Raman microprobe spectrometry of carbon/carbon composites with differently‐textured pyrolytic carbon matrices

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.

Soot Formation in Methane Pyrolysis Reactor: Modeling Soot Growth and Particle Characterization

“…The intensity of the D band relative to that of the G band increases with the degree of disorder. Furthermore, D4 and D3 bands are observed that occur in high-defect carbons such as carbon black and have been assigned to the presence of amorphous carbon (D3) and of hydrocarbon or aliphatic moieties bonded to graphitic basic structural units (D4). ,,− …”