The catalytic effect of boron nitride on the mechanical properties of polyacrylonitrile-based carbon fiber

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• 作者：Hua Wang ; Hao Xiao ; Yonggen Lu ; Junqi Jiang
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：51
• 期：24
• 页码：10690-10700
• 全文大小：2,178 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803
• 卷排序：51

文摘

The influence of BN on the mechanical properties of carbon fibers was investigated. It is found that the Young’s modulus of the derived carbon fibers becomes higher with BN amounts increasing through heat treatments at 1600–2350 °C, while the tensile strength increases at 1600 and 2000 °C and decreases at 2200 and 2350 °C with BN amounts increasing. Carbon fibers’ modulus and strength are increased by 6.6 and 7.4 % at maximum, respectively. It can be interpreted that fiber modulus is mainly determined by the preferred orientation of graphene planes and the shear modulus between them, while the strength of carbon fibers strength is determined by not only the two factors but also defects. Through X-ray diffraction, Raman spectra, and scanning electron microscope analysis, it is noted that BN catalysis enhances the preferred orientation of graphene planes and makes little change on the shear modulus but generates more defects above 2000 °C for fierce reaction.