金属热处理 ›› 2025, Vol. 50 ›› Issue (6): 276-281.DOI: 10.13251/j.issn.0254-6051.2025.06.042

• 表面工程 • 上一篇    下一篇

激光表面淬火对医用NiTi合金组织与耐蚀性的影响

李春林1, 闫文霞2, 李伯琼1, 史宇翔1, 贾昌明1, 赵玉鑫1   

  1. 1.晋中学院 材料科学与工程系, 山西 晋中 030619;
    2.山西白求恩医院(山西医学科学院), 山西 太原 030032
  • 收稿日期:2025-01-20 修回日期:2025-04-18 出版日期:2025-06-25 发布日期:2025-07-08
  • 通讯作者: 李伯琼,教授,博士,E-mail:lbq@jzxy.edu.cn
  • 作者简介:李春林(1986—),男,讲师,博士,主要研究方向为医用金属表面改性,E-mail: lichunlin@jzxy.edu.cn。
  • 基金资助:
    晋中学院博士启动基金(2022-0001493);山西省科技创新青年人才团队项目(202204051001005);山西省青年科学研究项目(202303021222325)

Effect of laser surface quenching on microstructure and corrosion resistance of medical NiTi alloy

Li Chunlin1, Yan Wenxia2, Li Boqiong1, Shi Yuxiang1, Jia Changming1, Zhao Yuxin1   

  1. 1. Department of Materials Science and Engineering, Jinzhong University, Jinzhong Shanxi 030619, China;
    2. Shanxi Bethune Hospital (Shanxi Academy of Medical Sciences), Taiyuan Shanxi 030032, China
  • Received:2025-01-20 Revised:2025-04-18 Online:2025-06-25 Published:2025-07-08

摘要: 为提高医用NiTi合金在生理环境中的耐蚀性和细胞相容性,借助激光表面淬火对NiTi合金进行表面处理,表征了淬火前后NiTi合金表面形貌及相组成,研究了在模拟体液(SBF)中的耐蚀性及细胞相容性。结果表明,激光表面淬火后,NiTi合金表面组织由细小等轴晶转变为粗大条状晶,产生了<110>织构并形成氧化层,疏水性提高,当激光功率为220 W时,组织中出现B19相。条状晶尺寸及表面氧化程度与激光功率正相关。晶粒粗化及表面氧化导致淬火态NiTi合金在模拟体液中的自腐蚀电流密度降低一个数量级。其中180 W激光淬火试样的耐蚀性最佳,自腐蚀电位为-0.40 V,相比于未处理NiTi合金提高0.15 V,浸泡在液体介质中24 h后释放的Ni2+浓度最低,为130.6 μg/cm2,有利于成骨细胞增殖。

关键词: NiTi合金, 激光表面淬火, 组织, 耐蚀性, 细胞相容性

Abstract: To improve the corrosion resistance and cytocompatibility of medical NiTi alloy in physiological environments, laser surface quenching treatment was applied to the NiTi alloy. The surface morphology and phase composition of the NiTi alloy before and after quenching were characterized, and the corrosion resistance and cytocompatibility in simulated body fluid (SBF) were studied. The results show that after laser surface quenching, the surface microstructure of the NiTi alloy is changed from fine equiaxed grains to coarse rod-like grains, with the formation of <110)> texture and an oxide layer, which result in improvement of hydrophobicity. When the laser power is 220 W, the B19 phase appears in the microstructure. The size of the rod-like grains and the degree of surface oxidation are positively correlated with the laser power. Grain coarsening and surface oxidation result in a reduction of self-corrosion current density of the quenched NiTi alloy in SBF by an order of magnitude. The 180 W laser quenched specimen exhibits the best corrosion resistance, with a self-corrosion potential of -0.40 V, representing a 0.15 V improvement compared to that of untreated NiTi alloy. After 24 h of immersion in liquid medium, the lowest concentration of released Ni2+ is 130.6 μg/cm2, which is beneficial to osteoblast proliferation.

Key words: NiTi alloy, laser surface quenching, microstructure, corrosion resistance, cytocompatibility

中图分类号: