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.
|Title of host publication||Proceedings on CD: Pacific Rim Ceramics Societies (PacRim 2)|
|Editors||P. Walls, C. Sorrell, A. Ruys|
|Place of Publication||Cairns, Australia|
|Publication status||Published - 1999|
|Name||International Ceramic Monographs|