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Characterization of Hot-Pressed Silicon Nitride Ceramics with Alkoxide-Derived Oxide Mixtures As the Sintering Aid

Published online by Cambridge University Press:  25 February 2011

Y. Sato ,
C. Sakurai ,
M. Ueki  and
K. Sugita
Y. Sato
Affiliation:
Advanced Mat. & Tech. Res. Lab., Nippon Steel Corp., Kawasaki 211, Japan
C. Sakurai
Affiliation:
Advanced Mat. & Tech. Res. Lab., Nippon Steel Corp., Kawasaki 211, Japan
M. Ueki
Affiliation:
Advanced Mat. & Tech. Res. Lab., Nippon Steel Corp., Kawasaki 211, Japan
K. Sugita
Affiliation:
Technical Development Bureau, Nippon Steel Corp., Futtsu 299-12, Japan
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Abstract

A homogeneous mixture of Y2O3, CeO2 and MgO with a final weight ratio of 3:1: 2 was prepared by the alkoxide method. The powder mixture was then added into Si3N4 powder in amounts ranging from 4 to 12 wt%, andconsolidated by hot-pressing. Microstructure and mechanical properties of the sintered bodies were determined and compared to those of materials prepared by the conventional route of mixing the oxide powders as sintering aids individually in essentially same composition. The β-fraction (modification ratio) in same composition was higher in thesintered bodies made through the alkoxide method than those made through the conventional one. The room temperature flexural strength was maximized with 6wt% addition of the alkoxide derived oxide, whereas, 12wt% addition of the total oxide was required to maximize the strength by conventional processing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 429
Copyright
Copyright © Materials Research Society 1993

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References

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