Study on surface bioª²modification of titanium implant using microarc oxidation technology

    MA Chuª²Fan, LI Dongª²Mei, JIANG Baiª²Ling, LI Heª²Jun

    1Institute of Material Science and Material Engineering£¬ Northwestern Polytechnical University£¬ Xi¡¯an 710072£¬China, 2Department of Prosthodontics£¬ Stomatological College£¬ Fourth Military Medical University£¬ Xi¡¯an 710033£¬ China, 3Institute of Material Science£¬ Xi¡¯an University of Technology, Xi¡¯an 710048£¬ China

    ¡¾Abstract¡¿ AIM£º To improve abrasion performance and corrosion resistant of titanium implant and to endow implant with bioª²activation by surface modification using microarc oxidation technology. METHODS£º TA2 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 Xª²ray analysis (EDX) and Xª²ray diffraction (XRD). The effect of different voltage on performance of ceramic coating was also investigated. RESULTS£º The results indicated that the coating was porous TiO2 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£º The TiO2 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 bioª²activation by surface modification. ......