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利用双层辉光等离子渗金属技术在Ti6Al4V(TC4)上制备钼基改性层以提高材料的摩擦磨损性能。对改性层的组织结构元素分布和显微硬度进行了测试,并采用球-盘滑动磨损试验机对渗层进行摩擦磨损性能测试。结果表明:Ti6Al4V合金表面经过渗Mo、W-Mo及W-Mo-N共渗都可以形成致密、均匀的表面合金改性层;通过三种表面改性后,钛合金的表面硬度都有不同程度提高,其中W-Mo-N共渗表面硬度提高最大,达1504 HV。在较短滑动距离内,渗钼改性层摩擦系数最小,W-Mo-N共渗次之,W-Mo共渗最大。随着摩擦的深入,渗钼改性层摩擦系数很快升高,超过W-Mo改性层。渗钼改性层磨损表现为磨粒磨损和粘着磨损,W-Mo和W-Mo-N共渗都降低了材料的粘着现象,W-Mo-N共渗最为显著。
The molybdenum-based modified layer was prepared on Ti6Al4V (TC4) by double glow plasma infiltration metal technology to improve the friction and wear properties of the material. The microstructure and hardness distribution of the modified layer were tested, and the friction and wear properties of the layer were tested by ball-and-disk sliding wear tester. The results show that the surface modification of Ti6Al4V alloy can be formed by infiltration of Mo, W-Mo and W-Mo-N infiltration, and the surface hardness of Ti6Al4V alloy is different after three kinds of surface modification The W-Mo-N co-infiltration surface hardness increased the most, reaching 1504 HV. In the short sliding distance, the friction coefficient of infiltration molybdenum modified layer is the smallest, followed by W-Mo-N co-infiltration, and W-Mo co-infiltration is the largest. With the deepening of the friction, the coefficient of friction of the molybdenum-infiltrated layer quickly increases, exceeding the W-Mo modified layer. The wear of Mo-modified layer is abrasive wear and adhesive wear. Both W-Mo and W-Mo-N co-permeation reduce the adhesion of materials, and the W-Mo-N co-permeation is the most significant.