Abstract
Hydroxyapatite (HA) coatings were deposited onto TiAl6V4 substrate by microplasma spraying (MPS). Hanks balanced salt solution (HBSS) immersion test was used to evaluate the coating bioactivity. Scanning electron microscopy (SEM), energy-dispersive analysis (EDS), and X-ray diffraction (XRD) analysis were used to investigate the microstructure, surface morphology, and phase composition of the HA coatings. Inductively coupled plasma (ICP) analysis was used to determine the calcium ion concentrations of HBSS via immersion time. The results demonstrated that the double-layer coating designed in this study, which consisted of a thinner discontinuous top layer with a lower crystallinity and a thicker bottom layer with a high crystallinity, could provide a rapid formation of the bone-like apatite layer on the HA coating in the early stage of immersion, on the one hand, and had a potential to improve the long-term stability of the HA coating due to its high crystallinity bottom layer, on the other hand.
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