目的 改善等离子喷涂WC/Fe复合陶瓷涂层的组织，增强其耐磨性能，并研究激光重熔涂层在不同温度下的耐磨性能。方法 采用激光重熔技术处理等离子喷涂WC/Fe复合陶瓷涂层，利用附带能谱仪（EDS）的扫描电镜（SEM）、X射线衍射仪（XRD）、显微硬度计测试和表征了等离子喷涂涂层在激光重熔前后的组织特征、物相组成及显微硬度，利用摩擦磨损试验机对激光重熔涂层在25、200、400 ℃下的耐磨性能进行了对比考察。结果 等离子喷涂WC/Fe复合陶瓷涂层呈层状结构，经过激光重熔处理后，其片层状结构和孔隙等缺陷基本消失，且激光熔覆区的顶部组织为等轴晶和细小枝晶，熔覆区的底部组织为胞状晶，涂层与基体结合带区的组织为粗大的树枝晶，涂层与基体形成了冶金结合。激光重熔涂层中的WC、W2C、M23C6及Ni6BSi2等高硬度化合物的弥散强化作用，使得激光重熔涂层的显微硬度约为原等离子喷涂涂层的2倍。激光重熔涂层在25 ℃下的磨损亚表层最完好，在400 ℃时出现了微裂纹。结论 重熔能消除等离子喷涂涂层的各种缺陷，得到组织致密的涂层。重熔涂层在不同温度下表现出不同的磨损机理，在25 ℃下表现出最好的耐磨性能。

The work aims to improve microstructure of plasma sprayed WC/Fe composite ceramic coating and improve corresponding wear resistance, and study wear resistance of laser remelted coating at different temperature. The plasma sprayed WC/Fe composite ceramic coating was treated by adopting laser remelting technique. Microstructure characteristic, phase composition and microhardness of the plasma sprayed coating before and after laser remelting was tested and characterized with scanning electron microscope (SEM), X-ray diffractometer (XRD) and microhardness tester, respectively. Wear resistance of the laser remelted coating was compared and investigated at 25 ℃, 200 ℃ and 400 ℃ with a friction and wear tester. Plasma sprayed WC/Fe composite ceramic coating exhibited layered structure. After laser remelting, defects such as lamellar structure and pores nearly disappeared, top structures in laser cladding zone were isometric crystals and fine dendrites. Bottom structures in the zone were afterbirth-like crystals, and structures in coating-substrate binding zone were coarse dendrites, and the coating had metallurgical bonding with the substrate. Dispersion strengthening effect of high hardness compounds such as WC, W2C, M23C6 and Ni6BSi2 in the laser remelted coating made microhardness of the laser remelted coating increase by nearly 1 time than that of the original plasma sprayed coating. Worn sub-surface of the laser remelted coating was the most intact at 25 ℃, and micro-cracks appeared at 400 ℃. Remelting can eliminate various defects of plasma sprayed coating to form dense coating. The remelted coating exhibits different wear mechanisms at different temperature and the best wear resistance at 25 ℃.