Study on the Preparation and Characteristics of Copper-Chromium Alloy Cladding Layer
In order to protect the power equipment and improve the surface strength of the material, this study explores the feasibility of preparing a protective layer on the copper substrate using laser cladding technology. The phase, microstructure and element distribution of the cladding layer were analyzed, and the changes in the microhardness of the cross-section and electrical conductivity were measured. The wear resistance of the two cladding layers was tested and compared with the wear resistance of pure copper. The experimental results show that the cladding layer has uniform structure distribution, fine grains, and no element segregation. The hardness of the cladding layer is greatly increased, and the average hardness of the CuCr(20) cladding layer is 155.8 HV, which can reach 2.2 times that of the matrix. The average hardness of CuCr(40) cladding layer is 254.4 HV, which can reach 3.6 times that of the matrix.The conductivity of the cladding layer is lower than that of pure copper, but the wear resistance is significantly improved. The wear resistance of the CuCr(40) cladding layer is higher than that of the CuCr(20) cladding laye and reach 3 times that of pure copper. Experiments proved that the protective effect can be achieved by preparing a laser cladding layer on the surface of pure copper.
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