Abstract: The phase components, microstructure and Fe, Si element distributions of the reaction zone of the solid state reaction of SiC/Fe were studied by employing
XRD, EPMA and SEM, etc. The reaction products of Fe₃Si, Fe(Si) and graphitic carbon precipitates were generated. The reaction zone is composed of the band
structure, i.e. the modulated carbon precipitation zone (M-CPZ)/ the random carbon precipitation zone (R-CPZ)/the carbon precipitation free zone (C-PFZ) from the
SiC terminal to the Fe terminal, when the couple annealed at 1100℃ for 3h. A model was established to explain the mechanism of SiC/Fe solid state reaction.
During the reaction, the decomposition of SiC is discontinuous, which results in the formation of the M-CPZ of the reaction.

Key words: solid state reaction, decomposition of SiC, solid state diffusion