Effect of doping design on tribological performances of DLC coating in seawater

doi:10.13251/j.issn.0254-6051.2020.03.036

Abstract

Abstract:

Diamond-like carbon coatings with different doping designs (DLC, Cr/DLC and WC/DLC) were prepared on the silicon wafer and 316 stainless steel substrate surface using UDP650 closed-field unbalanced magnetron sputtering system. The structure and mechanical properties of all the coatings were measured by means of SEM, Raman, hardness tester and scratch tester. The tribological performances of these coatings in the air and seawater environments were examined by friction testing machine. The results show that Cr- or WC-doping can significantly promote the graphitization of the DLC coating. Meanwhile, it can improve the adhesion strength and toughness of the DLC coating. In the friction and wear test, due to the lubricating effect of seawater, the friction coefficient and wear rate of all the coatings in the seawater environment is lower than that in the air environment. At the same time, compared with other coatings, the WC/DLC coating exhibits the best tribological properties, mainly depending on its high degree of graphitization, good adhesion and excellent toughness.

Key words: diamond-like carbon (DLC) coating, doping, adhesion force, toughness, tribological performance

CLC Number:

Liu Mengqi, Wang Jianqiang, Wang Yu. Effect of doping design on tribological performances of DLC coating in seawater[J]. HTM, 2020, 45(3): 186-190.

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