钛种植体表面微弧氧化生物改性的研究

目的:探讨采用微弧氧化技术对钛种植体进行表面生物改性,在提高耐磨性、耐腐蚀性的同时,改善材料的生物活性. 方法:配制适当的电解液,试件经预处理后进行微弧氧化处理. 用扫描电镜(SEM)观察陶瓷膜层的表面形貌及横截面形态,用X射线衍射(XRD)仪和X射线能谱(EDX)分析膜层的成分和元素分布,并观察不同电压对膜层性能的影响. 结果:电镜观察表明微弧氧化处理在纯钛试件表面形成了内层致密、外层多孔得的陶瓷膜. 能谱分析证实陶瓷膜由Ti, Ca, P, O 4种元素组成,Ca, P, O元素主要存在于陶瓷膜层,靠近钛基体处的含量极微. Ca, P元素从外向内含量逐渐减少,成梯度变化. X射线衍射表明陶瓷膜由金红石相的TiO2和锐钛矿相TiO2组成. 随着电压的升高,陶瓷膜表面微孔的孔径变大,陶瓷膜内的Ca, P元素含量亦随之升高. 本研究最终使陶瓷膜内的Ca含量达到16%,Ca/P比约为1.67,与骨组织的Ca/P比非常接近. 结论:通过微弧氧化处理在纯钛试件表面形成了内层致密、外层多孔,含适当钙/磷配比的TiO2陶瓷膜,在提高材料耐磨性、耐腐蚀性的同时,提高了生物活性,因而具有良好的应用前景.

Study on surface bio-modification of titanium implant using microarc oxidation technology

AIM: To improve abrasion performance and corrosion resistant of titanium implant and to endow implant with bio activation by surface modification using microarc oxidation technology. METHODS: TA 2 titanium discs were treated using microarc oxidation technology in certain electrolyte. The surface and cross section morphology of ceramic coating was observed with SEM. The element distribution and composition of ceramic coating were analyzed with energy dispersive X ray analysis (EDX) and X ray diffraction (XRD). The effect of different voltage on performance of ceramic coating was also investigated. RESULTS: The results indicated that the coating was porous TiO 2 consisting of rutile and anatase which contained Ca and P element. The distribution of Ca and P in the coating decreased gradually from surface to interior. The size of pore increased with the increasing of voltage. The content of Ca and P element in the coating also increased with the increasing of voltage. The ceramic coating with 16% Ca and 1.67 Ca/P ratio was constructed on surface of titanium discs at last. This Ca/P ratio was similar to Ca/P ratio of bone. CONCLUSION: The TiO 2 coating consisting of compact inner layer and porous outer layer with certain Ca/P ratio was constructed on surface of titanium discs using microarc oxidation technology. The abrasion performance and corrosion resistant of titanium was greatly improved and titanium implant was endowed with certain bio activation by surface modification.