Tribological properties of PAO40@SiO2/PTFE/aramid fabric composites subjected to heavy-loading conditions. (February 2022)

• Record Type: Journal Article
• Authors: Yan, Xiaocui; Yang, Xiao; Qi, Xiaowen; Lu, Gaifen; Dong, Yu; Liu, Changxin; Fan, Bingli
• Is Part Of: Tribology international. Volume 166(2022)
• Publication Date: 2022-02
• Subjects: PAO40@SiO2 microcapsules -- PTFE/aramid fabric composites -- Heavy loading -- Long life; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2021.107336
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: PAO40@SiO2 microcapsules (PSMS) were prepared by adsorbing Poly α-olefin lubricating oil 40# (PAO40) with hollowed SiO2 particles. The tribological properties of polytetrafluoroethylene (PTFE)/aramid fabric composites at different microcapsules contents were evaluated by the ring-block tests. The friction coefficient and wear rate of PTFE/aramid fabric composites containing 6 wt% PSMS (Fabric-6% PSMS) were reduced by 42.9% and 31.5% respectively, as opposed to those of neat PTFE/aramid fabric composites (Fabric-0%). The service life of Fabric-6% PSMS under radial pressure of 240 MPa was increased by 5.3 times as compared with that of Fabric-0%. The wear mechanisms of Fabric-6% PSMS revealed that SiO2 particles promoted the formation of metal-F bonds on the shaft surfaces and further improved the abrasive resistance of transfer films. Highlights: The service life of PSMS/PPFE/aramid liners was prolonged 5.3 times under heavy load as opposed to pure PTFE/aramid liners. The transfer films formed during friction experience island-like spots to layers, and eventually peeled off under heavy load. SiO2 promotes the formation of metal-F bonds between friction pairs, enhancing the wear resistance of the transfer film.