纯Ti及Ti-6Al-4V双层辉光离子渗Mo

Double Glow Plasma Surface Molybdenizing of Pure Ti and Ti-6Al-4V

针对钛(T i)合金存在的耐磨性较差的问题,采用双层辉光离子渗金属技术,在工业纯T i和T i合金T i-6A l-4V合金表面渗钼(M o),制备出T i-M o合金层。渗层组织为-βT i(M o)固溶体,成分及硬度均呈梯度分布。利用划痕法研究了渗层与基体间的结合强度,结果表明:渗M o后,持续加载100 N未发生渗层剥落现象;球盘磨损实验表明,T i-6A l-4V渗M o后,比磨损率降低为基体材料的1/500。磨损性能的提高得益于表面合金层中M o元素固溶强化而产生的高硬度。

For the low wear resistance restricts more commonly application of the titanium alloys, Ti-Mo graded alloying layers are produced on the surface of the pure Ti and Ti-6Al-4V alloy by using double glow plasma surface molybdenizing technology for improving the wear resistance. The microstructure of the alloying layer is β phase with the Mo solution. The concentration and the micro-hardness in alloying layer are decreasingly distributed along the case depth. The adhesive strength between the alloying layer and the substrate is studied by using the scratch method. Results show that the alloying layer does not flaked till continuously loading to 100 N. Ball-Plate wear experiments show that the ratio wear rate of Ti-6Al-4V alloy after molybdenizing decreases to 1/500 of the substrate. The high hardness of the alloying layer induced by the Mo solution is benefited to increase the wear resistance of the Ti-6Al-4V titanium alloy.