石墨/Cr_(2)O_(3)协同改性PTFE/硅灰石材料摩擦学性能  

Tribological Properties of PTFE/Wollastonite Composites Synergistically Modified with Graphite and Cr_(2)O_(3)

作　　者：魏莉岚 魏刚[1] 蒋雨江 许荣霞 吴洁萃 Wei Lilan;Wei Gang;Jiang Yujiang;Xu Rongxia;Wu Jiecui(College of Material Science and Engineering,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学材料科学与工程学院,成都610039

出　　处：《工程塑料应用》2022年第2期117-122,共6页Engineering Plastics Application

基　　金：四川省重点研发计划项目(20ZDYF2404)。

摘　　要：采用电子万能试验机、环-块式摩擦试验机和扫描电子显微镜等分析表征手段,考察了针状硅灰石与石墨(Gr)和Cr_(2)O_(3)并用对聚四氟乙烯(PTFE)复合材料摩擦磨损性能的影响。结果表明,随着硅灰石含量的增加,PTFE/硅灰石复合材料的磨损率逐渐降低,而摩擦系数呈现出先降低后增加的趋势。在15%(质量分数,下同)硅灰石的基础上添加10%Gr时,复合材料的磨损率降低到0.22×10^(-5) mm^(3)/(N·m),摩擦系数略有增大。进一步添加1%Cr_(2)O_(3)代替相应含量的Gr时,PTFE/硅灰石/Gr/Cr_(2)O_(3)复合材料表现出最低的磨损率,仅有0.13×10^(-5) mm^(3)/(N·m),对应的摩擦系数为0.25。磨损机理分析表明:适量硅灰石在摩擦过程中起到了较好的支撑载荷作用,阻止了对偶上微凸体对摩擦表面的嵌入;在此基础上继续添加9%Gr和1%Cr_(2)O_(3)时,对偶上形成了非常致密完整、薄且均匀的转移膜,表现为轻微的磨粒磨损特征。The effects of wollastonite and its combination with graphite(Gr)and Cr_(2)O_(3)on the tribological properties of polytetrafluoroethylene(PTFE)composites were investigated by means of electronic universal testing machine,ring-block friction testing machine and scanning electron microscope.The results indicate that the wear rate of PTFE/wollastonite composites gradually decrease and the friction factor present a trend of first decreasing and then increasing with the increase in the amount of wollastonite.When 10%Gr is added into composite with 15%wollastonite,the wear rate of the composite is reduced to 0.22×10^(-5) mm^(3)/(N·m),and the friction factor increase slightly.When 1%Cr_(2)O_(3)is further added to replace the corresponding content of Gr,the PTFE/wollastonite/Gr/Cr_(2)O_(3)composite exhibite the lowest wear rate that is only 0.13×10^(-5) mm^(3)/(N·m),and its corresponding friction factor is 0.25.The analysis of the wear mechanism show that an appropriate amount of wollastonite play a better role in supporting the load during the friction process,preventing the micro-protrusions on the ring from being embedded into the friction surface.On this basis,when 9%Gr and 1%Cr_(2)O_(3)are continued to be added,a very complete,thin and uniform transfer film is formed on the pair,which behave as a slight abrasive wear characteristic.

关 键 词：聚四氟乙烯 硅灰石 石墨 三氧化二铬 摩擦学性能 

分 类 号：TQ320.1[化学工程—合成树脂塑料工业]