In order to improve the anti-abrasion property of the hydraulic machinery surface,conventional WC-12Co coating was prepared by high velacity oxygen fuel (HVOF)with micron powder.The micro-hardness,porosity,bond strength and anti-abrasion performance of the coating were investigated.Phase composition of the coating was characterized by XRD.The microstructure of the coating and the surface morphology of coating after abrasion test were analyzed by SEM.Abrasion failure mechanism in sandy stream was analyzed as well.The results showed that the coating had 0.83% porosity,the average micro-hardness reached 1 189.7 HV0.2 and the bond strength was more than 62 MPa.The anti-abrasion property of the coating was more than 3 times of the matrix,which effectively improved the anti-abrasion performance of the matrix.In the sandy stream,the abrasion was caused by the sand erosion and the cavitation erosion of gas.%为提高水力机械表面抗磨蚀性能，采用超音速火焰喷涂（HVOF）喷涂微米粉末制备 WC-12Co 涂层，测试了涂层的显微硬度、孔隙率、结合强度及抗磨蚀性能。利用 XRD 表征了涂层的物相组成，并利用 SEM 分析了涂层的微观组织结构及磨蚀后的表面形貌，探讨了涂层在含沙水流中的磨蚀机理。结果表明，获得的 WC-12Co 涂层的孔隙率为0．83％，平均显微硬度达1189．7 HV0．2，结合强度大于62 MPa，其耐磨蚀性能是基体的3倍以上，有效提高基体的耐磨蚀性能。在含沙水流中的磨蚀主要是由沙粒冲蚀和气体气蚀所引起的。
展开▼
