中文摘要：

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。

英文摘要：

Bioceramic coatings on titanium alloy（TC4）is fabricated with the powders of CaCO3,CaHPO4·2H2O and Ti by laser cladding and heat treatment.Phase analysis by X-ray diffraction（XRD）indicates that the main compose of transitional coating is CaTiO3,and the ceramic coating without heat treatment is tetracalcium phosphate（TTCP）,the ceramic coating after heat treatment is hydroxyapatite（HA）.It can be conclude that laser power has a greater impact on the composition of coating than scanning speed.The heat treatment process at temperature 800 ℃ for4 hours and furnace cooling can promote the regeneration of HA and effectively increase the content of HA in ceramic layer.The HA content of coating fabricated with Ca/P2.00 powders is higher than those of others.