EFFECT OF DIFFERENT NUCLEATION TEMPERATURES ON THE GRAIN MORPHOLOGY OF ALPHA-SiAlON CERAMICS

EFFECT OF DIFFERENT NUCLEATION TEMPERATURES ON THE GRAIN MORPHOLOGY OF ALPHA-SiAlON CERAMICS

Nitrogen-rich yttrium-cerium-containing multi-cation alpha-SiAlON starting compositions were prepared by gas pressure sintering using conventional alpha-Si3N4 powder. Microstructural characterisation of the two stage sintered materials showed elongated alpha-SiAlON grains in various conditions. The...

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Veröffentlicht in:Key Engineering Materials Vol.237 2001-12, Vol.237, p.169-173
Hauptverfasser: Kushan, S R, Mandal, H
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description Nitrogen-rich yttrium-cerium-containing multi-cation alpha-SiAlON starting compositions were prepared by gas pressure sintering using conventional alpha-Si3N4 powder. Microstructural characterisation of the two stage sintered materials showed elongated alpha-SiAlON grains in various conditions. The effect of different nucleation temperatures (1400, 1500 and 1600 C) and times (5 and 20 min) on the grain morphology of the alpha-SiAlON ceramics was examined. It was found that needle-like grains were formed in all circumstances. In order to control the properties by tailoring the microstructure, a fundamental understanding of the nucleation and growth of the elongated grains is necessary. 9 refs.
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