钛合金表面Nb-C复合渗层摩擦磨损性能的研究

Study on frictional wear performance of titanium alloy after surface Nb-C composite treatment

为提高钛合金表面的耐磨性能,采用等离子表面合金化技术在Ti6Al4V(TC4)合金表面形成含Nb的梯度改性层,然后进行渗C复合处理,得到Nb-C复合改性层,研究了改性层的显微组织形貌、成分分布、相结构特征及硬度分布,并进行了球盘摩擦磨损实验.结果表明,Nb、C元素呈梯度分布,合金层主要由Ti、TiC、Nb2C、NbC等相组成,Nb、C复合渗后表面硬度达800 HK.摩擦磨损实验表明,Nb-C表面复合处理后耐磨性明显提高.

To improve the wear resistance of titanium alloy, niobium gradient modified layer was prepared on surface of Ti6A14V （TC4） by plasma surface alloying process firstly, then carburizing was conducted to form the Nb-C composite gradient modified layer. Micro-structure, ingredient distribution, phase structure and hardness distribution of the modified layer were analyzed. Pin-on-disc test was also carried out, and the results indicated that Nb and C elements were distributed by a gradient, the modified layer was mainly composed of Ti, TiC, Nb2C, NbC phases etc. Surface hardness of the modified layer Ti-Nb-C was up to 800 HK. Wear resistance was improved obviously after Nb-C surface composite treatment.