(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 湘雅附三医院，长沙 410083；
3. 中南大学 湘雅附二医院，长沙 410083；
4. 中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 研究溶胶-凝胶法制备Ti-Ni记忆合金表面复合涂层的工艺，并对涂层结构性能进行测试。结果表明，SiO2复合涂层溶胶凝胶法制备涂层适当的工艺参数如下：聚乙烯醇(PVA)与正硅酸乙酯(TEOS)质量比为1:4，提拉速度为2 mm/min，烧结温度为550℃。通过扫描电子显微分析、原子力显微分析、纳米压痕力学性能分析可知，经上述工艺涂覆后的Ti-Ni形状记忆合金表面形成了均匀致密的SiO2涂层，涂层与基体的结合强度良好。
关键字: Ti-Ni；形状记忆合金；溶胶-凝胶法；SiO2涂层；纳米压痕
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Third Xiangya Hospital, Central South University, Changsha 410083, China;
3. Second Xiangya Hospital, Central South University, Changsha 410083, China;
4. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Preparation and properties of SiO2 composite coating on Ti-Ni shape memory alloy using sol-gel method was investigated. The results show the appropriate processing parameters as follows: mass ratio of polyvinyl alcohol (PVA) to ethyl orthosilicate (TEOS) is 1:4, pulling rate is 2 mm/min, sintering temperature is 550 ℃. Scanning electron microscope, atom force microscope and nano-indentation tester were used to study the SiO2 coating film, the results show that the SiO2 sol-gel composite coating forming on Ti-Ni shape memory alloy is uniform and dense, and the bond strength between the coating and the substrate is fine.
Key words: Ti-Ni; shape memory alloy; sol-gel method; SiO2 coating; nano-indentation
