Exploring the friction and wear behaviors of Ag-Mo hybrid modified thermosetting polyimide composites at high temperatur
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
Exploring the friction and wear behaviors of Ag–Mo hybrid modified thermosetting polyimide composites at high temperature Chunjian DUAN1,2, Ren HE3, Song LI1,2, Mingchao SHAO1,2, Rui YANG1,2, Liming TAO1, Chao WANG1, Ping YUAN3, Tingmei WANG1,*, Qihua WANG1,* 1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Institute of System Engineering, China Academy of Engineering Physics, Mianyang 621900, China
Received: 10 January 2019 / Revised: 15 April 2019 / Accepted: 30 May 2019
© The author(s) 2019. Abstract: Polyimide composites have been extensively used as motion components under extreme conditions for their thermal stability and special self-lubricating performance. In the present study, Ag–Mo hybrids as lubricant fillers were incorporated into thermosetting polyimide to prepare a new type of tribo-materials (TPI-1) at high temperature. Comprehensive investigations at different temperatures reveal that the newly developed TPI-1 exhibits a better reduction in friction and wear rate below 100 °C, but all of them increase significantly when the bulk temperature exceeds 250 °C. The wear mechanisms demonstrated that sandwich-like tribofilms with different layers were established at different temperatures, which was further verified by characterization of scanning electron microscope (SEM), Raman spectroscopy, and transmission electron microscope (TEM). Considering the high-performance TPI coupled with Ag–Mo hybrids, we anticipate that further exploration would provide guidance for designing TPI tribo-materials that would be used at high temperatures. Keywords: polyimide; Ag–Mo hybrids; self-lubricating composites; high temperature tribology
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Introduction
The lifespan of many types of machinery is dependent on tribo-materials. Reduction in friction and wear is not only beneficial to energy conservation, but also provides economic benefits by preventing unnecessary maintenance [1]. Self-lubricating polymer-matrix materials demonstrate their potential by replacing some important parts previously made from metal, such as bearings, seals, and so on [2−6]. With rapid developments in science and technology, the application conditions for self-lubricating polymer composites will become more demanding for special requirements in space, such as extremes of both high and low temperatures and high vacuum [7]. The choice of polymer
materials which could be used under a wide range of temperatures is currently limited. With excellent mechanical properties, remarkable heat-resistance and self-lubrication, thermosetting polyimide (TPI) has attracted the attention of researchers in designing lubricating materials [8−13]. However, TPI self-lubricating composites with better wear resistance and lower friction at high temperature is still a challenge. In the search for effective lubricants, numerous studies have been undertaken at
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