Carbon and graphite cloth reinforced phenolic composites find ablative thermal protection uses as nose tips, heat shields, and rocket nozzle elements. Weight kinetics are used in predicting the performance of these and related materials. The most general source of the necessary kinetic parameters is thermogravimetry. Kinetic parameters n, A, and E were empirically calculated for the pyrolysis of phenolic molding, phenolic/carbon cloth, and phenolic/graphite cloth materials. The empirical kinetic parameters predicted thermograms within 2% residual weight of the parent one. Of three typical bands of disagreement, the largest usually occurred within the third band near 800C. A two-step phenolic/carbon cloth thermogram was in part due to cloth pyrolysis with probable synergistic resin interaction. The graphite cloth was relatively inactive for the phenolic/graphite cloth composite. (Author)
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