| Citation: | PANG Aihong, SUN Guiqian, DONG Junyan, PANG Chengyu, GUO Yu, DONG Shushan. Microstructure and properties of laser cladding diamond-metal wear-resistant coating[J]. Diamond & Abrasives Engineering, 2023, 43(4): 514-522. doi: 10.13394/j.cnki.jgszz.2023.0127
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The surface of 10 to 30 μm fine-grained diamond was plated with Cr, and the Cr- plated diamond was mixed with Ni-Cr-B-Si powder and placed on the surface of carbon steel. The wear-resistant coating was prepared by using a laser heat source to melt the preset powder on the surface of carbon steel. The results show that the thickened Cr coating on the diamond surface can effectively protect the diamond in the laser high-temperature thermal field, avoids oxidation and graphitization of the diamond at high temperatures, and achieves metallurgical bonding between the diamond and the metal matrix. The metallography, phase and morphology of the coating are analyzed, and it is found that the diamond can significantly improve the cooling rate of the coating, refine the condensing structure, increase the hardness, and enhance the wear resistance of the coating. The wear resistance of the cladding coating with a mass fraction of 20% Cr-plated diamond is 4.6 times higher than that of without diamond, and the corresponding friction coefficient is nearly 50% lower.
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