中文摘要：

采用超音速火焰喷涂（HVOF）工艺制备了多峰和纳米结构WC-10Co4Cr金属陶瓷涂层，采用OM、SEM和XRD方法分析了二种不同结构涂层的组织，测量了涂层的力学性能。研究了多峰和纳米结构涂层的干砂冲蚀磨损试验性能，并探讨了涂层的冲蚀磨损机理。结果表明：在HVOF喷涂过程中多峰WC-10Co4Cr粉末中的WC比纳米粉末脱碳程度低；相比于纳米涂层，多峰涂层在30（°）和90（°）冲蚀时抗干沙冲蚀磨损性能分别提高了35%和15%以上。多峰WC-10Co4C涂层具有优异的抗冲蚀磨损性能的主要原因是涂层具有多尺度组织结构、低孔隙率、高显微硬度和高开裂韧性。

英文摘要：

The multimodal and nanostructured WC-10Co4Cr cermet coatings were deposited by High VelocityOxy-Fuel spray(HVOF).Structures of the two kinds of coatings were analyzed with OM、SEM and XRDmethods,and the coatings microhardness and crack toughness were measured.Furthermore,the dry sand erosionwear tests of the WC-10Co4Cr coatings were carried out and the erosion wear mechanisms of the coatings wereexplored.Results showed that compared with the nanostructured WC-10Co4Cr coating,the WC decarburizationof multimodal coating is lower;the nanostructured and multimodal WC-10Co4Cr coatings prepared by HVOFhave dense structure and the porosity of the coatings is below0.5%.Compared with nanostructured coating,thedry sand erosion resistance of multimodal coating is enhanced above35%and15%respectively at the erosion of30(°)and90(°).The main reasons of multimodal WC-10Co4Cr coating with excellent erosion wearresistance are the coating’s dense multi-dimensional structure,low porosity,high microhardness and highcracking toughness.