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Surface Engineering with DLC Coating on Ti6Al4V for Improved Tribological Performance and Longevity of Hip Implant.

Surface Engineering with DLC Coating on Ti6Al4V for Improved Tribological Performance and Longevity of Hip Implant.

Date19th Jan 2022

Time03:00 PM

Venue Through Google Meet: https://meet.google.com/nob-nkfu-dxc

PAST EVENT

Details

Research studies for the current hip implants showed that the friction and wear at the tribo-pair interface are the most significant clinical problems. Besides that, other implant failure involves fretting and tribo-corrosion which increases revision rate. Also, the metal debris and toxic ions release results in the adverse local tissue response (ALTR), pseudotumor formation. Currently, CoCrMo alloy material is widely used as bearing surface for hip implants. However, there are major cytotoxicity problems associated with this CoCrMo material in hip implant. Thus, despite having sound tribo-performance, it is not aptly suitable for long-term implant application, particularly, to improve the longevity of hip implant without revision surgery. In contrast, Ti6Al4V avails excellent biocompatibility, better specific strength, and superior corrosion resistance with inferior tribo-performance. Once the inferior wear performance of Ti6Al4V is conquered, it has the potential to become the best alternative for CoCrMo in orthopedic application. Therefore, this study investigates Ti6Al4V by incorporating laser surface texturing (LST), heat treatment and DLC coating technologies to improve tribological performance and longevity of hip implants. Effects of geometrical parameters of fabricated textures were studied on Ti6Al4V surface and optimized for improved tribological behavior. Textured surface was heat treated to improve hardness, adhesion strength and comprehensive surface characteristics. Synergic effect of LST, heat-treatment and DLC coating improved the bonding behavior of coating interlayer with superior tribological performance of Ti6Al4V. Overall surface engineered Ti6Al4V hip implant shows better lifespan than existing CoCrMo/UHMWPE tribo-pair.

Speakers

Mr. Vivek Kashyap (ME15D207)

Department of Mechanical Engineering