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用激光熔覆技术在预涂敷于钛合金(TC4)表面的CaCO3和CaHPO4·2H2O以及Ti粉经两次激光熔覆及适当热处理制备了生物陶瓷涂层。通过X射线衍射(XRD)分析可得:过渡层涂层成分主要为CaTiO3,未热处理的陶瓷层成分主要为磷酸四钙(TTCP),热处理陶瓷层涂层主要物相为羟基磷灰石(HA)。研究工艺参数、热处理以及混合粉末配比对涂层物相组成的影响研究可知:工艺参数激光功率对涂层物相的影响大于扫描速度;800℃热处理4h并随炉冷却可以有效提高涂层HA含量;Ca/P2.00配比的混合粉末所制备的涂层HA含量最高。
Bioceramic coatings were prepared by laser cladding with CaCO3 and CaHPO4.2H2O pre-coated on the surface of titanium alloy (TC4) and Ti powder by two laser cladding and proper heat treatment. The results of X-ray diffraction (XRD) analysis showed that the main coating composition of transitional layer was CaTiO3, the composition of untreated ceramic layer was mainly tetracalcium phosphate (TTCP), and the main phase of heat-treated ceramic coating was hydroxyapatite ). The study of the effects of process parameters, heat treatment and mixed powder ratio on the phase composition of the coating shows that the influence of laser power on the phase of the coating is greater than the scanning speed. Heat treatment at 800 ℃ for 4h and furnace cooling can effectively improve the coating HA Content; Ca / P2.00 ratio of the mixed powder prepared coating HA content highest.