为了阻止金属离子向体液中游离和改善纯钛植入体的生物相容性,采用复合氧化法,即将预阳极氧化及微弧氧化相结合的方法,对纯钛试件进行表面改性.用X射线衍射仪(XRD)、扫描电镜(SEM)和SEM附带的能谱仪(EDS)对薄膜的相组成和形貌进行了分析和观测;用MH-3型显微硬度测试计和WS-97型划痕仪对薄膜的硬度和结合强度进行了测试.结果表明:复合氧化法可以制备出表面多孔、内层致密的二氧化钛梯度薄膜,致密的锐钛矿型二氧化钛薄膜的厚度约为0.7μm,多孔的锐钛矿和金红石混合型薄膜的厚度约为1.7μm.薄膜的表面硬度为370.0HV0.2与基体的结合强度为52.7 N.用复合氧化法制备的多孔二氧化钛梯度薄膜可有效地阻止金属离子的溶出,促进细胞的黏附和生长,临床应用前景广阔.
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