Abstract
T he effects of high temperature deformation on the isothermal graphitization vs. time characteristics of a substrate- nucleated pyrolytic carbon have been investigated by comparing the x-ray structures of deformed and undeformed samples which had identical heat treatment histories. The deformation was performed in tension parallel to the substrate and in compression parallel or perpendicular to the substrate. In all cases graphitization was enhanced by plastic deformation. The effect appeared to have two components: (1) An immediate and direct influence of the deformation process, and (2) a residual effect due to deformation-induced microstructural changes. Possible mechanisms are discussed and it is concluded that the phenomena result primarily from stress-assisted bond-breaking.
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