Graphitization of carbon fibre/ glassy carbon composites

Influence of fiber content on the structure and properties of short carbon fiber reinforced carbon foam

“…It confirmed that the fibers promote the graphitization of carbon matrix. As indicated in [16], stress-induced graphitization was an important factor affecting the graphitization of carbon/carbon composites. The stress build-up caused by the large volume shrinkage during carbonization resulted in the graphitization of the carbon matrix near carbon fiber at high temperature.…”

Some observations on stress graphitization in carbon-carbon composites

“…[12] were the first to report detailed characterization of the graphitization behavior of a hard-carbon matrix in a continuous-fiber-reinforced unidirectional C/C composite. They used commercial polyacrylonitrile (PAN)-based carbon fibers with a furfuryl alcohol resin binder.…”

“…This stress reduction would be particularly important if stress graphitization were a high-temperature phenomenon since the graphitization would then be self-limiting. On the other hand, if the oriented precursor structure of the graphitic sheath is formed during pyrolysis, as suggested [6][7][8][10][11][12], and is unaffected by the stresses generated at graphitization temperatures, then the stress relaxation would be relatively unimportant. From a practical standpoint, since the mechanical properties of C/C composites can be strongly influenced by the structure of the matrix immediately adjacent to the fiber, in designing C/Cs, it is of great importance to take into account the matrix stress graphitization that may result from interface stresses generated by different fiber, matrix, and processing combinations.…”

Changes in the microstructure and characteristics of carbon/carbon composites with mesophase mesocarbon microbeads added during graphitization

“…Figure 8 plots the variations in the flexural strengths and moduli of the R0, M10, and M30 composites versus temperature at 600 -2500°C. Figure 8 reveals how the initial flexural strengths and moduli of all of the composites at 600°C were low because of the condensation of the polymer structures in the resin 26 and crosslinks in the oxidative PAN fiber felts. 27 Additionally, abrupt increases in the flexural strength for all composites were observed at 600 -1000°C.…”