Raman spectroscopy investigation of structural and textural change in C/C composites during braking

  • Bao-ling Lei (雷宝灵)
  • Mao-zhong Yi (易茂中)
  • Xu Hui-juan (徐惠娟)
  • Li-ping Ran (冉丽萍)
  • Yi-cheng Ge (葛毅成)
  • Ke Peng (彭可)
Article
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Abstract

The microstructure and texture of C/C composites with a resin-derived carbon, a rough laminar (RL) pyrocarbon and a smooth laminar pyrocarbon, before and after braking tests, were investigated by Raman spectroscopy. The full width at half maximum (FWHM) of the D-band indicates the amount of defects in the in-plane lattice, while the G-to-D band intensity (peak area) ratios (I G/I D) is used to evaluate the degree of graphitization. The results show that the FWHM of D-band of sample with RL pyrocarbon changes greatly from 36 cm−1 to 168 cm−1 after braking tests, which indicates that a large number of lattice defects are produced on its wear surface. However, the graphitization degree of resin-derived carbon sample rises significantly, because the I G/I D increases from 0.427 to 0.928. Braking tests under normal loading conditions, involving high temperature and high pressure, produce a lot of lattice defects on the wear surface, and induce the graphitization of the surface. Sample with RL pyrocarbon having a low hardness is easy to deform, and has the most lattice defects on the wear surface after braking. While raw materials with resin-derived carbon have the lowest graphitization degree which rises greatly during braking.

Key words

C/C composites Raman spectroscopy graphitization degree braking 
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Copyright information

© Central South University Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Bao-ling Lei (雷宝灵)
    • 1
  • Mao-zhong Yi (易茂中)
    • 1
  • Xu Hui-juan (徐惠娟)
    • 1
  • Li-ping Ran (冉丽萍)
    • 1
  • Yi-cheng Ge (葛毅成)
    • 1
  • Ke Peng (彭可)
    • 1
  1. 1.State Key Laboratory of Powder MetallurgyCentral South UniversityChangshaChina

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