WC/Co复合涂层微观结构及磨损性能研究

Study on Microstructure and Wear Properties of WC/Co Coating

采用氧-煤油超音速火焰喷涂(HVOF)设备喷涂WC/Co粉末制备高抗磨损复合涂层,表征和分析了WC/Co涂层的微观组织结构、显微硬度、孔隙率和抗磨损性能,并探讨了涂层的摩擦磨损机理。结果表明:获得的WC/Co涂层的孔隙率为0.65%,平均显微硬度达1251.5 HV0.2,涂层抗磨损性能是基体ZG06Cr13Ni4Mo不锈钢的50倍以上。WC/Co涂层具有优良的抗磨损性能的根本原因在于涂层中WC的存在,它使得涂层的显微硬度得到大幅度提高,从而提高了涂层抗磨损的性能。

High anti-wear coatings were prepared by HVOF and micrometer WC/Co powder. The microstructure, micro-hardness, porosity, and anti-wear performance were characterized. Friction and wear mechanism were analyzed as well. The results show that the coating has 0.65% porosity, the average micro-hardness reaches to 1251.5HV0.2. The anti-wear property of the coating is more than 50 times to the stainless steel matrix, which effectively improve the anti-wear performance of the matrix. The reason of high anti-wear performance of WC/Co coating is WC existing in the coating, which improves the coating micro-hardness and anti-wear performance.