10.22376/ijpbs.2019.10.1.p1-12 Volume 8 Issue 1 2017 (January - March) This paper reports on the mechanical, microstructure, phase analysis and antibacterial activity of two different wear-resistant and osseointegration coatings performed on Ti-6Al-4V alloys for orthopedic applications. The powders of following compositions were sprayed using atmospheric plasma spray process onto Ti-6Al-4V alloy a) alumina-titania, [AT] b) yttrium stabilized zirconia [YSZ], c) bilayered AT/YSZ, d) bilayered YSZ/AT, e) Hydroxyapatite [HaP], f) TiO lessThan sub greaterThan 2 lessThan /sub greaterThan g) HaP [30%] + TiO lessThan sub greaterThan 2 lessThan /sub greaterThan [70%], h) HaP [70%] + TiO lessThan sub greaterThan 2 lessThan /sub greaterThan [30%] and i) HaP [50%] + TiO lessThan sub greaterThan 2 lessThan /sub greaterThan [50%]. The coatings were characterized using X-ray diffraction (XRD), Scanning electron microscope (SEM) and surface roughness measurement. In addition, microindentation hardness measurements and scratch strength measurements were also performed. Amongst the various coatings AT, BL AT/YSZ and 3H7T exhibited higher hardness values and BL YSZ/AT and 3H7T offered higher scratch resistance. Antibacterial testing was also performed on all the coatings. The wettability studies reveal the soft coating to be hydrophilic and hard coating as hydrophobic. Comparatively, there were less lessThan i greaterThan S. aureus lessThan /i greaterThan on plasma sprayed soft coatings deposited on Tialloys compared with hard coatings after 18 hours of culture respectively. From the results, 3H7T, AT and BL AT/YSZ have less number of bacterial colonies adhered to its surface. SUGANTHAN VEERACHAMY AND GEETHA MANIVASAGAM Hard coatings, soft coatings, plasma spraying, wettability, antibacterial studies. 358-369