Abstract
Chemical vapour infiltration of pyrocarbon is analysed with respect to (i) the nature of the hydrocarbon (carbon source), (ii) the pyrolysis chemistry and kinetics of homogeneous gas phase reactions, (iii) the kinetics of heterogeneous pyrocarbon deposition reactions, (iv) pore diffusion in the Fick and Knudsen regime, (v) total pressure, (vi) initial partial pressure of the hydrocarbon, (vii) inert diluent gases and (viii) hydrogen, both as reaction product and non-inert diluent gas. The analysis shows aspects for the optimization of chemical vapour infiltration, and it clearly shows methane to be the ideal hydrocarbon for various reasons.
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