Fretting tribocorrosion properties of anodized TiNbSn implant alloy
Fretting tribocorrosion properties of anodized TiNbSn implant alloy
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DOI：
10.1016/j.surfcoat.2023.129492
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发表时间：
2023-04-13
影响因子：
5.4
通讯作者：
Inoue，H.
中科院分区：
文献类型：
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作者：
Kubota，M.;Masahashi，N.;Inoue，H.
钛及其合金耐磨性差，对产生的磨损碎屑的生物学反应导致无菌性松动和病理性骨吸收。在人工髋关节微动磨损中，磨损表面的相当一部分是通过弹性变形接触的，电化学阳极氧化是一种很有前途的控制表面力学性能和提高耐磨性的方法。为了抑制磨损碎屑的产生和金属离子从植入物材料洗脱到体液中，在模拟体液中评价了新开发的阳极氧化TiNbSn植入物合金的摩擦腐蚀性能，并与纯钛进行了比较。在高压阳极氧化过程中，TiNbSn电极发生了介电击穿引起的火花放电，而Ti电极则没有发生。TiNbSn合金阳极氧化膜的主相为金红石型TiO2，而Ti合金阳极氧化膜的主相为金红石型TiO2。TiNbSn上的阳极氧化层比阳极氧化的Ti具有更高的厚度、粗糙度和表面积。此外，硬度和剥离强度高于Ti。在微动测试中，阳极氧化TiNbSn的摩擦系数与阳极氧化Ti的摩擦系数相似或略低，阳极氧化TiNbSn的开路电位保持不变，但阳极氧化Ti的开路电位变为更负的电压。结果表明，高压阳极氧化过程中火花放电在TiNbSn表面形成了坚硬的金红石型TiO2膜，提高了TiNbSn的抗微动磨损性能，减少了磨屑的产生和金属离子的溶出。
Titanium and its alloys have poor wear resistance, and the biological response to generated wear debris leads to aseptic loosing and pathological bone resorption. In the fretting wear of artificial hip joints, a significant part of the wear surface is contacted by elastic deformation, and electrochemical anodization is a promising method to control the mechanical properties of the surface and improve wear resistance. To suppress wear debris generation and metal ions elution from implant materials into body fluids, the tribocorrosion properties of a newly developed anodized TiNbSn implant alloy were evaluated in the presence of simulated body fluid and compared to those of pure Ti. During anodization under high voltage, spark discharge occurred due to dielectric breakdown occurred for the TiNbSn electrode, but not for the Ti electrode. The primary phase of the anodic oxide layer on TiNbSn alloy was rutile TiO2, whereas that on Ti was anatase TiO2. The anodic oxide layer on TiNbSn had a higher thickness, roughness, and surface area than that on anodized Ti. In addition, the hardness and exfoliation strength were higher than those of Ti. The coefficient of friction of anodized TiNbSn in fretting tests was similar or slightly lower than that of anodized Ti, and the open circuit potential remained unchanged for anodized TiNbSn but shifted to a more negative voltage for anodized Ti. The results suggest that the hard and strongly-adhered rutile TiO2on TiNbSn formed by spark discharge during the high-voltage anodization process improves fretting wear resistance and reduces the generation of wear debris and elution of metal ions.