CN101886185A - Method for preparing copper-chrome alloy casting blank - Google Patents
Method for preparing copper-chrome alloy casting blank Download PDFInfo
- Publication number
- CN101886185A CN101886185A CN 201010224766 CN201010224766A CN101886185A CN 101886185 A CN101886185 A CN 101886185A CN 201010224766 CN201010224766 CN 201010224766 CN 201010224766 A CN201010224766 A CN 201010224766A CN 101886185 A CN101886185 A CN 101886185A
- Authority
- CN
- China
- Prior art keywords
- copper
- alloy
- chromium
- chrome
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a method for preparing a copper-chrome alloy casting blank for manufacturing a copper-chrome alloy material. The copper-chrome alloy material contains the following metal components in percentage by weight: 25 percent of chrome, 0.5 to 3 percent of third component and the balance of copper, wherein the third components is any one of tungsten, cobalt, niobium and tantalum. The preparation method comprises the following processes of: melting the copper, the chrome and the metal of the third component in a vacuum induction furnace in a predetermined weight ratio to form an alloy liquid phase, wherein the vacuum degree in the furnace is less than 1*10<-1>Pa, and the temperature in the furnace is between 1,800 and 2,000 DEG C; then introducing argon into the furnace, keeping the pressure between 10 and 50kPa, and stirring and refining the alloy liquid phase for 20 minutes; and finally, casting the alloy liquid phase to form the casting blank in a water-cooled die at the temperature of between 1,800 and 1,900 DEG C. The copper-chrome alloy, which is manufactured by adopting a vacuum fusion casting method, has the advantages of compact tissue, fine and uniform grains, low gas content and high electric conductivity; and the method is particularly suitable for manufacturing various electrical appliance contact materials.
Description
Technical field:
The present invention relates to a kind of castmethod of alloy material, relate in particular to a kind of preparation method who is used for the copper-chrome alloy casting blank of electrical contact.
Background technology:
Chromiumcopper (as CuCr25) material is that electrovacuum material field is the most representative, uses one of the most successful contact material.The development of high-power, high pressure, high reliability and long-life electron tube and high and low voltage electric distribution complexes requires contact material to have better physics performance of science and electrical property.Studies show that in a large number, suitable material alloysization can significantly be improved the tissue and the performance of copper chromium base contact material, thereby become the important directions that copper chromium base contact material develops, especially producing equipment condition in China also still has under the situation of big gap with developed country.
Studies show that, in copper-chromium contact material, add separately or compound interpolation elemental tungsten (W), cobalt (Co), niobium (Nb) and tantalum (Ta), the physical strength and the hardness of chromiumcopper material is improved in the capital, and the chromium phase in the reinforced alloys tissue is improved the electric withstand voltage and break performance of contact.Yet in copper-chromium contact material, add the constituent element of other elements, promptly during the 3rd constituent element, the 3rd constituent element that is added must be distributed in the alloy in homodisperse mode, if the element constituent element that adds distributes inhomogeneously, the interpolation element that will cause chromium in the alloy to depend on reunion is grown up, form the segregation of chromium phase, thereby cause the chromiumcopper performance decrease.In order to make the 3rd constituent element homodisperse that adds, generally adopt powder metallurgic method and infiltration method at present.
Powder metallurgic method is by a certain percentage, with copper powder, chromium powder and the 3rd constituent element powder thorough mixing, press forming under protective atmosphere of certain particle size, and under protective atmosphere sintering.Powder metallurgic method is fairly simple, and alloying constituent is easy to control, but size between the chromium particle and spacing are excessive, and homogeneity of structure is lower, and oxygen and nitrogen content are too high in the contact material of this method preparation, has reduced the electric current breaking capacity of contact.
Infiltration method is with pure chromium powder or is mixed with a small amount of copper powder and the chromium powder of the 3rd constituent element powder compacting and sintering are made the infiltration skeleton, about 1200 ℃ infiltration of copper entered the chromium skeleton in temperature under vacuum condition, thereby make the chromiumcopper material.The advantage of this technology is to carry out hydrogen reducing or vacuum carbothermal reduction in sintering chromium skeleton process, and the oxygen in the chromium powder raw material is reduced greatly, thereby obtains the very low quality products of oxygen level.But the shortcoming of this method is, easily produce infiltration defectives such as closed pore in process of production, and chromium solubleness in copper is higher when the high temperature infiltration, can forms supersaturated solid solution after the cooling, make it the conductivity performance and reduce greatly, infiltration method can not be produced high-copper chromiumcopper in addition.
In a word, each preparation technology and the operative technique thereof of existing copper-chrome alloy casting blank all have certain degree of difficulty separately, and the performance of preparation gained material also awaits further raising.
Summary of the invention:
Technical problem to be solved by this invention is the deficiency that overcomes the preparation method who has the chromiumcopper that is used for electrical contact now, a kind of preparation method of copper-chrome alloy casting blank is provided, it adopts vacuum casting and water cooled mo(u)ld refrigerative method manufactured copper chromium alloy material, with the purpose that alloy material dense structure, crystal grain are tiny evenly, gas content is low, specific conductivity is high that reaches preparation.
Solution of the above problems of the present invention is as follows:
A kind of preparation method of copper-chrome alloy casting blank, the blank that is used for the manufactured copper chromium alloy material, the weight ratio of the contained metal ingredient of this chromiumcopper material is: chromium 25%, the 3rd constituent element 0.5-3%, copper is surplus, and the 3rd constituent element is any in tungsten, cobalt, niobium or the tantalum, it is characterized in that: the metal with copper, chromium and the 3rd constituent element is fused into alloy liquid phase according to predetermined weight than in vacuum induction furnace earlier, pass through argon filling, pressurize, stirring, refining then, in water cooled mo(u)ld, be cast into strand at last.
The preparation method's of copper-chrome alloy casting blank of the present invention processing step is as follows:
(1) metal with copper, chromium and the 3rd constituent element adds vacuum induction furnace according to predetermined weight ratio of constituents, and the vacuum induction stove evacuation reaches the interior vacuum tightness of stove less than 1 * 10 then
-1Pa, and temperature arrives 1800-2000 ℃ in the process furnace;
(2) treat that metal melts fully in all stoves after, charging into argon gas and keep furnace pressure in vacuum induction furnace is 10-50kPa;
(3) to metal in the stove stir, refining forms the alloy liquation, lasts 20 minutes;
(4) the alloy liquation that is refined into is injected water cooled mo(u)ld casting strand, in casting cycle this water cooled mo(u)ld around feed recirculated cooling water all the time, pouring temperature remains on 1800-1900 ℃.
Compare with powder metallurgic method and infiltration method; the preparation method of copper-chrome alloy casting blank of the present invention uses vacuum casting manufactured chromiumcopper material; adopt protection melting of high vacuum and inert gas argon and cast alloys; make the gas content in the chromiumcopper obtain better controlled; particularly greatly reduce the content of oxygen; thereby improved the conductivity performance and the electric current breaking capacity of material, its specific conductivity has improved 30% at least than common chromiumcopper material.In addition, owing in chromiumcopper, added tungsten, cobalt, forming core such as niobium or tantalum element is as the 3rd constituent element, therefore help grain growing and refinement, the present invention has simultaneously adopted water cooled mo(u)ld that cast alloys is quickened cooling, therefore can make the alloy liquation keep certain setting rate, the segregation of large-scale chromium can not appear, thereby when making high temperature in the liquid alloy uniform mixing state of each constituent element remain to cooled solid-state, wherein the chromium particle is more tiny, it is more even to distribute, the metallographic structure measurement shows, the chromium granular size is below the 6-15 micron in the chromiumcopper material of employing the present invention preparation, with this contact material dense structure for preparing, performance has obtained bigger improvement.
Description of drawings:
Fig. 1 is a process flow sheet of the present invention.
Fig. 2 is the metallographic structure figure of the chromiumcopper material of powder metallurgic method preparation.
Fig. 3 is the metallographic structure figure of the chromiumcopper material of infiltration method preparation.
Fig. 4 is the metallographic structure figure of the chromiumcopper material for preparing of the present invention.
Embodiment:
The preparation method of copper-chrome alloy casting blank of the present invention is used for the blank of manufactured copper chromium alloy material, this chromiumcopper material is applied to make the contact of electrical equipment, its alloying constituent is based on copper (Cu), chromium (Cr), add the third metal constituent element again, the weight ratio of the contained metal ingredient of this chromiumcopper material is: chromium 25%, the 3rd constituent element 0.5-3%, copper are surplus, and the 3rd constituent element is any in tungsten (W), cobalt (Co), niobium (Nb) or the tantalum (Ta).In the copper croloy, add forming core elements such as tungsten, cobalt, niobium or tantalum and help the growth and the refinement of crystal grain, the general note of such alloy is made CuCr25Me (Me=W, Nb, Ta or Co) as the 3rd constituent element.
The preparation method of described copper-chrome alloy casting blank adopts vacuum casting manufactured chromiumcopper material, metal with copper, chromium and the 3rd constituent element is fused into alloy liquid phase according to predetermined weight than in vacuum induction furnace earlier, pass through argon filling, pressurize, stirring, refining then, in water cooled mo(u)ld, be cast into strand at last.
The present invention is described in further detail below in conjunction with accompanying drawing, embodiment and experimental result.
Embodiment 1---
Prepare copper-chrome alloy casting blank according to as shown in Figure 1 processing method step of the present invention:
(1) with copper, chromium and as the metal niobium of the 3rd constituent element according to weight ratio of constituents: chromium 25%, niobium 0.5%, copper are that surplus is prepared burden, and add vacuum induction furnace then; The vacuum induction stove evacuation reaches the interior vacuum tightness of stove less than 1 * 10 afterwards
-1Pa, and temperature to 1850 ℃ in the process furnace.
(2) vacuum induction furnace is in the heat temperature raising process, and metal progressively melts according to the different melting points of each constituent element in the stove, and at first fusing is copper; After treating that metal melts fully in all stoves, in vacuum induction furnace, charge into the rare gas element argon gas, and the maintenance furnace pressure is 50kPa.
(3) under the condition of argon filling, pressurize, to metal in the stove stir, refining forms the alloy liquation, lasts 20 minutes.
(4) then the alloy liquation that is refined into is injected water cooled mo(u)ld to cast strand, this water cooled mo(u)ld is the shaping mould of strand, and its die cavity periphery is provided with cooling water circulation passage; All the time feed recirculated cooling water in the cooling-water duct in alloy liquation casting cycle around this water cooled mo(u)ld, pouring temperature remains on 1800 ℃.
The CuCr25Nb alloy material that the method for employing the invention described above is prepared, its physics and mechanical property see Table 1 after tested.
The physics and the mechanical property of table 1CuCr25Nb alloy material
Table 10 has been listed the material property of the CuCr25 of homemade CuCr50 and US Westinghouse company's production.
The physics and the mechanical property of the homemade and import chromiumcopper material of table 10
From the contrast of table 1 and table 10 as can be known, improved more than 30% than common CuCr25 material, improved nearly one times than CuCr50 material with the copper chromium conductivity of electrolyte materials of the present invention's preparation; Gas content is also much lower than common CuCr25 material, especially oxygen level; From density of material, the material compactness of the present invention's preparation is fine, and this is very important to improving the material use properties.Can find out by metallographic structure figure shown in Figure 4, in the chromiumcopper material of the present invention preparation the chromium particle not only be evenly distributed and also particle size tiny, much smaller than the chromiumcopper material of producing with powder metallurgic method and infiltration method shown in Fig. 2 and Fig. 3 metallographic structure figure.
Embodiment 2---
Adopt method of the present invention to prepare the CuCr25Nb alloy material, its processing method step is except that following content, and all the other are substantially the same manner as Example 1:
(1) according to weight ratio of constituents: chromium 25%, niobium 3%, copper are that surplus is prepared burden, and temperature is heated to 2000 ℃ in the stove.
(2) charge in the vacuum induction furnace that to keep furnace pressure behind the argon gas be 30kPa.
(3) pouring temperature remains on 1800 ℃.
The CuCr25Nb alloy material that adopts method for preparing to go out, its physics and mechanical property see Table 2 after tested.
The physics and the mechanical property of table 2CuCr25Nb alloy material
Embodiment 3---
Adopt method of the present invention to prepare the CuCr25Nb alloy material, its processing method step is except that following content, and all the other are substantially the same manner as Example 1:
(1) according to weight ratio of constituents: chromium 25%, niobium 1%, copper are that surplus is prepared burden, and temperature is heated to 1900 ℃ in the stove.
(2) charge in the vacuum induction furnace that to keep furnace pressure behind the argon gas be 10kPa.
(3) pouring temperature remains on 1850 ℃.
The CuCr25Nb alloy material that adopts method for preparing to go out, its physics and mechanical property see Table 3 after tested.
The physics and the mechanical property of table 3CuCr25Nb alloy material
Embodiment 4---
Adopt method of the present invention to prepare the CuCr25W alloy material, its processing method step is except that following content, and all the other are substantially the same manner as Example 1:
(1) according to weight ratio of constituents: chromium 25%, tungsten 1%, copper are that surplus is prepared burden, and temperature is heated to 2000 ℃ in the stove.
(2) charge in the vacuum induction furnace that to keep furnace pressure behind the argon gas be 50kPa.
(3) pouring temperature remains on 1900 ℃.
The CuCr25W alloy material that adopts method for preparing to go out, its physics and mechanical property see Table 4 after tested.
The physics and the mechanical property of table 4CuCr25W alloy material
Embodiment 5---
Adopt method of the present invention to prepare the CuCr25W alloy material, its processing method step is except that following content, and all the other are substantially the same manner as Example 1:
(1) according to weight ratio of constituents: chromium 25%, tungsten 2%, copper are that surplus is prepared burden, and temperature is heated to 2000 ℃ in the stove.
(2) charge in the vacuum induction furnace that to keep furnace pressure behind the argon gas be 10kPa.
(3) pouring temperature remains on 1900 ℃.
The CuCr25W alloy material that adopts method for preparing to go out, its physics and mechanical property see Table 5 after tested.
The physics and the mechanical property of table 5CuCr25W alloy material
Embodiment 6---
Adopt method of the present invention to prepare the CuCr25Co alloy material, its processing method step is except that following content, and all the other are substantially the same manner as Example 1:
(1) according to weight ratio of constituents: chromium 25%, cobalt 1%, copper are that surplus is prepared burden, and temperature is heated to 2000 ℃ in the stove.
(2) charge in the vacuum induction furnace that to keep furnace pressure behind the argon gas be 10kPa.
(3) pouring temperature remains on 1900 ℃.
The CuCr25Co alloy material that adopts method for preparing to go out, its physics and mechanical property see Table 6 after tested.
The physics and the mechanical property of table 6CuCr25Nb alloy material
Embodiment 7---
Adopt method of the present invention to prepare the CuCr25Co alloy material, its processing method step is except that following content, and all the other are substantially the same manner as Example 1:
(1) according to weight ratio of constituents: chromium 25%, cobalt 3%, copper are that surplus is prepared burden, and temperature is heated to 2000 ℃ in the stove.
(2) charge in the vacuum induction furnace that to keep furnace pressure behind the argon gas be 50kPa.
(3) pouring temperature remains on 1900 ℃.
The CuCr25Co alloy material that adopts method for preparing to go out, its physics and mechanical property see Table 7 after tested.
The physics and the mechanical property of table 7CuCr25Co alloy material
Embodiment 8---
Adopt method of the present invention to prepare the CuCr25Ta alloy material, its processing method step is except that following content, and all the other are substantially the same manner as Example 1:
(1) according to weight ratio of constituents: chromium 25%, tantalum 1%, copper are that surplus is prepared burden, and temperature is heated to 2000 ℃ in the stove.
(2) charge in the vacuum induction furnace that to keep furnace pressure behind the argon gas be 10kPa.
(3) pouring temperature remains on 1900 ℃.
The CuCr25Ta alloy material that adopts method for preparing to go out, its physics and mechanical property see Table 8 after tested.
The physics and the mechanical property of table 8CuCr25Ta alloy material
Embodiment 9---
Adopt method of the present invention to prepare the CuCr25Ta alloy material, its processing method step is except that following content, and all the other are substantially the same manner as Example 1:
(1) according to weight ratio of constituents: chromium 25%, tantalum 2%, copper are that surplus is prepared burden, and temperature is heated to 2000 ℃ in the stove.
(2) charge in the vacuum induction furnace that to keep furnace pressure behind the argon gas be 40kPa.
(3) pouring temperature remains on 1850 ℃.
The CuCr25Ta alloy material that adopts method for preparing to go out, its physics and mechanical property see Table 9 after tested.
The physics and the mechanical property of table 9CuCr25Ta alloy material
The foregoing description is the portion-form that the present invention uses, and protection domain of the presently claimed invention is not limited only to this, comprises that also other are to the conspicuous conversion of content of the present invention and alternative.
Claims (2)
1. the preparation method of a copper-chrome alloy casting blank, the blank that is used for the manufactured copper chromium alloy material, the weight ratio of the contained metal ingredient of this chromiumcopper material is: chromium 25%, the 3rd constituent element 0.5-3%, copper is surplus, the 3rd constituent element is any in tungsten, cobalt, niobium or the tantalum, it is characterized in that: the metal with copper, chromium and the 3rd constituent element is fused into alloy liquid phase according to predetermined weight than in vacuum induction furnace earlier, pass through argon filling, pressurize, stirring, refining then, in water cooled mo(u)ld, be cast into strand at last.
2. the preparation method of copper-chrome alloy casting blank according to claim 1, it is characterized in that: the processing step of described method is as follows:
(1) metal with copper, chromium and the 3rd constituent element adds vacuum induction furnace according to predetermined weight ratio of constituents, and the vacuum induction stove evacuation reaches the interior vacuum tightness of stove less than 1 * 10 then
-1Pa, and temperature arrives 1800-2000 ℃ in the process furnace;
(2) treat that metal melts fully in all stoves after, charging into argon gas and keep furnace pressure in vacuum induction furnace is 10-50kPa;
(3) to metal in the stove stir, refining forms the alloy liquation, lasts 20 minutes;
(4) the alloy liquation that is refined into is injected water cooled mo(u)ld casting strand, in casting cycle this water cooled mo(u)ld around feed recirculated cooling water all the time, pouring temperature remains on 1800-1900 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010224766 CN101886185A (en) | 2010-07-13 | 2010-07-13 | Method for preparing copper-chrome alloy casting blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010224766 CN101886185A (en) | 2010-07-13 | 2010-07-13 | Method for preparing copper-chrome alloy casting blank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101886185A true CN101886185A (en) | 2010-11-17 |
Family
ID=43072275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010224766 Pending CN101886185A (en) | 2010-07-13 | 2010-07-13 | Method for preparing copper-chrome alloy casting blank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101886185A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644042A (en) * | 2012-04-11 | 2012-08-22 | 燕山大学 | Method for increasing electric conductivity of copper-chromium alloy |
| CN104480346A (en) * | 2014-12-25 | 2015-04-01 | 春焱电子科技（苏州）有限公司 | Tantalum contained copper alloy for electronic material |
| CN105755309A (en) * | 2016-03-28 | 2016-07-13 | 西安建筑科技大学 | Technology for preparing copper-chromium contact material by extruding large ingot |
| CN107586977A (en) * | 2017-08-24 | 2018-01-16 | 西安理工大学 | A kind of preparation method of copper alloy with high strength and high conductivity bar |
| CN110512114A (en) * | 2019-08-31 | 2019-11-29 | 陕西斯瑞新材料股份有限公司 | Contain Cr2The CuCr contact material preparation method of Nb phase |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1424417A (en) * | 2001-12-10 | 2003-06-18 | 北京有色金属研究总院 | Alloy powders for preparing CuCr alloy probe material and preparation thereof |
| CN1450184A (en) * | 2002-04-10 | 2003-10-22 | 贵研铂业股份有限公司 | Copper base alloy electric vacuum contact material and preparation method thereof |
-
2010
- 2010-07-13 CN CN 201010224766 patent/CN101886185A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1424417A (en) * | 2001-12-10 | 2003-06-18 | 北京有色金属研究总院 | Alloy powders for preparing CuCr alloy probe material and preparation thereof |
| CN1450184A (en) * | 2002-04-10 | 2003-10-22 | 贵研铂业股份有限公司 | Copper base alloy electric vacuum contact material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 《高压电器》 20010825 张程煜等 CuCr25系列合金的耐电压强度 7-8 1-2 第37卷, 第04期 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644042A (en) * | 2012-04-11 | 2012-08-22 | 燕山大学 | Method for increasing electric conductivity of copper-chromium alloy |
| CN104480346A (en) * | 2014-12-25 | 2015-04-01 | 春焱电子科技（苏州）有限公司 | Tantalum contained copper alloy for electronic material |
| CN105755309A (en) * | 2016-03-28 | 2016-07-13 | 西安建筑科技大学 | Technology for preparing copper-chromium contact material by extruding large ingot |
| CN107586977A (en) * | 2017-08-24 | 2018-01-16 | 西安理工大学 | A kind of preparation method of copper alloy with high strength and high conductivity bar |
| CN107586977B (en) * | 2017-08-24 | 2019-04-26 | 西安理工大学 | A kind of preparation method of copper alloy with high strength and high conductivity bar |
| CN110512114A (en) * | 2019-08-31 | 2019-11-29 | 陕西斯瑞新材料股份有限公司 | Contain Cr2The CuCr contact material preparation method of Nb phase |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108103381B (en) | High-strength FeCoNiCrMn high-entropy alloy and preparation method thereof | |
| CN102358920B (en) | Method for preparing CuWCr composite material in consumable electrode arc-melting furnace | |
| CN105018815B (en) | A kind of high-Cr, high withstand voltage copper-chromium contact material and preparation method thereof | |
| CN101886185A (en) | Method for preparing copper-chrome alloy casting blank | |
| CN107841672A (en) | High density ReWTaMoNb containing RexHigh entropy alloy material and preparation method | |
| CN111992726A (en) | Smelting process of vacuum gas atomization CuCrZr powder for additive manufacturing | |
| CN111118379B (en) | Co-bonded TiZrNbMoTa refractory high-entropy alloy and preparation method thereof | |
| CN102901659B (en) | Preparation method for metal alloy test rod | |
| CN108866379A (en) | A kind of high tellurium content copper tellurium contact material and its smelting technology | |
| CN101628328B (en) | New preparation method of AgMgNi alloy conducting ring | |
| CN113430406A (en) | Precipitation strengthening CoCrNiAlNb multi-principal-element alloy and preparation method thereof | |
| CN112126804A (en) | Method for preparing copper-chromium-niobium alloy bar by cooling copper die and direct aging | |
| CN114892064B (en) | FeCrCuVCo high-entropy alloy and preparation method thereof | |
| CN102286673B (en) | Preparation method of CuCr25Me alloy cast blank | |
| CN113913709B (en) | In-situ authigenic hybrid phase reinforced magnesium-based amorphous composite material based on selective phase dissolution and preparation method thereof | |
| CN101787453A (en) | Vacuum circuit-breaking switch contact material preparation method | |
| CN106011575B (en) | A kind of Nb Ti Ta C alloy bars and preparation method thereof | |
| CN108165780A (en) | A kind of preparation method of Ni-Cr-Al-Fe systems high temperature alloy | |
| JPH05117720A (en) | Production of electrode material | |
| CN105063411A (en) | Preparation method for tungsten-copper-cobalt alloy powder | |
| JPH05217473A (en) | Manufacture of electrode material | |
| CN114346190B (en) | Alloy manufacturing equipment and copper-based composite material preparation method | |
| CN102321816A (en) | Method for preparing CuWCr composite material through electric arc melting and infiltration method | |
| CN116005020B (en) | Preparation method of CuTe contact material for high-voltage direct-current contactor | |
| CN115323244B (en) | High-entropy alloy material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20101117 |