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Effect of Rare Earths on Tribological Properties of Carbon Fibers Reinforced ptfe composites

Journal of Rare Earths 2007年第4期25卷 469-473页

作者：上官倩芡程先华 School of Mechanical & Power Engineering Shanghai Jiao Tong University State Key Laboratory of Tribology Tsinghua University Beijing 100084 China

Carbon fibers （CF） were surface treated with air-oxidation and rare earths （RE）, respectively. The effect of RE surface treatment on tensile strength and tribological properties of CF reinforced polytetrafluoroethylene （ptfe） composites was invest/gated. Experimental results revealed that RE was superior to air ox/dation in improving the tensile strength, elongation, and the tensile modulus of CF reinforced ptfe （CF/ptfe） composite. Compared to the untreated and air-oxidated CF/ptfe composite, the RE treated composite had the lowest friction coefficient and specific wear rate under a given applied load and reciprocating sliding frequency. The RE treatment effectively improved the interfacial adhesion between CF and ptfe. With strong interfacial coupling, the carbon fibers carried most of the load, and direct contact and adhesion between ptfe and the counterpart were reduced, accordingly the friction and wear properties of the composite were improved.

关键词： ptfe composites carbon fiber surface treatment tensile properties tribological properties rare earths

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Effects of fibrous fillers on friction and wear properties of polytetrafluoroethylene composites under dry or wet conditions

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China Particuology 2007年第6期5卷 414-419页

作者： Huaiyuan Wang Xin Feng Yijun Shi Xiaohua Lu State Key Laboratory of Materials-oriented Chemical Engineering Nanjing University of Technology Nanjing 210009 China

The friction and wear behavior and mechanism as well as the mechanical properties of polytetrafluoroethylene （ptfe） composites filled with potassium titanate whiskers （PTW） and short carbon fibers （CF） under dry, wet and alkaline conditions were investigated. Experiments indicated that owing to appropriate cooling and boundary lubricating effects, the filled ptfe composites showed much lower frictional coefficient and better wear resistance under alkaline than dry and wet sliding conditions. The wear resistance of carbon-fiber-filled ptfe was much better than that of potassium titanate-whisker-filled ptfe composites in water. Results also showed that the transfer film on counterpart rings was significantly hindered by water and alkali. Hydrophilic-filler-reinforced ptfe composites yield higher wear rate when sliding under water.

关键词： ptfe composites Whiskers Carbon fibers Friction and wear properties Alkaline solution

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