Abstract:

By adding MoS₂ in WC-10Co-4Cr matrix，the WC-10Co-4Cr/MoS₂ matrix self-lubricating composite coating are prepared by HVOF. The microstructure and material phases of coatings adding different content of MoS₂are analysed comparatively with SEM and XRD. Focusing on the abrasive wear experiments，the mechanism of MoS₂ on the tribological properties of HVOF WC coating and its microhardness are studied and tested respectively. The results show that a small part of the added MoS2 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.% MoS₂ matrix self-lubricating composite coating become the best.

Key words: HVOF, abrasive wear, MoS₂, composite coating