钛表面微弧氧化TiO_2/HA复合层的制备

Preparation of TiO_2/HA composite coating by micro-arc oxidation on titanium surface

为提高钛植入体材料的生物相容性,对钛表面进行微弧氧化处理,在钛表面生成了不同形貌的羟基磷灰石(HA).在氧化时间、频率和占空比一定,电解液中钙磷比为2时,通过对不同电压微弧氧化后钛表面的氧化层进行SEM、EDS、XRD、粗糙度和接触角检测,分析电压对氧化层的形貌、元素、物相组成、表面粗糙度和润湿性的影响;对不同电压、电流、电解液浓度微弧氧化的氧化层进行SEM观察,探究电压、电流和电解液浓度对HA的形成的影响;并探讨了HA的形成速率变化.结果表明:电压、电流和电解液浓度任意两个变量固定,另一变量增加到一定值均可在钛表面生成HA,且三者任一变量增加均可提高HA在氧化层表面的形成速率;电压增加可使表面粗糙度增加,并有效减小材料表面的接触角,提高材料的润湿性.

A bstract In order to improve the biocompatibility of titanium implant materials, hydroxyapatite（HA） with different morphologies was formed on the surface of titanium by micro-arc oxidation. During the research work, the oxidation time,frequency and duty cycle were constant and the ratio of calcium to phosphorus in the electrolyte is 2.The effect of voltage on surface morphology, element, phase composition, surface roughness and wettability of the oxide layer were analyzed by detection of SEM, EDS, XRD, roughness and contact angle of the oxide layer on the surface of titanium after different arc oxidation. We observed SEM with different voltage, current, electrolyte concentration and micro arc oxidation and investigated The effects of voltage, current and electrolyte concentration on the formation of HA. The formation rate change of HA was also discussed. The results show that HA can be formed on the titanium surface when any two variables, such as voltage, current and electrolyte concentration are fixed and the other variable is increased to a certain value. And the increase of eitherof the three variables can increase the formation rate of HA on the oxide surface. The rising of voltage can enhance surface roughness and reduce the contact angle of the material surface effectively, thus improving the hydrophilcity of the material.