医用不锈钢激光合金化铜钴合金的组织及其生物医学性能

Microstructure and Biomedical Properties of Laser Alloyed Cu-Co Alloys on Medical Stainless Steel

在医用不锈钢中加入适量的过饱和铜离子后形成的含铜不锈钢,具有较好的生物功能。用激光合金化方法代替传统的热处理合金化方法,在不锈钢的表面形成铜钴合金层,探索一种以上的合金元素同时存在于合金层中的可能性。采用扫描电子显微镜、X射线衍射仪分析了合金层显微组织的结构特征。通过大肠杆菌实验验证了合金层的杀菌功能,通过盐水腐蚀实验分析了合金层的抗腐蚀能力。结果表明:当激光功率为600 W、扫描速度为400mm/s、预置厚度为500μm、搭接率为35%时,用铜钴质量百分比为1:1的混合粉末制成的合金具有稳定的表面金相组织,其杀菌能力以及耐腐蚀性能较好,且合金层的硬度较基体高约20%。激光合金化方法可以代替传统合金化方法进行生物功能化医用金属的制备。

The copper-containing stainless steels formed by adding a suitable amount of supersaturated copper ions in medical stainless steels have a nice biological function. The laser alloying method instead of the traditional heat treatment alloying method is adopted to form a Cu-Co alloyed layer on the stainless steel surface in order to explore the possibility of more than one alloying element simultaneously existing in the alloyed layer. Scanning electron microscopy and X-ray diffractometer are used to analyze the structural characteristics of the microstructures of the alloyed layer. The antibacterial function of this alloyed layer is verified via the E. coli experiment and the brine corrosion test is used to analyze the corrosion resistance property of this alloyed layer. The results show that the fabricated alloy has a stable surface metallography and good antibacterial ability and corrosion resistance when the laser power is 600 W, the scanning speed is 400 mm/s, the preset thickness is 500 μm, the overlap ratio is 35%, and the mass ratio of Cu to Co in the mixed powder is 1∶1. In addition, the hardness of the alloyed layer is higher by 20% than that of the base. It is proved that the laser alloying method is able to replace the traditional alloying method for the preparation of bio-functionalized medical metals.