论文部分内容阅读
利用光学显微镜和扫描电镜观察了钛合金表面TiC-Ni激光熔覆层的宏观形貌和微观组织,测试了激光熔覆层的硬度、摩擦系数和磨损量。利用SEM观察了磨损的表面形貌和磨屑的形貌,分析了激光熔覆层的磨损机制。结果表明:激光熔覆层组织致密,无气孔和裂纹,硬度为基材的3倍;激光熔覆层的摩擦系数随环境压力的降低而提高,磨损量随环境压力的降低、法向载荷的增加而增加;低载时为轻微的磨粒磨损,高载时为严重的剥层磨损。
The morphology and microstructure of TiC-Ni laser cladding layer on titanium alloy were observed by optical microscope and scanning electron microscope. The hardness, friction coefficient and wear amount of laser cladding layer were measured. The wear surface morphology and wear debris morphology were observed by SEM, and the wear mechanism of laser cladding layer was analyzed. The results show that the laser cladding layer has compact structure, no pores and cracks, and the hardness is 3 times of that of the substrate. The friction coefficient of laser cladding layer increases with the decrease of ambient pressure. The wear amount decreases with the decrease of ambient pressure. Increase and increase; low load is a slight abrasive wear, high load is a serious peel wear.