采用连续高功率固体Nd-YAG激光辐照,使预置于NiTi合金表面的Ti粉在N2环境中形成TiN增强Ti基复合材料涂层.选择适当的激光辐照工艺参数,获得致密的TiN增强金属基复合材料激光改性层.SEM观察及EDAX成分分析结果表明,TiN/Ti金属基复合材料表面改性层与基体NiTi合金存在良好的冶金结合,界面处成分均匀过渡,表面Ni含量极低.显微硬度测试及磨损实验表明,TiN/Ti金属基复合材料改性层显著提高了NiTi合金的表面硬度和耐磨性,激光表面改性层可有效地改善NiTi合金作为生物医学材料使用的表面成分和性能.
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