In Vitro Study of Microplasma Sprayed Hydroxyapatite Coatings in Simulated Body Fluid
Hydroxyapatite (HA) coatings were deposited onto Ti6Al4V substrate by microplasma spraying (MPS) in the current research. The morphology, phase compositions, and percentage of crystallinity of the coatings were characterized by means of scanning electron microscopy (SEM) and X-ray diffraction. An in vitro evaluation by soaking the coatings in simulated body fluid (SBF) for up to 14 days was conducted aiming at the evaluation of their bioactivity. Results from the present investigation suggest that microplasma sprayed HA coatings exhibited certain roughness, pores, and microcracks. Thermal decomposition existed in the coatings where HA, α-TCP，β-TCP, amorphous phases, and CaO-exclusive impurities were observed. The in vitro test indicated that HA coatings deposited by MPS possessed better bioactivity and stability. A layer of carbonate-apatite covered most of the coating surface, which did not exhibit significant spalling after incubation in SBF.
Yansheng Yin and Xin Wang
Q. Y. Zhao et al., "In Vitro Study of Microplasma Sprayed Hydroxyapatite Coatings in Simulated Body Fluid", Advanced Materials Research, Vols. 79-82, pp. 815-818, 2009