Abstract
The heat-treatment effect on the structure of a series of well-characterized pyrocarbon specimens prepared in a fluidized bed from CH 4 between 1200 and 2000°C has been analyzed by X-rays. The correlation of the amount of thermally induced structural modifications with the temperature of deposition shows that specimens deposited around and below 1400°C are much more sensitive to annealing than those obtained at higher temperatures. The annealability of a number of structural properties appears to be most pronounced in the specimens deposited around 1400°C. This range of deposition temperature coincides with the region at which the specimens have their lowest degree of crystallinity and the microstructure changes from laminar to isotropic. An interpretation of these results is based on thermodynamic data and on the analysis of the pyrolysis processes which may be responsible for the structural anomalies in the pyrocarbons obtained around 1400°C.
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