| The metal coated by bioceramic for biomedical application,which can combine the premium properties of both materials. In this work, a series of novel bioceramic was designed and fabricated, which used as coating materials for Ti6Al4V. The compositions of bioceramic were derived from 6PM (originally developed by Gomez) by substituting B2O3 for SiO2 and CaF for CaO. The objective was to adjust the thermal expansion coefficient (α) of the bioceramic and make it compatible with that of Ti6Al4V (10.8×10-6×℃-1). At the same time, bioceramics possess good bioactive properties.The thermal expansion coefficients of bioceramics were calculated by empirical formula, and then the mixture was fired in crucible for 3h at 1350℃in order to melt the bioceramics. The in vitro bioactivity of bioceramics were assessed by determining the changes in surface morphology and composition after soaking in simulated body fluid (SBF) for different periods at 37℃. Thermal expansion coefficient value (α1), softening temperature (TS) were measured by dilatometer. SEM, XRD were employed to investigate the morphology and composition of the bioceramics. XRD, SEM, ICP, FTIR and EDS analyses of the bioceramics surface after different soaking periods in SBF.The result showed that the thermal expansion coefficient can be adjusted by inducing B2O3 (5%-15%). From these bioceramics, the thermal expansion coefficient of 6P64-B5-F4 is 10.1×10-6/℃, which is matched with Ti6Al4V. The thermal expansion coefficient of 6P64-B11-F4 is 8.5×10-6/℃, which is matched with TiN. The coating materials were fluoroapatite-containing bioceramics due to inducing Ca2F (4%).After soaking in SBF for 10 day, a HCA layer to be formed on the bioceramics surface. The bioceramic with fluoroapatite crystals can improve bioactive properties.
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