丁腈橡胶在硬质颗粒环境下的摩擦磨损特性

Friction and Wear Characteristics of Acrylonitrile-butadiene Rubber Under Hard Particles Condition

采用销-盘接触方式考察丁腈橡胶/316L不锈钢配副的摩擦磨损性能,探讨有无Al2O3硬质颗粒及颗粒尺寸对其摩擦学行为的影响。通过扫描电子显微镜(SEM)和表面轮廓仪分析配副材料的磨痕表面形貌。结果表明:硬质颗粒参与磨损能降低接触副表面的摩擦因数;大尺寸颗粒会加速橡胶的磨损并能嵌入橡胶基体形成微切削效应,而随着颗粒尺寸减小至数十微米时,颗粒的存在反而能减缓橡胶的磨损;但颗粒的介入均会加剧配副金属的磨损、硬质颗粒的犁削作用使钢球磨损表面存在大量的犁沟;此外,无颗粒及不同尺寸颗粒环境下丁腈橡胶/不锈钢摩擦副表现出不同的损伤机制。

The friction and wear characteristics of acrylonitrile-butadiene rubber/316 Lstainless steel tribo-pairs were investigated using a sphere-on-disc test device.The influence of Al2O3 hard particles and the particle size on the tribological behavior of the tribo-pairs was discussed.The morphology of worn surface was analyzed viascanning electron microscope（SEM）and by using a surface profilometer.The results show that the particles wear can reduce the friction coefficient of the contact pairs;Large particles can accelerate the wear of rubber and large particles can be embedded into the rubber matrix,resulting in micro cutting effect,however,as particle size decreases to about dozens of microns,the existence of particles can mitigate the wear of rubber;All the particles embedded in the rubber matrix can aggravate the wear of metal counterpart and lots of furrows can be observed on metal worn surface caused by the ploughing effect of hard particles;In addition,the NBR/stainless steel tribo-pairs exhibit different damage mechanism under conditions of no particles and particles with different size.