J Shanghai Jiaotong Univ Sci

Journal of shanghai Jiaotong University (Science) ›› 2012, Vol. 17 ›› Issue (4): 490-493.doi: 10.1007/s12204-010-1083-2

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Investigation on Mechanism of the Improvement in Tribological Properties of Carbon Fiber Reinforced Polytetrafluoroethylene Composites by Surface Treatment

Investigation on Mechanism of the Improvement in Tribological Properties of Carbon Fiber Reinforced Polytetrafluoroethylene Composites by Surface Treatment

SHANGGUAN Qian-qian1,2 (上官倩芡), CHENG Xian-hua1 (程先华)   

  1. (1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. College of Information, Mechanical and Electronic Engineering, Shanghai Normal University, Shanghai 201418, China)
  2. (1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. College of Information, Mechanical and Electronic Engineering, Shanghai Normal University, Shanghai 201418, China)
  • Online:2012-08-30 Published:2012-11-16
  • Contact: CHENG Xian-hua1 (程先华) E-mail:xhcheng@sjtu.edu.cn

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Abstract: Tribological properties of polytetrafluoroethylene (PTFE) composites filled with differently surface treated carbon fibers (CF), sliding against GCr15 steel under dry sliding conditions, were investigated on a block-on-ring M-2000 tribometer. Experimental results reveal that rare earths (RE) surface treatment reduces the friction and wear of CF-reinforced PTFE (CF/PTFE) composites. Scanning electron microscopy (SEM) investigation of worn surfaces of CF/PTFE composites shows that cracks or pores are visible on the worn surfaces of untreated and air-oxidated composite, while no crack and very few pores present on the worn surface of REtreated composite. The fiber-friction-angling effect makes carbon fibers angled and oriented along the frictional shearing force, and finally parallel to the friction surface, which makes interfacial adhesion become a key factor to tribological properties of CF/PTFE composite. With strong interfacial adhesion between carbon fiber and PTFE after RE surface treatment, carbon fibers are not easily detachable from the PTFE matrix in the process of fiber-friction-angling, which prevents the rubbing-off of PTFE, and accordingly improves the friction and wear properties of the composite.

Key words: polytetrafluoroethylene (PTFE)| carbon fiber| fiber-friction-angling effect| friction and wear| surface treatment

摘要： Tribological properties of polytetrafluoroethylene (PTFE) composites filled with differently surface treated carbon fibers (CF), sliding against GCr15 steel under dry sliding conditions, were investigated on a block-on-ring M-2000 tribometer. Experimental results reveal that rare earths (RE) surface treatment reduces the friction and wear of CF-reinforced PTFE (CF/PTFE) composites. Scanning electron microscopy (SEM) investigation of worn surfaces of CF/PTFE composites shows that cracks or pores are visible on the worn surfaces of untreated and air-oxidated composite, while no crack and very few pores present on the worn surface of REtreated composite. The fiber-friction-angling effect makes carbon fibers angled and oriented along the frictional shearing force, and finally parallel to the friction surface, which makes interfacial adhesion become a key factor to tribological properties of CF/PTFE composite. With strong interfacial adhesion between carbon fiber and PTFE after RE surface treatment, carbon fibers are not easily detachable from the PTFE matrix in the process of fiber-friction-angling, which prevents the rubbing-off of PTFE, and accordingly improves the friction and wear properties of the composite.

关键词: polytetrafluoroethylene (PTFE)| carbon fiber| fiber-friction-angling effect| friction and wear| surface treatment

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