钛合金表面自润滑复合耐磨结构的制备及其摩擦性能研究

本文中采用激光微加工法在TC4钛合金表面制备了不同形貌与分布密度的微观织构，将表面织构、热氧化膜与PTFE润滑薄膜相复合制备了自润滑复合耐磨结构，同时考察了滑动条件下织构形貌及织构密度对这一复合结构摩擦磨损性能的影响. 结果表明：与未织构面的润滑薄膜相比，织构面薄膜的结合力明显增大，表面织构与润滑薄膜的结合显著增强了材料的减摩抗磨性能. 在最优的织构密度下，含有薄膜的织构化钛合金表面的磨损率可降低至1.5×10−6 mm3/(N·m)，较未织构面润滑薄膜的磨损率降低了99.3%. 而将经热氧化的织构表面与润滑薄膜的结合则进一步提升了材料的耐磨性，热氧化织构面润滑薄膜的磨损率最低可达8.0×10−7 mm3/(N·m)，与未热氧化的织构面润滑薄膜相比，磨损率降低了46.1%. 在相同的织构间距条件下，线型热氧化织构面显示出低而稳定的摩擦系数与极低的磨损量，这主要得益于高密度微织构对润滑介质的有效补充以及高硬度热氧化膜的耐磨性起到了协同减摩抗磨的作用.

In this study, micro-textures with different morphologies and distribution densities were fabricated on the surface of TC4 titanium alloy via laser micro-machining. A self-lubricating composite wear-resistant structure was prepared by combining surface textures, thermal oxide films and PTFE lubricating films. Meanwhile, the effects of texture morphology and texture density on the friction and wear performance of this composite structure under sliding conditions were investigated. The results show that: compared with the lubricating film on the non-textured surface, the bonding strength of the film on the textured surface is significantly improved, and the combination of surface textures and lubricating films remarkably enhances the friction-reducing and wear-resistant properties of the material. Under the optimal texture density, the wear rate of the textured titanium alloy surface with lubricating films can be reduced to 1.5×10^-6 mm³/(N·m), which is 99.3% lower than that of the lubricating film on the non-textured surface. Combining the thermally oxidized textured surfaces with lubricating films further improves the wear resistance of the material, and the minimum wear rate of the lubricating film on the thermally oxidized textured surfaces can reach 8.0×10^-7 mm³/(N·m), which is 46.1% lower than that of the lubricating film on the non-thermally oxidized textured surfaces. Under the same texture spacing condition, the linear thermally oxidized textured surfaces exhibit low and stable coefficient of friction and extremely low wear volume, which is mainly attributed to the synergistic friction-reducing and wear-resistant effects of the effective supplement of lubricating medium by the high-density micro-textures and the wear resistance of the high-hardness thermal oxide films.

搜集汇总

背景与挑战

背景概述

该数据集研究了钛合金表面自润滑复合耐磨结构的制备与摩擦性能，通过激光微加工在TC4合金表面制备微观织构，并结合热氧化膜和PTFE润滑薄膜形成复合结构。实验表明，织构和热氧化处理显著增强了润滑薄膜的结合力和耐磨性，在最优条件下磨损率大幅降低，其中线型热氧化织构表现出低摩擦系数和极低磨损量，体现了织构与润滑介质的协同减摩抗磨作用。