Effect of temperature variation on wear mechanism of liners modified by PAO40/SiO2 microcapsules
Xiaocui Yan, Xiaowen Qi, Xuanbao Xiang, Shifa Pang, Yu Dong, Changxin Liu, Bingli Fan
Abstract
Self-lubircating liners are considered as critical bearing components, which show the primary applications in the aerospace field in a typical operation between − 50–163 ℃ to significantly influence the service life of liners. Therefore, the effect of ambient temperature (−40 to 160 °C) on tribological properties of liners with 6 wt% PAO40/SiO 2 microcapsules friction chromium-plated shaft under 240 MPa was investigated. The results indicate that elevated temperature enhanced the formation of transfer films and associated tribochemical reaction that nonetheless could be restrained at the low temperature level. Wear depth and friction coefficient (COF) of the liner reached 0.052 mm and 0.039 respectively at 80 ℃, mainly due to the synergistic effect of friction reaction, high wear resistance of SiO 2 and uniform density of the transfer film.