【摘要】 利用开炼机制备了丁腈橡胶(NBR)/芳纶浆粕(PPTA-pulp)复合材料。研究了在干摩擦和水润滑条件下,纤维含量、摩擦时间以及载荷对NBR/PPTA-pulp复合材料摩擦磨损性能的影响,并分析了磨损机理。结果表明,芳纶浆粕的加入能够很好地改善复合材料的力学性能和摩擦磨损性能,在相同条件下,当纤维质量分数为20%时,复合材料的综合性能最佳;在干摩擦条件下,随着摩擦时间延长,复合材料的摩擦系数下降,磨耗量增大;随着载荷增加,摩擦系数和磨耗量增大;水润滑条件下,复合材料的摩擦系数和磨耗量较干摩擦大幅度降低且比较稳定,时间和载荷对其影响很小;干摩擦时,复合材料的磨损机理主要为磨粒磨损和疲劳磨损;水润滑时,主要为轻微磨粒磨损。更多还原

【Abstract】 Para-phenylene terephthalamide (PPTA) pulp reinforced nitrile-butadiene rubber (NBR) composites were prepared on mill mixer.The effects of fiber content,friction time and load on the friction and wear properties of the composites under dry condition and water lubrication were investigated and wear mechanisms were discussed.The mechanical and tribological properties of the composites were significantly improved by the incorporation of PPTA-pulp.When the proportion of fiber was 20%(mass),the composite showed the best performance.Under dry condition,the friction coefficient of the composites decreased and abrasion loss increased with the extension of friction time,and they both increased with increasing load.Compared with dry friction,the friction coefficient and abrasion loss of the composites decreased greatly under water lubrication.Besides,they were more stable owing to the lubricating and cooling effects of water.The main wear mechanism of the composites was abrasive wear and fatigue wear under dry friction while the wear mechanism was slight abrasion under water lubrication.更多还原