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Microwave Sintering of Si3N4 Ceramics

Published online by Cambridge University Press:  25 February 2011

Jinsong Zhang ,
Lihua Cao  and
Fei Xia
Jinsong Zhang
Affiliation:
Institute of Metal Research, Academic Sinica, Shenyang 110015, P.R., China
Lihua Cao
Affiliation:
Institute of Metal Research, Academic Sinica, Shenyang 110015, P.R., China
Fei Xia
Affiliation:
Institute of Metal Research, Academic Sinica, Shenyang 110015, P.R., China
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Abstract

The Si3N4 ceramics(91wt%Si3N4+5wt%Y2O3+4wt%Al2O3) of room temperature strength 620--760 MPa and fracture toughness 7 MPa-m½ were prepared by microwave sintering and their microstructure and mechanical properties were studied.The experiment results show that the higher N2 pressure (>4atm) is very necessary for microwave sintering of Si3N4 ceramics; microwave sintering can greatly decrease the sintering temperature to 1500* C, and increase the transformation rate of α to β-Si3N4,and reduce the total sintering time to about 1 hour. The mechanical properties of the Si3N4 ceramics sintered by microwave are better than that by conventional pressureless sintering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 269: Symposium L – Microwave Processing of Materials III , 1992 , 329
Copyright
Copyright © Materials Research Society 1992

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References

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