Improved wear resistance of functional diamond like carbon coated Ti-6Al-4V alloys in an edge loading conditions

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• 作者：Dipankar Choudhury^a ; ^b ; ^{Dipankar.choudhury78@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Jü ; rgen M. Lackner^c ; Lukasz Major^d ; Takehiro Morita^e ; Yoshinori Sawae^f ; ^g ; Azuddin Bin Mamat^g ; Ian Stavness^a ; Chanchal K. Roy^a ; Ivan Krupka^b ; ^h
• 关键词：Functional diamond-like carbon ; Silicon nitride ; Wear resistance ; Edge loading ; Orthopedics implant
• 刊名：Journal of the Mechanical Behavior of Biomedical Materials
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：59
• 期：Complete
• 页码：586-595
• 全文大小：3870 K

文摘

This study investigates the durability of functional diamond-like carbon (DLC) coated titanium alloy (Ti–6Al–4V) under edge loading conditions for application in artificial hip joints. The multilayered (ML) functional DLC coatings consist of three key layers, each of these layers were designed for specific functions such as increasing fracture strength, adapting stress generation and enhancing wear resistance. A ‘ball-on-disk’ multi-directional wear tester was used in the durability test. Prior to the wear testing, surface hardness, modulus elasticity and Raman intensity were measured. The results revealed a significant wear reduction to the DLC coated Ti–6Al–4V disks compared to that of non-coated Ti–6Al–4V disks. Remarkably, the counterpart Silicon Nitride (Si₃N₄) balls also yielded lowered specific wear rate while rubbed against the coated disks. Hence, the pairing of a functional multilayered DLC and Si₃N₄ could be a potential candidate to orthopedics implants, which would perform a longer life-cycle against wear caused by edge loading.