Abstract
The present work focuses on the improvement in wettability and bio-tribological performance of Ti-6Al-4V titanium alloy using mechanically micro-textured surfaces. Three types of mechanical micro-tools, namely, micro flat-end mill, micro ball-end mill and micro-drill having equal diameter of 200 μm each, are used to fabricate circular micro-dimples with flat, semi-hemispherical and conical end geometries, respectively, on Ti-6Al-4V surface. The effects of micro-textured geometries on surface roughness, microhardness, surface wettability and coefficient of friction (COF) are estimated. Surface wettability is measured in terms of pure water contact angle, whereas, COF is estimated under in vitro condition of a hip joint prosthesis. Among different micro-dimpled surfaces, semi-hemispherical end micro-dimpled surface is found to be more suitable for hip joint prosthesis due to its extremely good surface wettability and lower COF. Results of this study also indicate that the mechanical micromachining processes are efficient methods for the fabrication of functional surfaces on titanium alloys and similar biomaterials.
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