医用多孔NiTi合金表面溶胶-凝胶法制备TiO_2涂层  

Preparation of TiO_2 Coated Biomedical Porous NiTi Alloys by Sol-gel Method

作　　者：张静娴[1,2] 张新平[1] 孙学通[1] 刘应亮[2] 

机构地区：[1]华南理工大学材料科学与工程学院,广州510640 [2]暨南大学化学系,广州510632

出　　处：《无机化学学报》2011年第2期264-268,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.50871039和No.50671037);华南理工大学中央高校基本科研业务基金(No.2009ZM0160)资助项目

摘　　要：采用溶胶-凝胶法结合浸渍提拉工艺在多孔NiTi合金表面制备出了结构均一的锐钛矿型TiO2涂层,并在溶胶中添加聚乙二醇(PEG)作为造孔剂,进而在多孔NiTi合金表面制备出内层致密、外层多孔的TiO2复合涂层。SEM分析结果表明,TiO2涂层均匀地覆盖了多孔NiTi合金基体的外表面以及孔的内表面。Hanks溶液中的阳极极化曲线结果表明,与未处理的多孔NiTi合金相比,具有致密TiO2涂层的多孔NiTi合金其耐腐蚀性能有了显著提高。而多孔TiO2复合涂层进一步增大了多孔NiTi合金的实际表面积,提高了材料表面的生物活性。A uniform anatase TiO2 layer was dip-coated on porous NiTi alloy via the sol-gel route,and a bilayer composite TiO2 coating consisting of the porous outer layer and the dense layer beneath was also deposited on porous NiTi alloy by adding polyethyleneglycol（PEG） in sol as pore-forming agent.The surface morphology of the TiO2-coated porous NiTi alloy and the cross-sectional structure of coatings show that the TiO2 coatings cover not only the outer surface but also the inner surface of porous NiTi alloy.The corrosion behaviors of the samples in Hanks solution at 37 ℃ show that the dense TiO2 coatings increase the corrosion resistance of porous NiTi alloy significantly.In contrast with dense TiO2 coating,the porous TiO2 composite coating can improve the surface bioactivity owing to the increased surface area.

关 键 词：多孔NITI合金 溶胶-凝胶法 TIO2涂层 多孔TiO2复合涂层 

分 类 号：O614.411[理学—无机化学]