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材料研究学报  2016, Vol. 30 Issue (6): 427-437    DOI: 10.11901/1005.3093.2015.691
  研究论文 本期目录 | 过刊浏览 |
莫来石填充的聚四氟乙烯复合材料及其摩擦学性能*
李翠, 孙桃, 石国军(), 袁月, 张辰恺
扬州大学化学化工学院 扬州 225002
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
引用本文:

李翠, 孙桃, 石国军, 袁月, 张辰恺. 莫来石填充的聚四氟乙烯复合材料及其摩擦学性能*[J]. 材料研究学报, 2016, 30(6): 427-437.
Cui LI, Tao SUN, Guojun SHI, Yue YUAN, Chenkai ZHANG. Polytetrafluoroethylene Composites Filled with Mullite and their Tribological Performance[J]. Chinese Journal of Materials Research, 2016, 30(6): 427-437.

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摘要: 

采用机械混匀、带温预压、烧结等工艺制备了莫来石填充的聚四氟乙烯(PTFE)复合材料, 通过万能材料试验机、X射线衍射仪(XRD)、静态热机械分析仪(TMA)分别表征了复合材料的力学性能、物相和热学性质; 研究使用MRH-3型高速环块磨损试验机来测试复合材料的耐摩擦磨损性能, 借助场发射扫描电子显微镜研究了复合材料摩擦面形貌并分析摩擦磨损机理。结果表明: 莫来石在PTFE体系中起填充增强作用, 改性聚四氟乙烯复合材料的弹性模量显著增加; 莫来石的填充提高了聚四氟乙烯的玻璃化转变温度, 其平均线膨胀系数也呈下降趋势; 当莫来石的质量分数由0增加至50%时, 复合材料的摩擦系数呈先降低、后升高的趋势, 复合材料的耐磨损性能显著改善; 当莫来石的质量分数为40%时, 其磨损率降低至纯聚四氟乙烯的1/530。

关键词 复合材料聚四氟乙烯莫来石摩擦系数磨损率    
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.

Key wordscomposite    PTFE    mullite    friction coefficient    wear rate
收稿日期: 2015-12-03     
ZTFLH:  TH117TQ325  
基金资助:* 江苏省自然科学基金BK2012681, 教育部博士点基金20123250120008和江苏省优势学科资助项目
作者简介: 本文联系人: 石国军
图1  PTFE、莫来石及PTFE-莫来石复合材料的红外光谱
图2  PTFE、莫来石及PTFE-莫来石复合材料XRD谱
图3  PTFE-莫来石复合材料拉伸性能随莫来石质量分数的变化曲线
图4  PTFE-莫来石复合材料弹性模量随莫来石质量分数的变化图
图5  PTFE及PTFE-莫来石复合材料的拉伸断口形貌
图6  PTFE及PTFE-莫来石复合材料洛氏硬度随莫来石质量分数的变化曲线
图7  PTFE及PTFE-莫来石复合材料的DSC图
Sample Glass transition
temperature /℃
Melting point /℃ Melting heat
/(J/g)
Degree of
crystallinity/%
PTFE 322.8 327.4 20.73 30.04
PTFE+10%Mul 322.1 327.6 23.26 37.08
PTFE+20%Mul 323.0 327.9 17.31 30.10
PTFE+30%Mul 323.2 327.8 16.95 31.93
PTFE+40%Mul 322.4 327.3 15.34 31.12
PTFE+50%Mul 322.4 327.3 13.73 29.85
表1  PTFE及其复合材料的量热性质
图8  PTFE及PTFE-莫来石复合材料的TMA图
Sample Coefficient of linear
expansion (×10-4-1)(30-160℃)
Glass transition
temperature/℃
PTFE 1.31 307.4
PTFE+10% Mul 1.24 311.3
PTFE+20% Mul 1.31 309.0
PTFE+30% Mul 1.26 310.6
PTFE+40% Mul 1.31 310.0
PTFE+50% Mul 1.10 311.0
表2  PTFE及其复合材料的平均线膨胀系数及玻璃化温度
图9  PTFE及PTFE-莫来石复合材料摩擦系数随滑动距离变化曲线
图10  PTFE及PTFE-莫来石复合材料体积磨损率和平均摩擦系数变化的关系曲线
图11  PTFE及PTFE-莫来石复合材料在干摩擦条件下的摩擦面的SEM图和3D激光显微镜图
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