中文摘要：

以微米颗粒结构的传统WC-Co粉末为原料．采用球磨的方法．制备双尺度结构的WC-12Co粉末．采用冷喷涂方法制备双尺度结构WC-12Co涂层．通过扫描电镜观察发现，涂层及喷涂粉末中WC颗粒的粒度呈双峰分布．通过x射线衍射分析比较球磨前后粉末、喷涂粉末及涂层的相结构。发现在涂层制备过程中WC和Co两相结构能够在涂层中完全保留下来．涂层的硬度及断裂韧性分别为1650Hv（0．3）和13．9MPa·m^1/2．

英文摘要：

Bimodal-sized WC particles were prepared by ball-milling process. Spray powder was fabricated by sinter-crushing of ball-milled powders. Bimodal WC-12Co coating was deposited by cold spraying. It was found that the WC particle size distribution in the coating was the same as the that of the powder through SEM analysis. The XRD results showed that the WC and cobalt phases were retained into the coating from powders. The hardness tests yielded a coating hardness of 1650 Hv0.3, which was compara- ble to that of bulk nano WC-12Co, and the fracture toughness of 13.92 MP·m^1/2 , which was comparable to that of bulk micro WC-12Co.