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Intergranular Microstructure and Oxidation Behaviour of Si3N4 Ceramics Formed with Y2O3, Al2O3 AND ZrO2

Published online by Cambridge University Press:  25 February 2011

L.K.L. Falk ,
E.U. EngstrÖm  and
K. Rundgren
L.K.L. Falk
Affiliation:
Department of Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden
E.U. EngstrÖm
Affiliation:
Department of Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden
K. Rundgren
Affiliation:
Swedish Ceramic Institute, Box 5403, S-402 29 Göteborg, Sweden.
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Abstract

Analytical electron microscopy, X-ray diffractometry and secondary ion mass spectrometry (SIMS) have been used to characterize the intergranular microstructure of nitrided pressureless sintered (NPS) Si3N4 ceramics and the phase transformations which occur in the intergranular regions during oxidation. The phase transformations, which take place after crystallisation of the residual intergranular glass, are caused by an inward transport of oxygen and result in the development of sub-scalar phase gradients. Cubic Y2O3 stablized ZrO2 partitions from the oxynitride liquid phase sintering medium when a small amount of ZrO2(+ 3 mol% Y2O3) is added together with the Y2O3 and Al2O3 sintering additives. The latter material has a reduced oxidation resistance, presumeably due to the high oxygen conductivity of the cubic ZrO2 structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 323
Copyright
Copyright © Materials Research Society 1993

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References

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