Journal
WEAR
Volume 516, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2022.204617
Keywords
PTFE; Tribochemistry; Ultralow wear; Transfer film
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Prior studies have shown that mechanical interlocking, preferential adhesion, and PTFE tribochemistry all play a role in reducing wear in polar polymer-filled PTFE composites, but their relationships are poorly understood. This study aimed to investigate the wear and tribofilm environmental sensitivities of a 5 wt% polyamide-imide (PAI) filled PTFE composite to untangle these mechanisms. The results revealed a strong correlation between a carboxylate-salt-rich transfer film and ultralow wear, as well as a tribochemical interface gradient that discourages transfer film removal. It is proposed that PTFE tribochemistry induces ultralow wear through increased transfer film adhesion and cohesion, promoting a surface energy interface gradient beneficial to low wear.
Prior studies suggest mechanical interlocking, preferential adhesion of polar polymers, and PTFE tribochemistry all contribute to the wear reduction in polar polymer-filled PTFE composites; whereas their relations remain poorly understood. This study aims to decouple the relevant mechanisms by investigating wear and tribofilm environmental sensitivities of a 5 wt% polyamide-imide (PAI) filled PTFE composite. The results highlight (1) strong correlation between a carboxylate-salt-rich transfer film and ultralow wear, and (2) a tribochemical interface gradient that discourages transfer film removal. We proposed that PTFE tribochemistry induces ul-tralow wear by significantly increasing (1) transfer film adhesion through a virtuous cycle of tribochemical accumulation and wear reduction and (2) transfer film cohesion by promoting a surface energy interface gradient beneficial to low wear.
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