Preparation method of high-fusion-welding-resistance copper-chromium fine-grain composite contact

A composite contact, fusion welding technology, applied in the direction of improving energy efficiency, high-voltage air circuit breaker, process efficiency, etc. and other problems, to achieve the effect of improving electrical and thermal conductivity, improving electrical conductivity and hardness, and eliminating mechanical processing.
CN112091216AActive Publication Date: 2020-12-18SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
Publication Date
2020-12-18

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Abstract

The invention relates to a preparation method of a high-fusion-welding-resistance copper-chromium fine-grain composite contact, and belongs to the technical field of copper-chromium contact manufacturing. The preparation method comprises the steps of powder mixing, 3D printing, heat treatment, wire cutting and surface treatment, wherein a composite layer is CuCr (0.5-2%) alloy powder, a contact layer is CuCr (10-50%) Te (0.2-1%) composite powder. The as-cast composite contact is prepared on the basis of a 3D printing process, and therefore, the interface between the contact layer and the composite layer can be flush, and the density is greatly improved. A Cr phase dissolved in Cu in a solid mode is separated out through shock cooling and heat treatment, the Cr phase is extremely fine, meanwhile, a CuTe phase is separated out, a CuTe brittle phase is formed, and the problem that the fusion welding resistance of an as-cast structure is poor is solved.
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Description

technical field

[0001] The invention relates to the technical field of manufacturing copper-chromium contacts, in particular to a method for preparing a high-resistant fusion welding copper-chromium fine-grain composite contact. Background technique

[0002] Copper-chromium alloy contact material is currently recognized as the best material for vacuum circuit breakers due to its excellent comprehensive performance, and CuCr / Cu series composite contacts have higher electrical conductivity and thermal conductivity than conventional CuCr contacts , and only about 1.5 mm of CuCr layer can meet the requirements, which greatly reduces the thickness, and at the same time, the common AgCu solder can meet the requirements in the welding process with the conductive rod, instead of expensive PdAgCu solder, so the cost can be reduced .

[0003] However, at present, CuCr / Cu series composite contacts are mostly prepared by powder metallurgy method. Compared with contacts prepared by conv...

Claims

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