在Co基熔覆涂层材料成分与结构设计的基础上,利用脉冲激光诱导原位反应技术,在结晶器Cu合金基体材料上制备陶瓷相增强Co基梯度涂层。利用分析技术对制备涂层的组织结构、成分、性能和涂层形成机理进行了系统研究。结果表明,设计成分的梯度变化成功制备出具有3层梯度的Co基合金涂层,实现了涂层组织与性能的梯度变化。梯度涂层里没有裂纹和气孔缺陷,涂层与Cu合金基体形成冶金界面结合。激光诱导原位生成了纳米级Cr-Ni-Fe-C,MoNi4,Cr7C2,WC1-x等颗粒,起到了增强Co基合金梯度涂层的作用。梯度涂层各层的陶瓷颗粒数量呈现由第1层到第3层逐渐增多的趋势,硬度由铜合金基体的94 HV逐渐增加到最外层涂层的523 HV。涂层中石墨具有改善梯度涂层摩擦性能的作用。 Based on the composition and structural design of the Co-based cladding coating, a ceramic-phase enhanced Co-based gradient coating was prepared on the mold Cu alloy substrate by pulsed laser induced in situ reaction. The microstructure, composition, properties and coating formation mechanism of prepared coatings were systematically studied by using analytical techniques. The results show that Co-based alloy coating with 3-layer gradient was successfully prepared by gradient changes of design components, and the gradient of coating structure and properties was achieved. Gradient coating without cracks and porosity defects, the coating and the Cu alloy substrate to form a metallurgical interface. Laser-induced in-situ formation of nano-scale Cr-Ni-Fe-C, MoNi4, Cr7C2, WC1-x and other particles, played a role in enhancing the Co-based alloy gradient coating. The number of ceramic particles in each layer of gradient coating tends to increase gradually from Layer 1 to Layer 3, and the hardness increases gradually from 94 HV of the copper alloy matrix to 523 HV of the outermost coating. Graphite in coating has the effect of improving the friction performance of the gradient coating.