钙、磷在钛表面微弧氧化层中的存在形式及进入机制

STATUS AND ENTRANCE MECHANISM OF CALCIUM AND PHOSPHATE IN MICROARC OXIDATION LAYER ON TITANIUM

钛经微弧氧化,得到一层富含钙、磷的多孔二氧化钛陶瓷层。用SEM,XRD,IR,XPS等观察陶瓷层的组织结构和元素、官能团,并对钙、磷进入机制进行探讨。结果表明:陶瓷层主要由锐钛矿型和金红石型二氧化钛组成,且金红石型二氧化钛含量随电压和Ca2+浓度的升高而增大,高电压下还出现钛酸钙相。陶瓷膜中钙主要以钛酸钙盐的形式存在,磷则主要以PO43-形式存在,两者在膜中分布较为均匀。扩散和电泳是钙、磷进入机制。

A porous TiO2 ceramic layer containing calcium and phosphate was prepared by microarc oxidation on titanium. The microstructure, compositions and elements of the ceramic layer were analyzed by SEM, XRD, IR and XPS. The results show that anatase and rutile are the main composition of the layer. With the increasing of applied voltage and Ca2+ concentration of electrolyte, the content of rutile increases. Under high voltage calcium comes into the layer and forms CaTiO3, while phosphate comes into the layer and exists as PO43-. They are homogeneously distributed on the ceramic layer. Diffusion and electrophoresis are the entrance mechanism for calcium and phosphate.