超音速火焰喷涂CoCrMoSi涂层的组织与性能

Microstructure and Wear-Resistance of Co-Cr-Mo-Si Alloy Coating by High-Velocity Oxy-Fuel Spaying on Continuously Cast Mould

利用超音速火焰喷涂(HVOF)技术在连铸结晶器(CrZrCu合金)表面喷涂CoCrMoSi合金涂层,通过金相显微镜、扫描电镜考察涂层的微观组织,并利用显微硬度计、磨损试验机等研究了涂层的耐磨性能。结果表明:利用HVOF技术制备的CoCrMoSi涂层均匀致密,边界氧化物含量较少,孔隙率为2.83%,涂层平均硬度为840HV,是基体材料的4倍以上;加载150N、磨损3min后,未喷涂试样表面为黏着磨损,磨屑体积为256.594mm3,摩擦系数为0.8027;已喷涂试样表面为磨粒磨损,磨屑体积为1.607mm3,摩擦系数为0.6125;由此可见,CoCrMoSi合金涂层提高了基体硬度,降低了摩擦系数,显著地改善了CrZrCu基体的耐磨性能。

Co-Cr-Mo-Si alloy coating was prepared on continuously cast mould(Cr-Zr-Cu alloy) using high-velocity oxy-fuel(HVOF) spraying.The microstructure of the alloy coating was analyzed by means of optical microscopy and scanning electron microscopy(SEM).The hardness of the alloy coating was measured using a hardness meter,while the friction and wear behavior of the alloy coating was evaluated as well.It was found that the Co-Cr-Mo-Si prepared using HVOF spraying was uniform and compact,having a low content of interfacial oxides and a porosity of 2.83%.Moreover,the alloy coating had an average mico-hardness of 840 HV,4 times as much as that of the Cr-Zr-Cu alloy matrix.Besides,the alloy coating was capable of decreasing the friciton coefficient and greatly increasing the wear-resistance of the alloy matrix.