温度对聚酰亚胺摩擦磨损性能的影响

Effect of Temperature on Friction and Wear of Polyimide

栓－盘摩擦磨损试验表明：连续升温时，聚酰亚胺的摩擦因数随温度升高而增大直至最高值０．６６，继而降低至０．１６；定温试验时，其摩擦因数随滑动时间延长很快上升到最高值，继而急速降低到趋于稳定；聚酰亚胺的磨损率随温度升高而增大．扫描电子显微镜观察发现：聚酰亚胺以犁削磨损为主，但随环境温度的升高，磨屑由细微粒状变为大片状直至细长条状；其摩擦磨损行为与材料表层状态密切相关，温度较高时，摩擦热使材料表面产生了低摩擦高磨损的粘流层．

The effect of temperature on sliding friction and wear properties of polyimide(PI) was studied on pinondisc tester. It was found that at continuously varied temperatures the friction factor of PI increased initially to a maximum value (about 0.66), then decreased to 0.15 gradually with increasing temperature. Under a given temperature, friction factor of PI increased rapidly to a maximum value, then decreased to a stable value with increasing sliding time. The wear rate of PI increased gradually with increasing temperature. Worn surface morphology and wear debris of PI were analysed by means of scanning electron microscopy (SEM).It was found that wear of PI was microploughing wear mainly, but wear debris changed fine particle, big platelike to long fibrelike at elevated temperature. At elevated temperature, PI frictional surface consisted of molten layer which had lower friction factor and higher wear rate.