Preprints of Annual Meeting of The Ceramic Society of Japan
Preprints of Fall Meeting of The Ceramic Society of Japan
Annual Meeting of The Ceramic Society of Japan, 2008
Session ID : 2G09
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Effect of the intergranular glass composition on high temperature compressive deformation of silicon nitride
*Kenichi InabaYutaka shinodaTakashi AkatsuFumihiro Wakai
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Abstract

The effect of chemical composition of Y2O3-MgO-SiO2-based intergranular glass on high temperature deformation of alpha-Si3N4 was studied by compression tests at elevated temperatures. All spark plasma sintered Si3N4 had the same initial microstructures and the same amount of glass phase, which was different in composition only. The flow stress was not proportional to the original viscosity of Y2O3-MgO-SiO2 glass, probably, because the chemical composition of the glass changed during sintering. The difference in the chemical composition of glass altered the microstructural evolution at elevated temperatures, thus, peculiar stress-strain curves were observed in the deformation tests.

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© The Ceramic Society of Japan 2008
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