Studies on Nitrogenization Reaction in Liquid-phase Sintering of SiC Ceramic

Abstract

Abstract: SiC ceramic was sintered through liquid phase by using SiO₂ as the sintering additive. Mixed NO₂ and CO gas was used as the sintering atmosphere. The microstructure of the densified SiC ceramic was observed by using transmission electron microscopy(TEM), Bar-like ting crystal was found to distribute in the intergranular phase. The crystal was identified by spatially-resolved electron energy-loss spectroscopy(EELS) to be SiO₂NO₂O. It is suggested that nitrogen, coming from the sintering atmosphere, attends the chemical reaction in SiC ceramic at sintering temperature and is responsible for the appearance of the SiO₂NO₂O crystalline.

Key words: SiC, Nitrogenization, Microcrystal with nanometer scale, Liquid-phase sintering

CLC Number:

O611

TrendMD:

YE Yu-Han, HE Bang-Shun, WANG Cun-Kuan . Studies on Nitrogenization Reaction in Liquid-phase Sintering of SiC Ceramic[J]. Chem. J. Chinese Universities, 2002, 23(3): 364.

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Studies on Nitrogenization Reaction in Liquid-phase Sintering of SiC Ceramic

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