The most important applications of carbon fibers utilize their high strength-to-weight ratio, and therefore mechanical properties are of special technological interest (see Table 1.1). Some idea of the potential strength of carbon fibers can be gleaned from R. Bacon’s  study of carbon whiskers, in which he found extensional moduli of 800 GPa [120 Msi (megapounds per square inch)] and breaking stresses of 20 GPa (3 Msi). Since typical tensile strengths of steels are 1 GPa, and their densities are about four times that of carbon, the potential of carbon fibers as structural materials is clear (see Tables 1.1 and 6.1). Actual tensile strength values realized in commercial fibers are lower than those of carbon whiskers, but still offer significant advantages over conventional metals.
KeywordsPorosity Methane Furnace Graphite Carbide
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