By John D. Buckley, Dan D. Edie
The main parts of carbon-carbon fabrics and composites are defined during this entire quantity. It offers information and expertise at the fabrics and constructions built for the construction of carbon-carbon fabrics and composites. The textual content consists of papers by way of thirteen famous authors of their parts of workmanship in relation to the procedures and construction of those fabric platforms and buildings. the subject material within the publication is prepared to guide the reader via fabrics processing, fabrication, structural research, and functions of usual carbon-carbon items. the knowledge supplied comprises: fiber know-how, matrix fabric, layout of composite constructions, production concepts, engineering mechanics, protecting coatings, and structural purposes utilizing carbon-carbon fabrics and composites.
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Extra info for Carbon-carbon composites
Nazem, F. : Flow of Molten Mesophase Pitch. Carbon, vol. 20, no. 4, 1982, pp. 345-354. 15. Edie, D. ; and Dunham, M. : Melt Spinning Pitch-Based Carbon Fibers. Carbon, vol. 27, no. 5, 1989, pp. 647455. 16. Edie, D. : Pitch and Mesophase Fibers. Carbon Fibers, Filaments and Composites, J. Figueiredo, C . A. Bernardo, R. T. K. Baker, and K. J. , 1990, pp. 647455. 17. Mochida, Isao; Toshima, Hiroshi; Korai, Yozo; and Naito, Tsutomu: Modification of Mesophase Pitch by Blending. Part 2-Modification of Mesophase Pitch Fibre Precursor With Thermoresisting Polyphenyleneoxide (PPO).
Therefore, the microstructures of both PAN-based and pitch-based carbon fibers must be understood before the potential, as well as the limitations, of both types of carbon fiber can be appreciated. Microstructure of PAN-Based Carbon Fibers Early work by Diefendorf and Tokarsky (ref. 14) indicated that the macrostructure of PAN-based carbon fibers, similar to that of many other synthetic precursor fibers, is fibrillar. Although the exact nature of this microstructure has been refined in more recent studies, the ribbon-like undulations (characteristic of a fibrillar structure) are an excellent visualization of the microstructure of PAN-based carbon fibers.
11). Another method is to use solvents such as benzene, heptane, and toluene to first extract a portion of the isotropic pitch. The solvent insoluble portion can be converted to an anisotropic pitch by heating to between 23OoC and 4OO0C for less than 10 min (ref. 12). The anisotropic, or oriented, phase is composed of stacked, polynuclear aromatic hydrocarbon molecules. These molecules tend to be disc-shaped with an average molecular weight of approximately 1000 (although the molecular weight can vary considerably).