Abstract
Alloys of pyrolytic carbon and silicon codeposited in beds of fluidized particles were investigated. X‐ray diffraction measurements revealed only two phases, turbostratic C and β‐SiC. Since the C crystallites are oriented randomly, the C was macroscopically isotropic, with apparent crystallite sizes in the range found for pure C deposited under similar conditions. Transmission and scanning electron microscopy showed that the SiC was generally distributed as small particles which tended toward larger particles and continuous laminations at high SiC concentrations. The fracture stress and Young's modulus were measured in 3‐point bending; they increased continuously with increasing SiC content from values for pure isotropic carbons to values for chemically‐vapor‐deposited SiC.
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