The synthesis of α- and β-sialon from fly-ash

R. Metselaar, D. Exalto, A.M.B. Mol, van, H.T.J.M. Hintzen

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

The paper discusses carbothermal production of both ß-sialon or Ca-a-sialon from fly-ash. The progress of the reaction was followed by XRD and electron microscopy. During the formation of ß-sialon the z-value gradually decreases to the final value. Iron impurities in the fly-ash, which catalyse the reaction have a negative influence on the mechanical strength, but can be removed afterwards by electromagnetic separation or chemical leaching. From fly-ash with a high initial calcium concentration one can prepare Ca-a-sialon at 1500 °C. Initially ß-sialon is formed, but this is rapidly converted to the a-phase.
Original languageEnglish
Title of host publicationProceedings on CD: Pacific Rim Ceramics Societies (PacRim 2)
EditorsP. Walls, C. Sorrell, A. Ruys
Place of PublicationCairns, Australia
Pages56-63
Publication statusPublished - 1999

Publication series

NameInternational Ceramic Monographs
Volume2

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