The structure, mechanical, and tribological properties of polyimide (PI) and polyetherimide (PEI) based composites have been studied in the paper. The PEI macromolecular chain is more flexible and contains active oxygen atoms. To impart antifriction properties by forming a transfer film (TF) on the counterface/tribofilm on a sliding surface, the polymers were filled with polytetrafluoroethylene (PTFE) particles. The tribological tests were carried out by the ball-on-disk and block-on-ring schemes under dry sliding friction on metal and ceramic counterfaces. As shown, at point tribological contact, the possibility of shielding the rubbed materials by PTFE film provided the wear rate (WR) and the coefficient of friction (CoF) μ at approximately the same low level regardless of a polymer matrix and a counterface material. At a linear tribological contact, the WR of the PI/PTFE was 2–3 times lower (in contrast to PEI/PTFE) that was caused by a more uniform distribution of solid-lubricant particles in a bulk composite. The revealed structure pattern, in friction against a ceramic counterface, suppressed the formation of wear products at the running-in stage, providing the minimum wear rate WR ~ 0.2·10–6mm3 / N·m at low value μ ~ 0.1. The tribochemical interaction of the steel counterface with the polymer matrix prevented achieving the low value μ > 0.18 for PI/PTFE and this, due to impossibility to adhere a tribofilm, did not allow attaining the wear intensity less than WR < 2·10–6 mm3/N·m. In case of PI/PTFE, the wear rate was higher than 3·10–6 mm3/N·m.
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Buslovich, D.G., Panin, S.V., Alekseenko, V.O. et al. Role of the Matrix and Counterface Material in the Formation of Antifriction Characteristics of PI/PTFE and PEI/PTFE Composites. Russ Phys J 66, 363–371 (2023). https://doi.org/10.1007/s11182-023-02948-7
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DOI: https://doi.org/10.1007/s11182-023-02948-7