中文摘要：

以纳米和微米级WC-12Co粉末为原料,采用超音速火焰喷涂（HVOF）方法在16Mn基体上制备了两种涂层。利用X射线衍射仪对喷涂粉末及涂层进行了相结构分析,用扫描电镜对喷涂粉末、磨粒磨损前后的涂层表面形貌进行了观察,探讨了粉末结构、涂层的组织和结构以及抗磨粒磨损的性能。结果表明：WC-12Co粉末结构对涂层的组织结构影响非常显著,微米WC-12Co粉末中的WC的分解基本上得到了抑止,而纳米结构的粉末由于出现了WC的部分分解,导致了纳米涂层的抗磨粒磨损性能相对于微米涂层提高不多,但是与基体16Mn相比,两种涂层均表现出优异的抗磨粒磨损性能。

英文摘要：

Nanostructure and conventional WC-12Co feedstock powders were thermally sprayed via high velocity oxy-fuel （HVOF） on the substrate of 16Mn. Phases of the feedstock powders and the coatings were analyzed by XRD. The characterizations of spraying powders, microstructure and surface morphology of the prophase and anaphase attrition surfaces were analyzed by SEM. The influence of structure of feedstock powders and spraying parameter on melt and decomposition of WC during spraying and the structure of coatings and abrasive wear resistance properties were investigated. The results indicate that the conventional WC particles do not decompose obviously during spraying, while nanostructured WC decompose partly, which resulted in weight loss of abrasive wear of nanostructured WC-12Co coating is less slightly than conventional WC-12Co coating, but the two kinds of coatings both display the super properties of the abrasive wear resistance properties compare to 16Mn.