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Effect of Chemical Composition of Intergranular Glass on Superplastic Deformation of β-Silicon Nitride

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Abstract:

In this study, the effect of composition of intergranular glass on superplastic compressive deformation of -Si3N4 has been studied by compression tests. Oxide additives were used to form Y2O3-Al2O3-SiO2 melt and, with increasing temperatures, an oxynitride melt (Y-Al-Si-O-N) by dissolving Si3N4. The relation between flow stress and glass composition qualitatively corresponded to the effect of chemical composition on viscosity of Y2O3-Al2O3-SiO2 glass. However, the rate of increase of the flow stress was not proportional to the viscosity of Y2O3-Al2O3-SiO2 glass, probably because the composition of intergranular glass phase had changed by dissolving Si3N4 and by crystallization of Si2N2O.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

399-402

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.399

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Online since:

August 2006

Authors:

E. Narimatsu, Yutaka Shinoda, Takashi Akatsu, Fumihiro Wakai

Keywords:

Glass, Grain Boundary, Superplasticity, Y-Al-Si-O-N

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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