二硫化钼改性热塑性聚酰亚胺材料稳定摩擦磨损性能

Tribology Performance During Stable Stage of Molybdenum Disulfide Reinforced Thermoplastic Polyimide

改进MPX-2000摩擦磨损试验机,实现了在线测定材料摩擦磨损性能。实验测定载荷、滑动速度和对偶面粗糙度等工况条件对二硫化钼改性热塑性聚酰亚胺(TPI)基复合材料摩擦磨损性能的影响,结合低真空扫描电子显微镜(FESEM)观察其磨损面形貌的结果分析材料磨损机理。研究表明:在线测定法与传统称重法测定的材料磨损情况基本一致。在线测定结果发现:在材料稳定磨损状况下,随着载荷的增大,材料磨损率增加而摩擦因数降低;随着滑动速度的增大,材料磨损率增加,但其对摩擦因数影响不明显。高速下磨损机理主要是严重的粘着磨损和疲劳磨损;同时发现磨损率与对偶面粗糙度呈非线性关系,经颗粒直径为46μm氧化铝砂纸打磨过对偶面,其材料磨损率最低。

The on-line measurement of the friction and wear properties of materials was carried out by improved MPX- 2000 tribo-tester and the effects of contact pressure, sliding velocity and counterface roughness on the tribological behaviors of molybdenum disulfide reinforced thermoplastic polyimide under dry friction condition were investigated. Based on microprofile of worn surface observe by FESEM, the wear mechanism was determined. It is found that the materials＇ wear results measured by on-line are agreed well with that by traditional weight methods. According to results by on-line measurement, with the increase of the load, the materials＇ wear rate is higher and friction coefficient is lower during stable wear process. And with the increase of sliding velocity, the materials＇ wear is shrewd, but it has little effect on materials＇ friction coefficient, while the adhesive and fatigue wear has a dominate place in high sliding velocity. Meanwhile, it is suggested that the relationship between wear and counterface roughness is not a simple linear and the lowest wear rate is got when the couple was polished by 46 um alumina abrasive paper.