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Method for preparing copper-chromium composite contact material through electron beam cladding process

An electron beam cladding and composite contact technology, which is applied to metal material coating process, coating and other directions, can solve the problems of tissue inclusions, high gas content, low material purity, etc., to avoid inclusions, uniform and fine particle size. , to ensure the effect of bonding strength

Inactive Publication Date: 2017-05-17
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is that the existing process for preparing copper-chromium composite contact materials has coarse and uneven structures, structure inclusions, low material purity, high gas content, and it is impossible to prepare "copper-chromium-copper" composite contacts. To solve the problem of poor electrical conductivity and provide a method for preparing copper-chromium composite contact material by electron beam cladding process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing a copper-chromium composite contact material by an electron beam cladding process, the method comprising the following steps:

[0021] 1) Base material preparation: the oxygen-free copper block is made into the desired shape by mechanical processing equipment, and the purity of the oxygen-free copper block is ≥99.95%;

[0022] 2) Preparation of covering powder: Copper powder and chromium powder are mixed according to the ratio of Cu powder by weight: Cr powder=9:1 to obtain copper-chromium alloy mixed powder, the purity of Cr powder is ≥99.0%, the purity of Cu powder is ≥99.7%, and the purity of Cr powder is ≥99.7%. The particle size of the powder is 100 microns, the particle size of the Cu powder is 380 microns, then add absolute ethanol, by weight, copper chromium alloy mixed powder: copper balls: absolute alcohol = 100:100:1, carry out ball milling with copper balls Powder for 3 hours, the prepared product has a uniform and fine structure to ob...

Embodiment 2

[0028] A method for preparing a copper-chromium composite contact material by an electron beam cladding process, the method comprising the following steps:

[0029] 1) Base material preparation: the oxygen-free copper block is made into the desired shape by mechanical processing equipment, and the purity of the oxygen-free copper block is ≥99.95%;

[0030] 2) Preparation of covering powder: Copper powder and chromium powder are mixed according to the ratio of Cu powder by weight: Cr powder=7:3 to obtain copper-chromium alloy mixed powder, the purity of Cr powder is ≥99.0%, the purity of Cu powder is ≥99.7%, and the The particle size of the powder is 250 microns, the particle size of the Cu powder is 300 microns, then add absolute ethanol, by weight, copper chromium alloy mixed powder: copper ball: absolute alcohol = 100:100:1, carry out ball mill mixing with copper ball Powder for 7 hours, the prepared product has a uniform and fine structure to obtain a coating powder;

[00...

Embodiment 3

[0036] A method for preparing a copper-chromium composite contact material by an electron beam cladding process, the method comprising the following steps:

[0037] 1) Base material preparation: the oxygen-free copper block is made into the desired shape by mechanical processing equipment, and the purity of the oxygen-free copper block is ≥99.95%;

[0038] 2) Preparation of covering powder: Copper powder and chromium powder are mixed according to the ratio of Cu powder by weight: Cr powder=5:5 to obtain copper-chromium alloy mixed powder, the purity of Cr powder is ≥99.0%, the purity of Cu powder is ≥99.7%, and the The powder particle size is 400 microns, the Cu powder particle size is 100 microns, then add absolute ethanol, by weight, copper chromium alloy mixed powder: copper ball: absolute alcohol = 100:100:1, carry out ball milling with copper ball Powder for 10 hours, the prepared product has a uniform and fine structure to obtain a coating powder;

[0039] 3) Covering: ...

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Abstract

The invention discloses a method for preparing a copper-chromium composite contact material through an electron beam cladding process. The method comprises the following steps: (1) preparation of a base body material; (2) preparation of cladding powder: mixing copper powder and chromium powder according to a ratio, then adding absolute ethyl alcohol, and carrying out ball grinding on the mixed powder through a copper ball to obtain the cladding powder; (3) spreading: spreading the cladding powder on the surface of an oxygen-free copper block; (4) pressing: pressing the cladding layer with a press, and carrying out natural airing or drying; (5) vacuumizing: putting a pressed sample into electronic beam equipment, and vacuumizing to 10<-2> pa or below; (6) electron beam scanning: melting the cladded copper-chromium powder through electron beam scanning, and enabling the surface of an oxygen-free copper base body to be slightly melted to form metallurgical bonding between the copper-chromium powder and the oxygen-free copper base body. According to the preparation method disclosed by the invention, the raw materials are not in contact with a crucible, so that inclusions caused by falling of the crucible and relatively high product gas content caused by crucible degassing are avoided; and meanwhile, by rapid cooling, the particle size of a product from the edge part to the heart part is uniform and fine.

Description

technical field [0001] The invention relates to the technical field of manufacturing copper-chromium composite contact materials, in particular to a method for preparing copper-chromium composite contact materials by an electron beam cladding process. Background technique [0002] In the prior art, the method for preparing copper-chromium composite contact materials mainly adopts the vacuum induction melting process, but the vacuum induction melting process has the following disadvantages: 1) when the vacuum induction melting process prepares the electrical contact material, the crucible will fall off and cause inclusions; 2) Vacuum induction melting process preparation from the edge to the center of the contact piece, the chromium particles in the metallographic structure gradually increase, and the uniformity of the structure is inconsistent; 3) The crucible is deflated during the vacuum induction melting process preparation process, resulting in high gas content; 4) The v...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 张石松王小军师晓云赵俊刘凯李鹏王文斌李刚
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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