Microstructure and properties of cold sprayed copper-diamond composite coatings
LIU Shuyu1, PENG Yingbo1,2, GAO Peiran1, TAN Yanni1, ZHANG Wei1
1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. College of Engineering, Nanjing Agricultural University, Nanjing 210031, China
Abstract Titanium alloys are widely used in aerospace due to their high specific strength, but the sliding friction performance is poor, which seriously affects the life of related components. Surface modification is a common method to improve the friction behavior of titanium alloy, and the metal-based diamond composite coating is one of the important research directions. In this paper, dense copper-based diamond composite coating was prepared on the surface of TC18 alloy by spray drying powder combined with cold spraying. The principle of cold spray deposition of composite powders and the correlation between microstructure and mechanical properties of coatings before and after heat treatment were explored. The results show that the composite powders prepared by spray drying meet the requirements of cold spraying process. After cold spraying, the diamond is dispersed in the coating with a mass fraction of 0.74%, and no damage or graphitization occurs. Cold sprayed diamond/copper coating shave considerable electrical conductivity and high hardness. The wear mechanism of the coatings is shear fracture and peeling. Afterheat treatment at 600 ℃, the hardness of the composite coating reduces to 95.8 HV and the conductivity increases to 89.3%IACS. The friction behavior of the coating is improved as well. The wear rate of the coating was reduced by 41%.
LIU Shuyu,PENG Yingbo,GAO Peiran, et al. Microstructure and properties of cold sprayed copper-diamond composite coatings[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(6): 638-647.
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2022, Vol. 27 
