Frictional and wear performance of WC-12Co/MoS₂ composite coatings by detonation-gun sprayed

To further improving the wear resistance of the WC-12Co coatings,different proportions of MoS₂ powders were added into the WC-12Co powders and a series of the WC-12Co/MoS₂ composite coatings were prepared on the Q235 steel by detonation-gun spraying.The morphology,microstructure,micro-hardness,friction and wear performance,and wear behavior of the WC-12Co/MoS₂ composite coatings were investigated by optical microscope,scanning electron microscopy,X-ray diffraction,microhardness tester and wear tester,separately.The results showed that the MoS₂ powders were evenly dispersed in the WC-12Co coatings.When the content of MoS₂ was 2%(wt%),the hardness and density of WC-12Co/MoS₂ composite coating were changed little,but the friction coefficient and wear rate were significantly decreased by 50% and 33% in contrast with those of the WC-12Co coatings,respectively.Both of the friction coefficient and wear rate of the WC-12Co/MoS₂ composite coatings were risen gradually by further increased the content of MoS₂ in the WC-12Co coating.