component 5 are molded.Finally, to unsintered Powder Recovery to powder cylinder
In, and take out moulded blank.
Embodiment 1
Exemplified by printing Ag60WC40 electrical contacts and its integral component
The first step, prepares silver, tungsten carbide powder, tungsten carbide powder is pre-processed using chemical silvering respectively, and press it is silver-colored-
Tungsten carbide quality proportioning is 60:40, which carry out mixed powder, is made silver-tungsten carbide composite powder.
Second step, by silver-tungsten carbide composite powder, by binding agent of high molecular polymer, (polymer used here is mainly
Thermoplastic, such as makrolon (PC), nylon (PA)) overlay film silver-tungsten carbide composite powder that particle diameter is 1 μm is made.It will cover
Film silver-tungsten carbide composite powder is encased in 3D printer powder cylinder.
3rd step, sets up the threedimensional model of Ag60WC40 electrical contacts and its integral component, utilizes selective laser sintering
Technology carries out the 3D printing shaping of Ag60WC40 electrical contacts and its integral component, and laser power is 13W, and sweep speed is
1800mm/s, sweep span is 0.1mm, and lift height is 0.1mm, obtains Ag60WC40 electrical contacts and its integral component.
Embodiment 2
Exemplified by printing Ag50WC50 electrical contacts and its integral component
The first step, prepares silver, tungsten carbide powder, tungsten carbide powder is pre-processed using chemical silvering respectively, and press it is silver-colored-
Tungsten carbide quality proportioning is 50:50, which carry out mixed powder, is made silver-tungsten carbide composite powder.
Second step, by silver-tungsten carbide composite powder be made by binding agent of high molecular polymer overlay film that particle diameter is 10 μm silver-
Tungsten carbide composite powder.Overlay film silver-tungsten carbide composite powder is encased in 3D printer powder cylinder.
3rd step, sets up the threedimensional model of Ag50WC50 electrical contacts and its integral component, utilizes selective laser sintering
Technology carries out the 3D printing shaping of Ag50WC50 electrical contacts and its integral component, and laser power is 14W, and sweep speed is
1900mm/s, sweep span is 0.13mm, and lift height is 0.12mm.
4th step, cleaning polishing and secondary heat treatment etc. post processing are carried out to moulded blank to obtain high intensity, high accuracy
And the Ag50WC50 electrical contacts and its integral component of contact-touch bridge combination interface quality good (ratio of brazing area up to more than 99%).
Embodiment 3
Exemplified by printing Ag35WC65 electrical contacts and its integral component
The first step, prepares silver, tungsten carbide powder respectively, and tungsten carbide powder is pre-processed using compound electric is silver-plated, and presses
Silver-tungsten carbide quality proportioning is 35:65, which carry out mixed powder, is made silver-tungsten carbide composite powder.
Second step, by silver-tungsten carbide composite powder be made by binding agent of high molecular polymer overlay film that particle diameter is 50 μm silver-
Tungsten carbide composite powder.Overlay film silver-tungsten carbide composite powder is encased in 3D printer powder cylinder.
3rd step, sets up the threedimensional model of Ag35WC65 electrical contacts and its integral component, utilizes selective laser sintering
Technology carries out the 3D printing shaping of Ag35WC65 electrical contacts and its integral component, and laser power is 15W, and sweep speed is
2000mm/s, sweep span is 0.16mm, and lift height is 0.14mm.
4th step, cleaning polishing and secondary heat treatment etc. post processing are carried out to moulded blank to obtain high intensity, high accuracy
And the Ag35WC65 electrical contacts and its integral component of contact-touch bridge interface quality good (ratio of brazing area up to more than 99%).
Although present disclosure is discussed in detail by above-described embodiment, but it should be appreciated that the description above
It is not considered as limitation of the present invention.After those skilled in the art have read the above, for a variety of of the present invention
Modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (9)
1. the manufacture method of a kind of Ag-MeC electrical contacts and its integral component, it is characterised in that comprise the following steps：
The first step, carries out powder processed, and carbide powder is adopted according to the component requirements of Ag-MeC electrical contacts and its integral component
Pre-processed with chemical silvering or compound electric are silver-plated, then will according to Ag-MeC electrical contacts and its integral component composition proportion
Ask dispensing, mixed powder that silver-carbide composite powder is made；
Second step, overlay film silver-carbide composite powder is made by binding agent of high molecular polymer by silver-carbide composite powder, will
Overlay film silver-carbide composite powder is encased in 3D printer powder cylinder；
3rd step, is set up the threedimensional model of Ag-MeC electrical contacts and its integral component, is entered using Selective Laser Sintering
The 3D printing shaping of row Ag-MeC electrical contacts and its integral component, obtains moulded blank.
2. the manufacture method of Ag-MeC electrical contacts according to claim 1 and its integral component, it is characterised in that：It is described
In the first step：Silver, carbide quality proportioning are 60/40~35/65 in silver-carbide.
3. the manufacture method of Ag-MeC electrical contacts according to claim 2 and its integral component, it is characterised in that：It is described
In the first step：Silver powder is the mixing of nano powder and powder and micron.
4. the manufacture method of Ag-MeC electrical contacts according to claim 1 and its integral component, it is characterised in that：It is described
In second step：The particle diameter of overlay film silver-carbide composite powder is 1~50 μm.
5. the manufacture method of Ag-MeC electrical contacts according to claim 4 and its integral component, it is characterised in that：It is described
In second step：Polymeric binder is diluted with diluent, after stirring, silver-carbide composite powder be put into wherein,
It is continuously agitated, allows polymer fully to wrap up silver-carbide composite powder, re-dry solidifies binding agent, obtains overlay film silver-carbon
Compound composite powder, the composite powder structure is after silver-carbide composite particles Surface coating one layer of polymeric binding agent and is flocked on
Together.
6. the manufacture method of Ag-MeC electrical contacts according to claim 1 and its integral component, it is characterised in that：It is described
In 3rd step：Each parameter and its matching of quantity of sintered parts are influenceed by the numerical simulation analysis in metal powder sintered temperature field
Relation, Selective Laser Sintering parameter is：13~15W of laser power, 1800~2000mm/s of sweep speed, sweep span
0.1~0.16mm, 0.1~0.14mm of lift height.
7. the manufacture method of the Ag-MeC electrical contacts and its integral component according to claim any one of 1-6, its feature
It is：After the 3rd step, the 4th step is performed：Moulded blank is post-processed with obtain closely knit Ag-MeC electrical contacts and its
Integral component.
8. the manufacture method of Ag-MeC electrical contacts according to claim 7 and its integral component, it is characterised in that：It is described
Post processing, refers to：Powder unnecessary in moulded blank is removed, further after cleaning polishing, makees further place to moulded blank
Manage, now moulded blank experienced three stages：Degradation polymer, double sintering and metallic cementation.
9. the manufacture method of Ag-MeC electrical contacts according to claim 8 and its integral component, it is characterised in that：It is described
Degradation polymer, double sintering and metallic cementation three phases are carried out in same heating furnace, and protective atmosphere is 30% hydrogen,
70% nitrogen.
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| CN106608726A (en) * | 2015-10-26 | 2017-05-03 | 优克材料科技股份有限公司 | Three-dimensional printing method and three-dimensional printing powder |
| CN109797307B (en) * | 2019-01-09 | 2020-08-11 | 东南大学 | Ag/C @ Ti3AlC2Preparation method of contact material |
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| CN1958196A (en) * | 2006-09-21 | 2007-05-09 | 中北大学 | Fast method for preparing high temperature component parts in composite material of molybdenum and copper |
| CN101834070A (en) * | 2009-03-13 | 2010-09-15 | 上海电科电工材料有限公司 | AgWC (wolfram carbide) electrical contact material and manufacturing method thereof |
| CN103290359A (en) * | 2013-06-08 | 2013-09-11 | 西安工程大学 | Preparation method of silver tungsten carbide contact alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9776282B2 (en) * | 2012-10-08 | 2017-10-03 | Siemens Energy, Inc. | Laser additive manufacture of three-dimensional components containing multiple materials formed as integrated systems |
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| CN1958196A (en) * | 2006-09-21 | 2007-05-09 | 中北大学 | Fast method for preparing high temperature component parts in composite material of molybdenum and copper |
| CN101834070A (en) * | 2009-03-13 | 2010-09-15 | 上海电科电工材料有限公司 | AgWC (wolfram carbide) electrical contact material and manufacturing method thereof |
| CN103290359A (en) * | 2013-06-08 | 2013-09-11 | 西安工程大学 | Preparation method of silver tungsten carbide contact alloy |
| CN103824710A (en) * | 2014-03-10 | 2014-05-28 | 温州中希电工合金有限公司 | Method for preparing silver-tungsten carbide contact material from silver-coated tungsten carbide powder and silver-tungsten carbide contact material |
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