Abstract
Generally, hydroxyapatite coating on Ti-6Al-4V orthopeadic implant is performed by the high temperature process such as for example plasma spraying or flame spraying. The chemical state of the vanadium at the boundary of Ti-6Al-4V substrate and hydroxyapatite coating layer sprayed by flame spraying was investigated. The adhesive strength between coating and substrate were measured, and the interface was investigated by scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDX). X-ray diffraction (XRD) and X-ray absorption near edge structure (XANES) spectrum show that the diffusion of vanadium element and titanium element was not detected at the interface between hydroxyapatite and Ti-6Al-4V substrate, and the existence of the new reaction phase was not also detected. It is suggested that vanadium exists in Ti-6Al-4V alloy.
