(太原理工大学 表面工程研究所, 太原 030024)
摘 要: 利用双层辉光离子渗金属技术在Ti6Al4V表面渗Mo, 形成了表面改性合金层, 就910~990℃渗Mo时基体温度对表面合金层性能的影响进行了研究。 结果表明, 渗Mo后的表面合金层由扩散层和沉积层组成, 沉积层呈(211)晶面的择优取向。 随着基体温度的升高, 扩散层的厚度增加, 并且合金层表面粗糙度增大。 渗Mo后的表面合金层硬度较基体Ti6Al4V的大大提高, 而基体温度变化对合金层硬度没有明显影响。 用涂层压入仪对沉积层和扩散层间的结合强度进行了评定。 研究表明, 随着基体温度的升高, 临界压入载荷pc增大, 沉积层和扩散层间的结合强度增大。
关键字: 双层辉光离子渗金属; Ti6Al4V; Mo; 组织; 性能
(Surface Engineering Institute, Taiyuan University of Technology,
Taiyuan 030024, China)
Abstract:Surface alloying layer of molybdenum on Ti6Al4V base was formed by double glow discharge technique. The influence of Ti6Al4V base temperature on the properties of molybdenum alloying layer at 910-990℃ was studied. The results show that the molybdenum alloying layer is composed of deposit layer and diffuse layer. The thickness of diffuse layer and the surface roughness of molybdenum alloying layer increase with increasing the Ti6Al4V base temperature. The microhardness value of molybdenum alloying layer is much larger than that of Ti6Al4V base. The change of Ti6Al4V base temperature has little influence on the hardness of molybdenum alloying layer. The bonding strength between the molybdenum deposit and diffuse layer was studied with the indentation test. The result shows that it increases with increasing the Ti6Al4V base temperature.
Key words: double glow discharge technique; Ti6Al4V; molybdenum; microstructure; property