Tribological performance of bulk vitrimer composites in simulated lunar environment

Abstract

A high temperature vitrimer, Aromatic Thermosetting Copolyester (ATSP), has demonstrated superior tribological performance in harsh lunar environments, showing great promise for space applications. To enhance the mechanical properties of neat ATSP, filler materials were added. In this study, we examined the friction and wear characteristics of ATSP composite materials under harsh temperatures and abrasive conditions found on the surface of the moon for dynamic seal and bushing applications. We conducted flat pin-on-disk tribological studies to measure the coefficient of friction (COF) and wear rates of different composites against two different bearing-grade steels at different temperatures. Results show that ATSP with milled carbon fiber and graphite as filler materials exhibit exceptional resistance to wear and reduced COF at both cryogenic and high temperatures.