Surface modification of Co–Cr–Mo implant alloy by laser interference lithography. (May 2016)

• Record Type: Journal Article
• Authors: Wei, Xiaofeng; Li, Wenjun; Liang, Bojian; Li, Binglin; Zhang, Jinjin; Zhang, Linshuai; Wang, Zuobin
• Is Part Of: Tribology international. Volume 97(2016)
• Page Start: 212
• Page End: 217
• Publication Date: 2016-05
• Subjects: Co–Cr–Mo implant alloy -- Laser interference lithography -- Friction -- Hardness; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2016.01.039
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: This article studies the feasibility of using laser interference lithography (LIL) for surface modification of Co–Cr–Mo implant alloy which has been universally applied to joint materials in total joint replacements. The tribological performances and surface topography of the samples were studied by RTEC micro-friction and wear tester and scanning electron microscope (SEM). Hardness testing of the modified sample surfaces was carried out using the micro-hardness tester (MH-60). Experimental results indicate that the sample surface modified with laser interference lithography presents better tribological performances and hardness properties than those untreated materials, including a 64% friction coefficient reduction and 40% hardness enhancement, which is very promising to significantly reduce the mean revision rate of post primary total hip replacements in the future. Highlights: Co–Cr–Mo implant alloy is directly modified by laser interference lithography. A three-beam laser interference system is set up to generate periodic structures. Highly patterned micro structures are fabricated on the Co–Cr–Mo alloy surface. The alloy surface friction and hardness properties are significantly improved. This method is helpful for reducing the revision rate of total joint replacements.