中文摘要：

利用高速火焰喷涂在304不锈钢表面制备CoNiCrWC涂层，再利用5kW横流CO2激光对涂层熔凝。通过扫描电镜（SEM）观察熔凝层组织结构，测试并分析熔凝层显微硬度、耐磨性。实验结果表明，激光熔凝层与基材形成良好的冶金结合，熔凝层组织均匀：熔凝层显微硬度平均硬度为HV0．2964．314，明显高于基材硬度；在相同的奈件下，熔凝层的耐磨性比基体有了明显的提高。磨损体积减少了约89％。通过对磨损后的试样进行粗糙度观察后表明，涂层具有更平滑的表面。

英文摘要：

HVOF of CoNiCrWC powders on 304 steel substrate is conducted,and the 5kW continuous wave CO2 laser was used to clad composite coatings.The morphologies of the composite coatings by laser solidification were observed with scanning electron microscopy （SEM）. Hardness and wear resistance of the solidification coatings was test and analyze. The results show that the metallurgical bonding formed coatings and substrate; The average micro-hardness of the coatings are HV0.2964.314, which is much higher than the substrate; The wear volume is reduced by about 89%. Roughness measurement of the specimens shows that the cladding layer is smoother.