CeO2对镍基碳化钨激光熔覆层性能的影响

研究了不同激光功率条件下不同含量的氧化铈对镍基碳化钨金属陶瓷熔覆层宏观质量、显微组织及熔覆层横截面硬度的影响。CeO2的掺入均能使镍基碳化钨金属陶瓷熔覆层中的相组织得到细化,裂纹大大减少,宏观质量得到显著改善。随稀土氧化物加入量的增加,稀土的细晶变质作用效果更加明显。当CeO2的含量为0.16wt%时,熔覆层的硬度达到最大约为900HV0.3～1300HV0.3,裂纹基本消失。激光功率对熔覆层的宏观质量、显微硬度及微观组织均有影响,当激光功率低于1.5kW时,难以得到连续光滑的熔覆层;当激光功率高于2.0kW时,熔覆层的晶粒长大,硬度明显降低。

The effect of CeO2 on the properties of Ni/WC cladding layer

The effect of CeO₂ on the macro quality,microstructure and micro hardness of Ni/WC cladding layer has been studied.The results indicate that incorporation of CeO₂ can greatly refine the microstructure,reduce the crack tendency and improve the micro quality of the Ni/WC cladding layer.The refine effect becomes more evident with increasing CeO₂ content.When CeO₂ content is increased to 0.16wt%,the micro hardness reaches its maximum of ca.900HV_0.3～1300HV_0.3 and cracks vanish.Laser power affects the macro quality,microstructure and micro hardness of the cladding layer also.A continuous and smooth layer cannot be obtained if the laser power is lower than 1.5kW,while large crystal particles appears in the cladding layer and the corresponding hardness obviously if the laser power is higher than 2.0kW.