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采用热氧化后真空扩散处理工艺 ,在 Ti6Al4V合金表面制备了与基体结合良好的硬化层 ,并在空气和真空条件下分别进行了摩擦磨损试验。结果表明 ,硬化层由表面氧化物薄层和氧扩散区组成。经 81 0℃真空扩散后 ,在表面硬化层有 Ti3 Al相形成 ,使沿层深方向的硬度下降趋势变缓。热氧化 /真空扩散处理可有效地降低在空气和真空中的 Ti6Al4V合金与 GCr1 5钢的干摩擦系数 ,提高 Ti6Al4V合金在空气和真空中的耐磨性
Using the thermal diffusion process after vacuum oxidation, a hardened layer bonded with the matrix was prepared on the surface of Ti6Al4V alloy. The friction and wear tests were carried out under air and vacuum respectively. The results show that the hardened layer consists of a surface oxide layer and an oxygen diffusion zone. After the vacuum diffusion at 8100C, there is a Ti3Al phase in the surface hardened layer, so that the hardness in the depth direction of the layer decreases slowly. Thermal oxidation / vacuum diffusion treatment can effectively reduce the dry friction coefficient of Ti6Al4V alloy and GCr15 in air and vacuum, and improve the wear resistance of Ti6Al4V alloy in air and vacuum