中文摘要：

以团聚烧结工艺制备的多尺度WC-12Co、WC-10Co-4Cr和WC-17Co粉末为原料,利用冷喷涂沉积多尺度WC-Co金属陶瓷涂层,研究了涂层的组织和相结构,测定了涂层的显微硬度、弹性模量和断裂韧性,并通过销-盘磨损实验测定了涂层的耐磨损性能。结果表明：3种冷喷多尺度WC-Co金属陶瓷涂层组织均比较致密,涂层保持与原始粉末相同的相结构,粘结相Co由于强烈塑性变形发生了部分同素异构转变,涂层组织无传统层状结构,WC颗粒呈现微米、亚微米及纳米多尺度分布特征;随着喷涂粉末中粘结相含量的增加,涂层硬度和弹性模量降低、断裂韧性增加,其磨损失重有所增加;涂层磨损失效机理主要为磨粒对涂层的切削作用。

英文摘要：

Three kind of multiple-dimensioned WC-Co cermet coatings were prepared by cold spraying of WC-12Co, WC-10Cr-4Cr and WC-17Co powders. The microstructure and phase structure of three kinds of multiple-dimensioned WC-Co coatings are analyzed. Their micro hardness, Young＇ s modulus and frac- ture toughness are investigated, and the wear performances of three coatings are tested on a pin on disk tester. It was revealed that three cold sprayed multiple-dimensioned cermet coatings had dense micro- structure and similar phase structure with that of feedstock powder. The allotropic transformation of metal Co occurred due to its intensive plastic deformation. The coatings have no lamellar structure of conven- tional thermal spraying coating and the WC particles in the coatings are distributed in a size range of mi- crometer, submicrometer and nanometer scale. Moreover, the micro hardness and Young＇ s modulus of coatings decreased, fracture toughness and wear weight loss increased with increasing binder phase con-tent. The wear mechanism was mainly the micro-cuts effect of abrasive particle on the coating surface.