激光熔覆原位合成制备生物陶瓷涂层  

The in-situ fabricating of the bioceramic coating by laser cladding

作　　者：王迎春[1] 李飞群[1] 李延民[1] 丁健君[1] 李建国[1] 周尧和[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200030

出　　处：《激光技术》2004年第6期572-574,共3页Laser Technology

摘　　要：激光熔覆直接处理CaHPO4·2H2 O与CaCO3 的复合粉末 ,制备出了羟基磷灰石 (HAP)生物陶瓷涂层。结果表明 ,熔覆层组织为粒状的HAP分布于互相搭接的棒状 β Ca2 P2 O7之中 ,熔覆层主要物相为 β Ca2 P2 O7与Ca5(PO4) 3 (OH)。涂层与基体结合处为平界面外延生长的带状组织 ,熔覆层中部则为典型的胞状晶 ,熔覆层表面组织为粒状等轴晶 ,组织演化决定于激光熔覆时的温度梯度 /凝固速度 (G/R)的比值。The bioceramic coating is fabricaed by laser claddin g directly processing the mixed power of CaHPO 4·2H 2O and CaCO 3.It is shown that the microstructure of the coating is the granular HAP distributed in the ov erlapped club-shaped β-Ca 2P 2O 7 and the main phases in the coating are β-Ca 2P 2O 7 and Ca 5(PO 4) 3OH;there is the bonded structure of the ext ension growth on plane basis between the substrate and the cladding layer,typic al cellular crystals in the middle of the molten layer and equiaxed crystals at the top of the cladding layer.The microstructure evolution is determined by the ratio of temperature gradient and solidification velocity(G/R) produced by laser cladding.

关 键 词：激光熔覆 生物陶瓷涂层 物相 凝固组织 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]