316L不锈钢等离子渗钛-热氧化制备TiO2膜及性能

为了提高316L不锈钢的表面性能，以满足其在医用环境下服役的要求，利用等离子表面合金化和真空热氧化复合处理技术，在316L不锈钢表面制备TiO₂薄膜。借助金相显微、辉光放电发射谱（GDOED）、x-射线光电子谱（XPS）和x-射线衍射（XRD）分析薄膜的组织结构，以蒸馏水为对象进行光诱导超亲水性试验，用球-盘磨损试验对比测试薄膜与基体的摩擦学性能。结果表明：薄膜均匀致密,Ti、O元素沿层深呈梯度分布,具有锐钛矿型TiO₂结构; 薄膜具有较高的亲水性,可见光照射下,30 min内接触角降为8.5°; 在7.6 N负荷下,薄膜与Al₂O₃陶瓷球对磨时的摩擦系数为0.30~0.40,磨损率仅为1.14×10^-4 mm³·N^-1·m^-1,复合处理后薄膜耐磨减摩性能指标明显优于不锈钢基材.

Preparation and properties of TiO2 film on 316L stainless steel with plasma titanizing-thermal oxidation treatment

In order to enhance the surface performance of 316L stainless steel and thus to meet the service requirements in medical environment, TiO₂ film wasprepared on the surface of 316L stainless steel with both plasma surface alloying and vacuum thermal oxidation technologies. The microstructure of TiO₂ film was analyzed with metalloscopy, glow discharge optical emission spectroscopy （GDOES）, x-ray photoelectron spectroscopy （XPS） and x-ray diffractometer （XRD）. The photoinduced super hydrophilicity test was carried out with taking distilled water as object. A ball on disc wear test was performed to compare the tribological properties of film and substrate. The results reveal that the thin film is homogeneous and dense. Both Ti and O elements show a gradient distribution along the layer depth, and the thin film exhibits an anatase TiO₂ structure. In addition, the thin film shows the higher hydrophilicity, and the contact angle is lowered to 8.5° within 30min under visible light irradiation condition. Under the imposed load of 7.6N, the friction coefficient of thin film with taking Al₂O₃ ceramic ball as friction pair is in the range from 0.30 to .0.40, and the wear rate is only 1.14×10^-4 mm³N^-1m^-1. The wear resistance and antifriction performance of TiO2 film after duplex treatment are much superior to those of stainless steel substrate.