粉末钛合金的表面强化技术

Surface Hardening Techniques of P/M Titanium Alloys

低硬度和低耐磨性限制了钛合金尤其是粉末钛合金的实际应用。表面强化技术是提高粉末钛合金表面性能的有效手段之一。综述了近年来为提高钛合金表面硬度和耐磨性而采用的典型的表面强化技术,如激光表面改性、激光熔覆涂层、微弧氧化、离子注入、双层辉光离子渗和高频感应处理等。讨论了每种工艺方法的特点及其所获得表面强化层的结构和性能。最近,乌克兰国家科学院提出氮环境下钛合金的淬水技术,为钛合金表面强化提出了一个新的发展方向。

Low hardness and poor wear resistance constrain the practical applications of titanium alloys, especially for those made by P/M. Surface hardening technique is one of the effective means to enhance the surface properties of P/M Ti alloys. Several typical surface hardening techniques for improving surface hardness and abrasion resistance of titanium alloys are reviewed here, including laser surface modification, laser cladding coating, micro-arc oxidation, ion implantation, double glow plasma surface alloying and high frequency induction treatment, etc. The characteristic of each technique and the structure and properties of the enhanced surfaces by these techniques are discussed. Recently, the National Academy of Science of Ukraine recommends the water-quench technique of titanium alloys in N2 atmosphere, which is a new trend of surface hardening of titanium alloys.