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| Polytetrafluoroethylene Composites Filled with Mullite and their Tribological Performance |
LI Cui, SUN Tao, SHI Guojun**( ), YUAN Yue, ZHANG Chenkai |
| School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China |
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Cite this article:
LI Cui, SUN Tao, SHI Guojun, YUAN Yue, ZHANG Chenkai. Polytetrafluoroethylene Composites Filled with Mullite and their Tribological Performance. Chinese Journal of Materials Research, 2016, 30(6): 427-437.
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Abstract Polytetrafluoroethylene (PTFE) composites filled with mullite were prepared by mechanical blending, heat compression and then sintering at elevated temperature. The mechanical properties, crystal structure and thermal properties were characterized by universal material testing machine, X-ray diffraction (XRD) and thermal mechanical analysis (TMA), respectively. The friction coefficient and wear rate of the prepared PTFE composites were tested by an MRH-3 high speed friction and wear tester, and the surface morphologies of the composites after friction test were analyzed by a field-emitting scanning electron microscope. It was found that mullite fillings were well dispersed in PTFE, and the thermal and mechanical properties of the composites were enhanced, such as modulus of elasticity, glass transition temperature and average linear expansion coefficient. The friction coefficients of the prepared composites with mullite fillings less than 10% (mass fraction) were smaller than that of pure PTFE, and the larger friction coefficient was found for those with higher among of mullite fillings. It was more important to find that the wear rate of the composites filled with 40% (mass fraction) of mullite fillings decreased to 1/530 of that for the pure PTFE.
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Received: 03 December 2015
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| Fund: *Supported by the Natural Science Foundation of Jiangsu Province No.BK2012681, Ph.D.Programs Foundation of Ministry of Education of China No.20123250120008, and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions |
| About author: **To whom correspondence should be addressed, Tel: (0514)87937661, E-mail: gjshi@yzu.edu.cn |
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