爆炸喷涂WC-12Co/MoS_2复合涂层的摩擦磨损性能

Frictional and wear performance of WC-12Co/MoS_2 composite coatings by detonation-gun sprayed

为进一步提高爆炸喷涂WC-12Co涂层的耐磨性,在WC-12Co合金粉末中添加不同比例的MoS2粉末,利用爆炸喷涂技术在Q235钢表面制备了系列WC-12Co/MoS2复合涂层.采用金相显微镜、扫描电子显微镜、X射线衍射仪、显微硬度计及摩擦磨损试验机对WC-12Co/MoS2复合涂层的微观组织形貌、结构、显微硬度、摩擦磨损性能进行了研究.结果表明,MoS2均匀的分布于复合涂层中,当MoS2含量为2%时,复合涂层的硬度、致密度变化不大,但摩擦系数和磨损率大幅度下降,分别为WC-12Co涂层的50%和36%.随着MoS2含量的增加,复合涂层的摩擦系数和磨损率均呈上升趋势.

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.