Microstructure and properties of CrAlSiN coating deposited on TC4 titanium alloy

doi:10.13251/j.issn.0254-6051.2022.06.038

Abstract

Abstract: In order to improve surface hardness and wear resistance of TC4 titanium alloy, the surface modification on the alloy was carried out by a combination of plasma nitriding and multi-arc ion plating technology. Microstructure, hardness, wear resistance and corrosion resistance of the TC4 titanium alloy, nitrided layer and CrAlSiN coating were studied by means of scanning electron microscopy, Vickers microhardness tester, three-position profiler, high-speed reciprocating friction and wear tester and electrochemical workstation. The results show that after nitriding treatment, surface hardness of the TC4 alloy is increased by about 2 times. The average hardness of the CrAlSiN coating prepared on this basis is as high as 3222 HV0.025, and there are a few large particles and pits on the coating surface. The average friction coefficient of the CrAlSiN coating is 0.22, and the wear mechanism is mainly adhesive wear. The material of the grinding pair adheres to the surface of the coating, and the coating is almost wear-free, and the wear resistance is significantly improved. The self-corrosion potential of the CrAlSiN coating is -0.542 V, which is 0.205 V higher than that of the TC4 titanium alloy substrate (-0.747 V), indicating that the electrochemical corrosion resistance of the CrAlSiN coating deposited on the basis of nitrided layer is significantly improved.

Key words: TC4 titanium alloy, multi-arc ion plating, plasma nitriding, CrAlSiN coating, wear resistance

CLC Number:

TG174.444

Wu Yiruo, Xie Feng, Zhang Yuexia, Zhang Yujun, Liu Manhong, Hu Hanjie, Chen Quanlong, Zhou Zhiming. Microstructure and properties of CrAlSiN coating deposited on TC4 titanium alloy[J]. Heat Treatment of Metals, 2022, 47(6): 202-207.

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