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在成功地采用柠檬酸溶胶-凝胶法在硬质合金试样表面制备出MoS2软涂层的基础上,采用扫描电镜形貌观察和摩擦系数测定等实验方法研究了MoS2加入量对涂层表面微观形貌及其摩擦性能的影响规律。结果表明,采用溶胶-凝胶法在1.6mol/L柠檬酸水溶液中分别添加13、20和27g/L MoS2粉末条件下,应用刷涂法均可以在硬质合金试样表面得到与基体结合牢固、表面质量较高的MoS2软涂层。所获得的MoS2软涂层的表面形貌呈片状。MoS2软涂层的存在明显地降低了硬质合金试样的摩擦系数,由硬质合金试样的0.58～0.86降低到软涂层的0.18～0.23。而具有不同MoS2加入量的软涂层间的摩擦系数相差不大。软涂层试样的摩擦系数明显低于硬质合金试样的原因与涂层中存在有摩擦系数低、承载力大等优良性能的MoS2以及软涂层的存在改变了原摩擦副材料间的性质等因素有关。

On the basis of MoS2 soft coating on the surface of cemented carbide was successfully obtained by citric acid sol-gel method,influence of added amount of MoS2 in the coating on surface microscopic morphology and friction coefficient of MoS2 coating was studied by scanning electron microscope and friction test.The results indicated that,MoS2 coatings with high quality and good binding with the substrate on surface of cemented carbide samples can be prepared by sol-gel method of respectively adding 13,20,27g/L MoS2 into 1.6mol/L citrate solution and making one on the surface by burshing.The surface morphology of the MoS2 coating is of lamellar.The samples with MoS2 soft coating significantly reduces the friction coefficient from 0.6-0.8 of original sample to 0.15-0.25.But the adding amount of MoS2 in soft coating has no obvious difference in the friction coefficient.The fact that the soft coating could reduce the friction coefficient of samples could be attributed to the presence of the coating with MoS2,that has advantages of lower friction and great bearing capacity,and changed friction nature between the friction pairs materials becauce of the existence of coating.