纯钛表面微弧氧化膜的粗糙度与接触角

Roughness and contact angles of micro-arc oxidation coating on the surface of titanium

目的:分析纯钛表面微弧氧化改性对表面氧化膜特性的影响。方法:通过微弧氧化技术在含一定钙磷比例的电解液中制备纯钛表面氧化膜层,进而检测纯钛表面微弧氧化膜的粗糙度和接触角。结果:微弧氧化处理后,纯钛表面生成微孔结构的氧化膜,直径1～5μm。氧化膜层中含Ti、O、Ca、P4种元素,由锐钛矿型、金红石型二氧化钛,结晶相羟基磷灰石组成;微弧氧化试样的表面粗糙度明显高于未处理纯钛试样(P<0.05),表面接触角小于未处理纯钛试样(P<0.05)。结论:经微弧氧化技术处理后,纯钛表面生成了多孔的二氧化钛膜,含羟基磷灰石。膜层表面粗糙度增大,接触角减小,有利于细胞的附着和骨组织的整合。

OBJECTIVE： To analyze the influence of surface modification of pure titanium by micro-arc oxidation on surface oxidation coating features. METHODS： The oxidation coating was prepared on titanium surface by using micro-arc oxidation in electrolyte containing calcium and phosphonium at certain ratio, and the roughness and contact angles of the new oxidation coating were detected. RESULTS： Ceramic microporous coating was formed on titanium surface with micro-arc oxidation, 1-5 μm in diameter. On the surface, the coating was made from O, Ti, Ca, and P elements. The phase components of the coating included anatase, rutile and hydroxyapatite. The surface roughness of micro-arc oxidation specimens was significantly increased （P 〈 0.05）, and contact angles were significantly decreased following micro-arc oxidation （P 〈 0.05）. CONCLUSION： The oxidation coating with micropores, hydroxy-apatite, increased roughness and decreased contact angles on titanium surface formed following micro-arc oxidation, which benefits cell adherence and bone tissue integration.