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Microstructure and Mechanical Properties of Amorphous Hydrogenated DLC-Coated Ti-6Al-4V ELI Alloy with TiCN Interlayer Prepared by rf-PECVD

Lee Kwangmin, Kang Seokil

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 4

1357--1360

The low adherence of diamond-like carbon (DLC) films on titanium (Ti) alloys can be improved by using interlayer coatings. In this study, DLC (a-C:H) films were deposited using radio-frequency plasma-enhanced chemical vapor deposition (rf-PECVD), and a TiCN interlayer was applied between the extra low interstitial (ELI) grade of Ti-6Al-4V alloy and a-C:H film. The characteristics of the a-C:H-coated Ti-6Al-4V ELI alloy were investigated using field emission scanning electron microscopy, Vickers hardness, and scratch and wear tests. The DLC (a-C:H) films deposited by rf-PECVD had a thickness of 1.7 μm, and the TiCN interlayer hada thickness of 1.1 μm. Vickers hardness of the DLC (a-C:H) films were increased as a result of the influence of the TiCN interlayer. The resulting friction coefficient of the a-C:H-coated Ti-6Al-4V with the TiCN interlayer had an extremely low value of 0.07.