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利用双辉等离子渗金属技术,对Ti6A14V合金进行等离子渗Zr处理,在其表面形成渗Zr合金层来改善钛合金的耐磨性能。用SEM、EDS及显微硬度计研究了渗Zr合金层的组织形貌、成分分布及硬度变化;对渗Zr处理及未处理的Ti6A14V基材进行了往复球一盘摩擦磨损试验,用SEM、EDS及轮廓仪对比分析了Ti6A14V渗Zr前后在不同载荷下的摩擦学性能。结果表明:在Ti6A14V表面形成的Zr合金层厚度约40μm,组织均匀致密;渗Zr后的表面硬度比未处理的提高了200 HV。渗Zr后的Ti6A14V在2N和5N载荷下的平均摩擦系数分别为0.25和0.15,比未处理基材的摩擦系数减少了0.2和0.1,比磨损率分别是Ti6A14V基材的48%和56%,说明钛合金渗Zr后其减摩和耐磨性能均得到改善。Zr的固溶强化作用是Ti6A14V渗Zr后耐磨性得以改善的主要原因。
Using double hull plasma infiltration metal technology, the Ti6A14V alloy is subjected to plasma infiltration Zr treatment to form a Zr infiltration alloy layer on the surface to improve the wear resistance of the titanium alloy. The microstructure, composition distribution and hardness of the infiltrated Zr alloy layer were investigated by SEM, EDS and microhardness tester. The friction and wear test of Ti6A14V infiltrated and untreated Ti6A14V substrate was carried out. SEM, EDS and profilometer were compared to analyze the tribological properties of Ti6A14V under different loads before and after Zr infiltration. The results show that the thickness of Zr alloy layer formed on the surface of Ti6A14V is about 40μm, and the microstructure is uniform and compact. The surface hardness of Zr alloy increases by 200 HV compared with that of untreated Zr alloy. The average friction coefficient of Ti6A14V after infiltration Zr at 2N and 5N was 0.25 and 0.15, respectively. The friction coefficient decreased by 0.2 and 0.1 compared with the untreated substrate, and the specific wear rates were 48% and 56%, respectively, of Ti6A14V substrate. It shows that the titanium alloy has improved friction and wear resistance after infiltration of Zr. The solid solution strengthening effect of Zr is the main reason for improving the wear resistance of Ti6A14V after Zr infiltration.