Transfer film formation mechanism and tribochemistry evolution of a low-wear polyimide/mesoporous silica nanocomposite in dry sliding against bearing steel

The addition of a kind of mesoporous silica (MPS) can significantly reduce the wear rate of a thermoplastic polyimide (PI) by more than 90%, which is ascribed to the quick formation of high-quality transfer films induced by unique tribochemical reactions [1]. In-situ observation illustrated the morp...

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Bibliographic Details
Published in:Tribology international 2018-04, Vol.120, p.233-242
Main Authors: Ma, Jian, Qi, Xiaowen, Dong, Yu, Zhao, Yuanliang, Zhang, Qinglong, Fan, Bingli, Yang, Yulin
Format: Article
Language:English
Subjects:
ATR-IR
Bearing steels
Bearings
Debris
Decomposition reactions
Evolution
Friction and wear
Morphology
Nanocomposites
Polyimide resins
Polymer matrix composites (PMCs)
Silica
Silicon dioxide
Steel
Transfer film formation
Tribochemistry
Tribology
Wear mechanisms
Wear particles
Wear rate
XPS
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Summary:The addition of a kind of mesoporous silica (MPS) can significantly reduce the wear rate of a thermoplastic polyimide (PI) by more than 90%, which is ascribed to the quick formation of high-quality transfer films induced by unique tribochemical reactions [1]. In-situ observation illustrated the morphology evolution of the transfer films. Further X-ray photoelectron spectroscopy on these transfer films revealed the variation of tribochemical reactions intensity while significant tribochemically induced polymer decomposition and reactions was detected by infrared spectroscopy. Intact and robust transfer films were formed by initial tribochemical adhesion of wear debris and its subsequent accumulation and expansion on the steel surface, which was ascribed to the combined effects of tribochemistry and reduced size and varied morphology of the wear debris. •Formation mechanism of tribofilm is tribochemical adhesion and subsequent accumulation.•The most intense tribochemical reactions occur during very initial run-in stage.•Complex polymer decomposition produces numerous polymer chain ends.•Carboxylate anion chelating to the steel surface increases adhension of transfer films.•Formation of high-quality tribofilm results from tribochemistry, reduced size and varied morphology of wear debris.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2017.12.026