碳纤维增强Ag-MoS_2复合材料的摩擦磨损性能

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MoS2,carbon fiber（CF） and special carbon fiber（SCF） were used as lubricants,and three kinds of solid lubricating composite materials（Ag-2.5Cu-8MoS2,Ag-2.5Cu-8MoS2-3CF,Ag-2.5Cu-8MoS2-3SCF） were produced by hot press process.The friction and wear properties of these materials were conducted,and the variation of the friction and wear properties with the various lubrication phases was explored.The results show that,the Ag-2.5Cu-8MoS2 get better friction and wear properties and lower friction coefficient,the wear rate is 24×10-14 m3 /（N?m）,the friction coefficient is 0.122;The addition of carbon fiber can improve the wear resistance of material,and the Ag-2.5Cu-8MoS2-3SCF gains the lowest wear rate（4.08×10-14 m3 /（N?m））,which increases six times over Ag-2.5Cu-8MoS2.However,the addition of carbon fiber obviously increases the friction coefficient of materials,the friction coefficient increases from 0.122 to 0.154（CF） and 0.167（SCF）,respectively.The improving wear strengthening effect is obvious,which is caused by the well wear-resisting property,high hardness（319.369 HV） of the special carbon fiber and the better frictional property of MoS2.采用MoS2、碳纤维（CF）及特种碳纤维（SCF）作为润滑相,制备3种固体润滑复合材料（Ag-2.5Cu-8MoS2、Ag-2.5Cu-8MoS2-3CF、Ag-2.5Cu-8MoS2-3SCF）,对所得材料进行系统的摩擦磨损性能测试,重点关注各润滑相对材料摩擦磨损性能的影响规律。结果表明：独立采用MoS2作为润滑相时可使材料获得较好的摩擦磨损性能和较低的摩擦因数,其磨损率为24×1014m3/（N.m）,摩擦因数为0.122;添加碳纤维能提高材料的耐磨性能,其中添加特种碳纤维所得材料Ag-2.5Cu-8MoS2-3SCF的磨损率最低（4.08×1014m3/（N.m））,其耐磨性能比Ag-2.5Cu-8MoS2的提高了6倍,但添加碳纤维显著增加了材料的摩擦因数,测试过程发现加入碳纤维后材料的摩擦因数由0.122分别升至0.154（CF）和0.167（SCF）。由于特种碳纤维材料较高的硬度（319.369HV）和较好的耐磨性以及MoS2较好的润滑性能,采用特种碳纤维和MoS2对银基材料进行复相润滑可使材料获得较好的综合摩擦磨损性能。