使用XRD、EPMA和SEM等研究了SiC/Fe界面固相反应产物的相组成、反应区的显微结构以及反应区中反应物原子的浓度分布。SiC/Fe界面固相反应形成Fe3Si、Fe(Si)和石墨态C沉积物,Fe3Si的形成为该反应提供了足够的热力学驱动力。1100°×3h热处理后,反应区由调整的C沉积物区/均匀的C沉积物区/无C沉积物区(从SiC侧至Fe侧)构成。建立SiC/Fe界面固相反应模型以解释SiC/Fe界面固相反应的微观机理。在SiC/Fe界面固相反应过程中,SiC分解是不连续的,从而在SiC界面前沿形成调整的C沉积物区独特结构。
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.
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