Effect of rare earths surface treatment on tribological properties of carbon fibers reinforced PTFE composite under oil-lubricated condition
来源期刊：JOURNAL OF RARE EARTHS2008年第4期
论文作者：SHANGGUAN Qianqian CHENG Xianhua
Key words：CF/PTFE composites; surface treatment; tribological property; oil-lubrication; rare earths;
Abstract: The effect of rare earths (RE) surface treatment of carbon fibers (CF) on tribological properties of CF reinforced polytetrafluoroethylene (PTFE) composites under oil-lubricated condition was investigated. Experimental results revealed that RE treated CF reinforced PTFE (CF/PTFE) composite had the lowest friction coefficient and wear under various applied loads and sliding speeds compared with untreated and air-oxidated composites. X-ray photoelectron spectroscopy (XPS) study of carbon fiber surface showed that, after RE treatment, oxygen concentration increased obviously, and the amount of oxygen-containing groups on CF surfaces were largely increased. The increase in the amount of oxygen-containing groups enhanced interfacial adhesion between CF and PTFE matrix. With strong interfacial adhesion of the composite, stress could be effectively transmitted to carbon fibers;carbon fibers were strongly bonded with PTFE matrix, and large scale rubbing-off of PTFE be prevented, therefore, tribological properties of the composite was improved.
SHANGGUAN Qianqian1，CHENG Xianhua1
(1.School of Mechanical & Power Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;
2.College of Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai 201418, China;
3.National Engineering Research Center for Nanotechnology, Shanghai 200237, China)
Abstract:The effect of rare earths (RE) surface treatment of carbon fibers (CF) on tribological properties of CF reinforced polytetrafluoroethylene (PTFE) composites under oil-lubricated condition was investigated. Experimental results revealed that RE treated CF reinforced PTFE (CF/PTFE) composite had the lowest friction coefficient and wear under various applied loads and sliding speeds compared with untreated and air-oxidated composites. X-ray photoelectron spectroscopy (XPS) study of carbon fiber surface showed that, after RE treatment, oxygen concentration increased obviously, and the amount of oxygen-containing groups on CF surfaces were largely increased. The increase in the amount of oxygen-containing groups enhanced interfacial adhesion between CF and PTFE matrix. With strong interfacial adhesion of the composite, stress could be effectively transmitted to carbon fibers;carbon fibers were strongly bonded with PTFE matrix, and large scale rubbing-off of PTFE be prevented, therefore, tribological properties of the composite was improved.
Key words:CF/PTFE composites; surface treatment; tribological property; oil-lubrication; rare earths;
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