A Model of the Solid State Reaction of SiC/Fe

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.