近等原子比NiTi形状记忆合金具有优异的形状记忆效应、超弹性以及良好的耐腐蚀性.NiTi合金制备的多种生物医学植入体已经实现了临床应用.但是,NiTi合金在体液的长期腐蚀下析出的Ni离子,可能对人体造成过敏、发炎和致癌等风险.介绍了近几年来采用氧化、等离子体和涂层方法对NiTi形状记忆合金进行表面改性的研究进展情况,这些表面处理主要是对NiTi合金表面自然形成的氧化层进行改造,形成更加稳定、耐腐蚀性能更高的新表层,以抑制或者隔绝Ni离子的溶出,从而提高合金在长期使用情况下的生物相容性.分别对这几种改性方法的优缺点进行了总结,最后指出了表面改性研究的未来发展方向.
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