TC4合金表面TiNi/Ti2Ni改性层不同载荷滑动干摩擦性能研究

利用等离子表面合金化技术在Ti6Al4V合金表面制备了TiNi/Ti2Ni合金层,考察了合金层的表面形貌、成分分布、截面组织形貌、相结构。采用球盘磨损试验机分析了TiNi/Ti2Ni合金层在不同载荷下的滑动干摩擦学性能,并与基体进行对比。结果表明,基体和TiNi/Ti2Ni合金层磨损机制主要表现为磨粒磨损。在同一磨损条件下,TiNi/Ti2Ni合金层的摩擦系数略低于基体,耐磨性优于基体。TiNi/Ti2Ni合金层在不同载荷的摩擦系数接近,在0.29~0.32之间波动。随着载荷的增加,磨损率增加。

Study on Sliding Dry Friction Properties of TiNi/Ti2Ni Modified Layer on TC4 Alloy under Different Loads

TiNi/Ti2Ni alloyed layer was prepared on surface of Ti6Al4V alloy by plasma surface alloying process. Surface morphology, composition distribution, cross-section morphology and phase structure of Ni modified layer were analyzed. Sliding dry friction performance of TiNi/Ti2Ni alloyed layer was observed and analyzed under different loads by Pin-on-disc test, and compared with the TC4 substrate. The results indicate that the wear mechanism of both TiNi/Ti2Ni alloyed layer and the TC4 substrate shows abrasion wear. Under the same wear condition, the friction coefficient of TiNi/Ti2Ni alloyed layer is slightly lower than that of the TC4 substrate, the wear resistance of TiNi/Ti2Ni alloyed layer is better than that of TC4 substrate. Friction coefficients under different loads fluctuate between 0.29~0.33 and wear rate increases with increasing of load.