【作者】 佟伟；

【导师】 李光宪； 杨杰；

【作者基本信息】 四川大学 ， 材料加工工程， 2006， 硕士

【摘要】 聚苯硫醚（PPS）是迄今为止性价比最高、生产量最大的特种工程塑料，由于PPS具有优良的综合性能，其应用领域在不断扩大，市场需求量剧增。作为耐热性高聚物基摩擦复合材料，开发与研究PPS摩擦复合材料势在必行，探讨与分析其摩擦磨损机理，具有一定的实际指导意义。 本论文采用熔融共混法制备了PPS摩擦复合材料，研究了石墨、纳米粒子、聚四氟乙烯（PTFE）及液晶聚合物（LCP）填充改性PPS复合材料，考察了材料的摩擦性能、力学性能，利用扫描电境（SEM）观测了材料的磨损表面、对摩面及脆断面的微观结构与表面形貌，分析其摩擦磨损机理、粒子分散情况及两相结构，采用差示扫描量热法（DSC）初步探讨了填充改性剂对材料结晶的影响。 通过本论文的研究工作，得到了如下研究成果和结论： （1）成功地制备了性能优异的PPS摩擦复合材料，能够满足工程摩擦制件在苛刻环境下的使用要求。目前，我们的研究成果PPS摩擦复合材料已获专利授权，并被推向了实际生产与应用。 （2）考察了填充剂石墨的含量与粒径对PPS复合材料摩擦性能的影响，结果表明：石墨的添加有利于改善材料的摩擦性能，但以纳米石墨填充PPS为宜，含量应不超过10％。将石墨填充到PPS中，材料的对摩面上形成了转移物，材料以磨粒磨损为主。通过DSC测试，发现添加纳米石墨之后，纳米石墨起到成核剂的作用，材料的结晶度及结晶速率都提高了。在PPS中添加纳米Al₂O₃（或纳米SiO₂）有利于降低材料的摩擦系数，但纳米粒子不易分散，极易团聚，对材料的摩擦性能及力学性能有影响。纳米粒子经偶联剂处理后，材料的摩擦性能变化不大，但由于纳米粒子与基体粘结性明显得到提高，材料的力学性能更多还原

【Abstract】 The application and the demand of market of Polyphenylene sulfide （PPS） which was one of the specially engineering plastics with the highest proportion of properties and price were enlarged because of its outstanding combination properties. As one of heat-resistant polymer fiiction materials, it was necessary and significative to exploit and study on PPS friction composites, and to analyze their mechanism of wear.The friction and wear properties as well as the mechanical properties of PPS composites which filled with graphite, nano-inorganic particles, polytetrafluoroethylene （PTFE） and liquid crystalline polymer （LCP） were studied in the paper. To analyze the mechanism of wear and the dispersion of fillers, the worn surfaces and fracture surfaces of PPS composites and the tool steel counterface were observed by means of scanning electron microscope （SEM）. The contributions of the fillers for crystallization of materials were also investigated by differential scanning calorimeter （DSC）.The following conclusions can be drawn from the paper:1. The addition of graphite was contributed to forming the transfer debris on the tool steel counterface. The friction coefficient of PPS composites decreased obviously but the wear loss of them enhanced with the increasing proportions of graphite. The fiiction and wear properties were altered slightly with varying of graphite particle size. The wear loss of composites were mainly caused by abrasive particles. The crystallinity and velocity of crystallization of the composites were increased owing to the presence of graphite which acts as nucleating agent during PPS crystallization.2. The fiiction coefficient of the composites was decreased when PPS was filled with Al₂O₃ or SiO₂ nanoparticles. However, the frictional behaviors and mechanical properties of the更多还原