含润滑相的超音速喷涂WC复合涂层性能研究

Study on performance of HVOF WC composite coating with lubrication phase

采用超音速火焰喷涂方法,以传统粉末WC-10Co-4Cr为基体,添加MoS2制备WC-10Co-4Cr/MoS2自润滑复合涂层;利用SEM和XRD对比分析了添加不同含量MoS2的涂层微观组织结构和物相;重点进行了磨粒磨损实验,研究MoS2对超音速喷涂WC涂层摩擦学特性的影响机理;测试了其显微硬度。结果表明:引入的MoS2少部分转化成新态,其余则进入WC涂层空隙中,其显微硬度与未添加MoS2涂层相比略有降低;相同试验条件下,含MoS2涂层有效地降低了磨粒磨损质量损失,提高了涂层的耐磨性;WC-10Co-4Cr/MoS2复合涂层具有很好的自润滑性,MoS2质量百分含量为15%时WC-10Co-4Cr/MoS2复合涂层的摩粒磨损性能最佳。

By adding MoS2 in WC-10Co-4Cr matrix ,the WC-10Co-4Cr/MoS2 matrix self-lubricating composite coating are prepared by HVOF. The mierostrueture and material phases of coatings adding different content of MoS2 are analysed comparatively with SEM and XRD. Focusing on the abrasive wear experiments,the mechanism of MoS2 on the tribologieal properties of HVOF WC coating and its microhardness are studied and tested respectively. The results show that a small part of the added MoSs transforms into a new state and the rest of it enters into the WC coating gap, then the coatings microhardness is slightly lower. The abrasive wear mass loss and wear resistance of the coating containing MoS2 are effectively reduced and improved respectively under the same experimental conditions. WC-10Co-4Cr/MoS2 composite coating has a good performance of self-lubricating,and the grain friction and wear properties of WC-10Co-4Cr/15wt.% MoSs matrix self-lubricating composite coating become the best.