Hydrophobic rare earth doped copper-silver alloy-carbon nano composite coating material for electrical contact and preparation method thereof

Abstract

The invention relates to a hydrophobic rare earth doped copper-silver alloy-carbon nano composite coating material for an electrical contact and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing required copper-silver alloy powder, carbon powder (graphite and graphene) and rare earth powder raw materials, then adopting copper with certain roughness as a matrix, and utilizing high-speed mixed powder produced by a cold spraying technology to impact the matrix to deposit the rare earth doped copper-silver alloy-carbon nano composite coating material; and after preparation of an initial cold spraying coating is finished, utilizing a laser to carry out rapid scanning on the surface of the coating according to different parameters, so that the rare earth doped copper-silver alloy-carbon nano composite coating material for the electrical contact is obtained. The prepared rare earth doped copper-silver alloy-carbon nano composite coating material for the electrical contact has excellent hydrophobic property, wear resistance, electrochemical corrosion resistance and arc erosion resistance, and adaptability and usability of a silver-based electrical contact material in an outdoor humid environment can be effectively improved.

Description

technical field [0001] The invention relates to a hydrophobic rare earth-doped copper-silver alloy-carbon nanocomposite coating material for electric contacts and a preparation method thereof, belonging to the field of coating materials. Background technique [0002] The electrical contact material is an essential component of the contact element in the current-carrying conversion device. It has been developed for more than 100 years. It is applied to various light and heavy load high and low voltage electrical appliances, household appliances, automotive electrical appliances and aerospace electrical appliances. Among them, electrical contact composite materials have attracted much attention because of their good performance fusion. Silver-based electrical contact materials, as the most widely researched and applied electrical contact materials, have good wear resistance, welding resistance, and electrical conductivity. And the characteristics of small contact resistance, ...

AI Technical Summary

Problems solved by technology

Due to the small specific gravity of carbon powder, it is not easy to produce uniformly by powder metallurgy; the production of silver-carbon composite materials by sintering extrusion method can reach more than 99.9% of the theoretical density, and various properties are significantly improved; there are also pressing and sintering methods. Preparation of nickel-added Ag / C contacts, however, these processes require a large amount of metallic silver, which consumes a lot of cost

[0004] The comprehensive performance of electrical contact materials (such as welding resistance, arc burning resistance, temperature rise, corrosion rate) is affected by the composition, structure, microstructure and preparation process of the material, but the current preparation of silver-based graphite electrical contact materials The method still has the problems of complex steps, long time consumption, poor dispersion, serious pollution, high consumption, and poor corrosion resistance and arc erosion resistance of materials.

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