Abstract
In the present research work, experimental investigation and parametric optimization plasma spray deposition process have been carried out to deposit a nature-inspired biomimetic coating of hydroxyapatite (HA)-and titania (TiO2) on low elastic β-phase Ti-35Nb-7Ta-5Zr alloy for orthopedic application. The effect of powder mixture ratio, gas flow rate, and powder feed rate on the surface hardness and adhesion strength was investigated. The experiments were conducted as per the L-9 orthogonal array. The morphology, coating thickness, elemental composition, and phase composition of the developed coatings were characterized and analyzed using field emission-scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) technique. It has been found from the morphological investigation that the coated surface contained splats like morphology, globules, and craters. The best optimal condition to obtain the maximum surface hardness is the high level of powder ration (50%HA-50%TiO2), high level of gas flow rate, and low level of powder federate. The best optimal condition to obtain the maximum adhesion strength is the medium level of powder ration (70%HA-30%TiO2), low level of gas flow rate, and a high level of powder federate.
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