Structural Characterization of Micro-arc Oxidation Formed Titanium Dioxide Films Containing Ca and P
微弧氧化生成含钙磷氧化钛生物薄膜的结构

Titanium dioxide films containing Ca and P on titanium alloy were prepared by micro-arc oxidation. The effect of electrolyte composition and micro-arc voltage on the phase construction, Ca/P atomic ratio, and morphology of the films were explored. The results show that the films are composed of anatase TiO2 and rutile TiO2, which appear dense for inner layer and porous for outer layer in morphology. And Ca/P atomic ratios in the films tend to increase from the film/titanium alloy interface to the surface. The content of amorphous TiO2, size of pores, and Ca/P atomic ratio in the films are increased with increasing micro-arc voltage. Howewer, the films exhibit micro-cracks at higher micro-arc voltage. Increasing Ca/P ratio of the electrolyte can improve the Ca/P atomic ratio in the films.