Abstract
NaCl particles were added into Polyetheretherketone (PEEK) and its composites to produce porous PEEK-based materials by washing NaCl away after the high-temperature compression molding process. After that, an ionic liquid was added into the porous materials under vacuum condition. Carbon fibers (CF), as reinforcement, and PTFE, as an internal solid lubricant, were employed to prepare PEEK composites. Tribological properties under dry friction condition were studied on a ring-on-disc tribo-meter. The influence of CF and PTFE on tribological properties was carefully investigated. The results indicated that, in comparison with traditional PEEK composites (CF/PTFE/PEEK), the porous PEEK composites containing ionic liquid showed much better tribological properties. It is found that CF can help PEEK form effective pores to suck in the ionic liquid resulting in a better tribological performance. CF reinforced porous PEEK containing ionic liquid (p-CF/PEEK + IL) demonstrated the lowest friction coefficient (27% of CF/PTFE/PEEK) and the lowest wear loss (only 0.9% of CF/PTFE/PEEK). Long time tribological test revealed that the wear mass loss comes from the running-in period, while its wear is negligible after this period. It is also found that the addition of PTFE has a negative influence on the tribological behaviors, especially under high sliding velocity and applied load.
Highlights
Self-lubricating engineering polymers, a kind of materials that can reduce friction by forming a third transfer film during sliding, are ideal sealing and wear-resistant materials [1,2,3,4]
Polymer-based self-lubricating composites coupled with steel under dry friction condition have many advantages over steel-steel pair under the oil-lubricated condition, such as light weight, strong resistance to high temperature and high vacuum, green with less contamination, etc. [5,6]
Graphite, and short fibers like carbon fibers (CF) and glass fibers (GF) are normally incorporated in self-lubricating polymers to improve their properties [7,8]. It is well-known that the fibers can increase the mechanical strength and loading capacity, while the solid lubricants contribute to lower friction coefficient and wear [9,10]
Summary
Self-lubricating engineering polymers, a kind of materials that can reduce friction by forming a third transfer film during sliding, are ideal sealing and wear-resistant materials [1,2,3,4]. E.g., PTFE and graphite, and short fibers like carbon fibers (CF) and glass fibers (GF) are normally incorporated in self-lubricating polymers to improve their properties [7,8]. It is well-known that the fibers can increase the mechanical strength and loading capacity, while the solid lubricants contribute to lower friction coefficient and wear [9,10]. It has been proved that using a small amount of lubricant (oil-less condition) can greatly reduce the friction and improve the wear resistance of polymer composites [14]. Loy and Sinha et al [15]
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