Abstract
The corrosion resistance and cytocompatibility of Ti-20Zr-10Nb-4Ta (TZNT) alloy modified by surface laser treatment were investigated. The scanning electron microscopy (SEM) measurements indicated that laser treatment on TZNT alloy generated groove morphologies with the width of ∼40 μm and the depth of ∼10 μm on the surface. The water contact angles along the groove direction decreased by 51% compared with that of the untreated alloy. The laser treatment promoted the oxidation of metallic Ti, Zr and Nb and produced more stable oxides on surface. The corrosion potential increased by 50% and corrosion current density decreased by 72% compared with that of the untreated alloy in the anodic polarization test for the alloy in Hank’s solution at 37°C. This indicated the improvement of the corrosion resistance by laser treatment. The cytotoxicity testing results showed that the laser-treated TZNT alloy performed similar MC3T3-E1 cell viability compared with the untreated alloy. The cells displayed oriented growth along the groove direction due to the increased hydrophilicity. This novel material may be a new candidate in orthopedics and dentistry implantations fields.
摘要
本文系统研究了激光表面改性对Ti-20Zr-10Nb-4Ta(TZNT)合金耐腐蚀性和细胞相容性的影响. 扫描电镜观察结果表明, 激光改性能够在TZNT合金表面制造沟槽结构, 沟槽宽度大概40 μm, 沟槽深度大概10 μm. 与未处理样品相比, 改性样品表面沿沟槽方向的水接触角减小了51%. 激光处理过程使样品表面金属态的Ti、 Zr和Nb转变成了稳定的氧化态. 在37°C的Hank’s溶液中进行动电位极化测试发现, 改性样品的自腐蚀电位升高了50%, 自腐蚀电流密度下降了72%, 说明激光改性能够提高TZNT合金的耐腐蚀能力. MTT实验结果表明小鼠成骨细胞(MC3T3-E1)在改性样品和非改性样品表面具有相似的细胞活性. 从细胞形貌可以看出, 细胞出现了沿沟槽方向生长的导向性. 综上所述, 新型生物医用TZNT合金有望成为骨科和牙科植入领域的替代材料.
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This work was supported by the National Natural Science Foundation of China (NSFC, 51771011) and the Fundamental Research Funds for the Central Universities (KG12002601).
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Xianda Xue received his bachelor’s degree from Beihang University in 2014. Now he is pursuing his PhD degree (metallic materials) at Beihang University continuously. His research interests focus on the technique improving surface of metallic materials.
Yan Li is a professor of the School of Materials Science and Engineering at Beihang University. He received his PhD degree from Dalian University of Technology in 2001. His current research interests include shape memory materials, biomedical materials, and supercapacitors and battery materials.
Yingchun Guan is currently a professor in the School of Mechanical Engineering and Automation, Beihang University. She received her PhD degree from Nanyang Technological University (Singapore) in 2011. She had been served as Scientist in Singapore Institute of Manufacturing Technology from 2011 to 2014. Her major research interests include laser precision manufacturing and laser additive manufacturing.
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Xue, X., Ma, C., An, H. et al. Corrosion resistance and cytocompatibility of Ti-20Zr-10Nb-4Ta alloy surface modified by a focused fiber laser. Sci. China Mater. 61, 516–524 (2018). https://doi.org/10.1007/s40843-017-9239-3
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DOI: https://doi.org/10.1007/s40843-017-9239-3