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Keywords:

  • Pyrolytic carbon;
  • chemical vapor infiltration;
  • Raman spectra;
  • texture.

Abstract

The microstructure of carbon/carbon composites obtained by chemical vapor infiltration of carbon-fiber felts was studied comparatively by means of Raman spectroscopy, polarized light microscopy (PLM), scanning electron microscopy (SEM), and X-ray diffraction. The matrices, which are homogeneously textured according to PLM, exhibit pronounced spatial structural gradients at the sub-μm scale if investigated by means of Raman microprobe spectrometry. The Raman and SEM observations demonstrate that the high-temperature treatment correlates with the increasing development of the graphitic ordering in low- and high-textured pyrolytic carbon matrices.