ISSN   1004-0595

CN  62-1224/O4

高级检索

水润滑条件下磨粒尺寸对橡胶密封副摩擦学行为的影响

Effect of Abrasive Size on Tribological Behavior of Rubber Sealing Pair under Water-Lubricated Conditions

  • 摘要: 磨粒磨损是各类机械橡塑密封装备的一种典型失效形式. 本文中开展了水润滑条件下磨粒尺寸对O型橡胶密封配副摩擦学行为的影响研究,分析了不同颗粒尺寸下的摩擦系数时变特性,探讨了不同运行阶段下的磨损形貌、颗粒运动特性和损伤失效机制. 结果表明:颗粒尺寸对橡胶/金属密封副的摩擦学性能有重要影响;研究发现了影响摩擦系数和损伤机制的两个颗粒尺寸临界值;当颗粒尺寸大于临界值约75 μm时,颗粒难以穿过密封界面,但少数颗粒能嵌入到摩擦副的接触区两侧,犁削作用下的金属表面产生较深的犁沟;当颗粒尺寸介于两临界值内时,接触副两侧形成“颗粒嵌入带”,颗粒以单独或颗粒群形式嵌入到橡胶内,尽管犁削了配副金属但也起到了良好的承载作用,表现出较低的摩擦系数并减缓了橡胶的磨损;当颗粒尺寸约小于另一临界值12.5 μm时,颗粒能较自由地通过摩擦界面,对配副金属表面起到了抛光效应,但也加速了橡胶的冲蚀磨损,橡胶磨损表面呈现“突脊-犁沟-突脊”交替特征,因此工程上应尽量避免此类现象的发生.

     

    Abstract: Abrasive wear is a typical failure mode of various rubber and plastic mechanical sealing equipment. This study researched effect of the abrasive size on the tribological behavior of O-type rubber sealing pairs, analyzed the time-variant characteristics of friction coefficient under water-lubricated conditions with different abrasive sizes and discussed its wear morphology, particle movement characteristics and failure mechanisms within different operation stages. The result demonstrated that the particle size had a significant influence on the tribological properties of the rubber/metal seal pairs. There were two critical particle size values (approximately 12.5 μm and 75 μm) affecting the friction coefficient and the failure mechanism. When the size was larger than the critical value (75 μm), the particles were impossible to pass through the sealing interface, only a few particles can be embedded on both sides of the contact zone of the friction pair producing a deep furrow on metal surface. When the size was between the two critical values, a “particle-embedded band” on both sides of the contact pair can be observed, and single particle or agglomerated particles are embedded in the rubber. The rubber had a good bearing capacity, and a low friction coefficient with reduced wear of the rubber, although it abraded the counterpart metal. When the size was less than the critical value of approximately 12.5 μm, the particles can pass through the friction interface freely, which polished the surface of the counterpart metal and accelerated the erosion wear of the rubber. The worn surface of rubber presented the alternated “ridge-valley” feature, and this should be avoided.

     

/

返回文章
返回