A high-strength, high-conductivity, heat-resistant copper-chromium alloy material and its preparation process

Abstract

The embodiment of the invention provides a high-strength and high-conductivity heat-resistant copper-chromium alloy material and a preparation process thereof. The alloy material is reasonable in formula of components; the electric conductivity of the obtained copper-chromium alloy material can reach 82-98% IACS, the yield strength is 400-540 MPa, the strength of extension is 450-550 MPa, the ductility is 5-20%, and the material can resist heat greater than 550 DEG C; the problems of copper-chromium alloy materials in the prior art are solved; and raw materials of components are easy to obtain, no noble metal is included, and the cost is relatively low. The preparation process has no harsh preparation condition, is low in requirement for equipment, and is easy to industrially popularize.

Description

technical field [0001] The invention belongs to the technical field of copper alloys, and in particular relates to a high-strength, high-conductivity, heat-resistant copper-chromium alloy material and a preparation process thereof. Background technique [0002] With the continuous upgrading of electrical and electronic industry technology and high-speed railway train technology, especially the key technical requirements of terminal connectors with high current, substrate and high-speed railway train speed up to 350km / h or more, copper alloys are required to have better Comprehensive performance, including higher yield strength (above 500MPa), higher electrical conductivity (above 80%IASC), and better heat resistance (above 500°C), etc. [0003] In the process of realizing the embodiments of the present application, the inventors of the present application found that although the copper-chromium alloy is an ideal high-strength and high-conductivity copper alloy, its heat resi...

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Problems solved by technology

[0003] In the process of realizing the embodiment of the present application, the inventors of the present application found that although the copper-chromium alloy is an ideal high-strength and high-conductivity copper alloy, its heat resistance is relatively poor (about 400°C).

Although the addition of Zr, Ag, Mg and other alloying elements improves the comprehensiveness and performance of copper-chromium alloys to a certain extent, however, Zr is easily oxidized and will react with common furnace lining materials.

Atmospheric smelting can also easily lead to unstable composition, and the structure and performance of the finished product after subsequent processing are low.

However, vacuum melting will significantly increase the cost, and the grain structure will be coarse, and the bending resistance will decrease.

Although Ag can slightly improve the heat resistance of the alloy, Ag is expensive, which will lead to a sharp increase in cost

Although the addition of Mg can also improve the heat resistance to a certain extent, it will significantly deteriorate the electrical conductivity.

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