High Temperature Structural MaterialsNo Access

PHASE TRANSFORMATION IN SiO₂-Si₃N₄ SYSTEM WITH Li₂CO₃ ADDITIVE

School of Material Science and Engineering, Beihang University, Beijing, 100083, China

Corresponding author: Yue Zhang, born in 1958, professor, Ph.D. supervisor, School of Material Science and Engineering, Tel/Fax: 86-10-82316976.

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ANG LI

School of Material Science and Engineering, Beihang University, Beijing, 100083, China

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DAHAI ZHANG

National key laboratory of advanced functional composite materials, Beijing, 100076, China

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ZONGPING LI

National key laboratory of advanced functional composite materials, Beijing, 100076, China

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https://doi.org/10.1142/S0217979210065787Cited by:0 (Source: Crossref)

Abstract

In the present work, a series of samples were prepared by pressureless sintering from the starting materials of Si₃N₄ (α and/or β phases), SiO₂ and Li₂CO₃. The phase transformation was studied with emphasis on the influence of sintering temperature and Li₂CO₃ content. Related phase transformation was observed and analyzed by SEM and XRD and probable mechanisms were given, which will be helpful for the further explanation to the oxidation mechanism of Si₃N₄ based ceramics at elevated temperature.