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Ti6Al4V合金经800℃、1 h和900℃、15 min热氧化后,分别进行850℃、20 h真空扩散,并将900℃、15 min热氧化+850℃、20 h真空扩散后的试样在25℃和400℃下进行磨损试验,比较真空扩散后的显微硬度分布及处理前后的磨损量,通过XRD、SEM、EDS等分析手段对氧化、氧化/扩散及磨损后的结构和形貌进行测试分析。结果表明:Ti6Al4V合金经热氧化后,表面形成钛氧化物,再经真空扩散后,TiO2发生了分解,在表层和基体间形成了氧扩散层,增加了两者间的结合力,产生了硬化效应,同时形成一定数量的Al3Ti,在不同温度和载荷下,磨损量均比未处理试样的小;经900℃、15 min热氧化+850℃、20 h真空扩散后的Ti6Al4V合金,耐磨性可得以显著提高。
The Ti6Al4V alloy was thermally oxidized at 800 ℃, 1 h and 900 ℃ for 15 min, and then was vacuum diffused at 850 ℃ for 20 h. The samples were thermally oxidized at 900 ℃ for 15 min and heated at 850 ℃ for 20 h. 25 ℃ and 400 ℃, the microhardness distribution after vacuum diffusion and the wear amount before and after treatment were compared. The structure and morphology after oxidation, oxidation / diffusion and wear were analyzed by XRD, SEM and EDS test analysis. The results show that the titanium oxide is formed on the surface of Ti6Al4V alloy after thermal oxidation, and then decomposed by vacuum diffusion. The oxygen diffusion layer is formed between the surface layer and the matrix, increasing the binding force between the two and resulting in hardening Effect, and at the same time a certain amount of Al3Ti was formed. Under different temperatures and loads, the wear amount was less than that of the untreated sample. The Ti6Al4V alloy after thermal diffusion at 850 ℃ and 20 h vacuum diffusion at 900 ℃ for 15 min, Sex can be significantly improved.