The Effect of Bias on Properties of DLC Coatings for Artificial Joints

Ren Ying1,*, Wang Renjie1, Cheng Qiaohuan1, Chen Qianqian1, Xu Zhigao2

1School of Material Science and Engineering, Henan University of Technology, Lianhua Street 100, Zhengzhou, 450001, China

2The Third People's Hospital of Datong, Wenchang Street 1, Datong, 037100, China

Adv. Mater. Lett., 2020, 11 (10), 20101568

DOI: 10.5185/amlett.2020.101568

Publication Date (Web): Aug 21, 2020

E-mail: ying_ren@haut.edu.cn

Abstract


Diamond-like carbon (DLC) coatings, due to excellent tribological and biological properties, were used wildly to improve the wear resistance and corrosion resistance of the metal-based artificial joints. In this work, DLC coatings were deposited by a vacuum arc using the anode-cathode diameter ratio of da/dc=3/1 with the negative bias applied to the P2000 steel substrate. The relation between the substrate bias and properties of DLC coatings was investigated. The study showed that DLC coating had lower ratio of sp2/sp3 and lower friction coefficient at higher bias of – 750 V. With increasing bias, the wear particle size of DCL coatings tended to move towards the distribution of smaller particles. Comparing with the uncoated P2000, P2000 coated with DLC deposited at – 750 V had better biocompatibility. It was revealed that DLC coating deposited by a vacuum arc technique in conjunction with high substrate DC biasing can improve the tribological property and biocompatibility of P2000.

Keywords

Diamond-like carbon coatings, bias, wear particle size distribution, biocompatibility.

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