Ti6Al4V钛合金表面火焰喷焊WxC层耐磨性分析

Research of Wear Resistance to Flam Spray-welding WxC Coating on Ti6Al4V Titanium Alloys Substrate

摘要:

采用“一步法”火焰喷焊法在Ti6Al4V钛合金上制备Ni60过渡层、WxC+Ni60强化层，喷焊层在氩气气氛中冷却，避免了涂层的氧化。过渡层与基体结合良好，没有孔洞等缺陷；强化层中碳化钨颗粒呈弥散分布，与过渡层界面处存在大量的孔洞。喷焊层硬度为1230HV，相比基材，硬度提高了3倍多；相比基材，摩擦系数降低60%以上。喷焊层与GCr15和Si3N4对磨后，喷焊层无明显磨损，对磨副GCr15和Si3N4磨损严重，喷焊层表现出优异的耐磨性

Abstract:

This paper use “one step method” flame spray-welding to make wear resistance coating, use Ni 60 powder to make transition layer, and use WxC+Ni60 powder to make strenthening layer. The coating was cooled in Ar atmosphere, this can avoid oxidation. The transition layer has good bonding with Ti6Al4V substrate, there no holes and other defects. The tungsten carbide particles are disperse in the strengthing layer, there are a lot of voids at the interface the transition layer/ strengthening layer. The hardness of strgenthening layer is 1230HV, which is more than 3 times higher than Ti4Al4V substrate. Compared with Ti6Al4V substrate, the friction cofficient is reduced about 60%. The spray-welding layer grinded with GCr15 and Si3N4, the layer has no obvious wear, but GCr15 and Si3N4 wear serious, respective. The spray-welded layer shows excellent wear resistance.