Tribological behavior and mechanism of <scp>Mo<sub>2</sub>Ti<sub>2</sub>C<sub>3</sub></scp>/polyimide composite films under dry friction condition
Xinrui Wang, Guojing Chen, Yufei Huang, Zhenqian Ma, Xuan Yin, Chunpeng Chai
Abstract
Abstract Polyimide (PI) has good mechanical properties and thermal stability, while high coefficient (COF) and wear rate limit its wide application. In order to endow PI with better friction and wear resistance, Mo 2 Ti 2 C 3 MXene was used as solid lubricant to prepare Mo 2 Ti 2 C 3 /PI nanocomposites with different content of Mo 2 Ti 2 C 3 . The effect of the amount of Mo 2 Ti 2 C 3 on the tribological behavior of PI was explored and the tribological mechanism was also analyzed Tribological tests showed that at 1.2 wt% of Mo 2 Ti 2 C 3 addition, the composite material demonstrated superior friction and wear resistance, exhibiting a 19.9% decrease in the COF and a 79.7% decrease in the wear rate compared to single PI due to the good self‐lubricating properties of Mo 2 Ti 2 C 3 MXene. Moreover, Mo 2 Ti 2 C 3 can also effectively assist PI to form sleek transfer films without interruption or gaps on the steel balls, resulting in a reduced friction COF and wear rate of the material. This work demonstrates that Mo 2 Ti 2 C 3 MXene is an aussichtsreich additive for polymers to improve the tribological properties and broadens the applications of Mo 2 Ti 2 C 3 /PI composites in friction material area. Highlights Mo 2 Ti 2 C 3 significantly improves the tribological performance of polyimide. The thermal properties of Mo 2 Ti 2 C 3 /polyimide are enhanced by the introduction of Mo 2 Ti 2 C 3 . The minimum coefficient of Mo 2 Ti 2 C 3 /PI composites was only 0.246 at the 1.2 wt% content of Mo 2 Ti 2 C 3 . The wear rate of Mo 2 Ti 2 C 3 /PI composites was decreased by 79.7% at the 1.2 wt% addition of Mo 2 Ti 2 C 3 . Mo 2 Ti 2 C 3 promotes the establishment of tribo‐film to protect the Mo 2 Ti 2 C 3 /PI composites from friction.