Acrylonitrile-butadiene rubber (NBR) was conducted with accelerated aging under the thermo-oxidative environment, a test on the tribological performance of aged NBR was carried out using UMT-3 tribo-tester. Based on an aging test at the various aging time and different aging temperatures. The static tensile tester, SEM, EDS, and 3D optical profilometer were used to investigate the changes of rubber mechanical properties and tribological properties with aging temperature and time before and after aging. The performance degradation of the NBR after thermo-oxidative aging, the microscopic morphology of the worn surface, and the evolution of the wear mechanism were discussed. Results demonstrate that the aging temperature and aging time have a substantial influence on the mechanical properties of the rubber. The elongation at break and fracture stress are gradually decreased with the extension of aging time. With an increase in the aging temperature, a small increase in temperature will cause a significant decrease in mechanical properties. Shore hardness of the rubber is more sensitive to the aging temperature changes. With the increasing temperature, the growth rate of shore hardness is changed from low to first fast and then slow. The evolution trends of rubber aging are dividing into three areas: A, B, and C because of different aging degrees, and there are different damage mechanisms between various areas. The wear mechanism gradually changes from adhesive wear to abrasive wear, or fatigue and abrasive wear exist together.
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