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Abstract
Three high alumina-based, low cement castables each containing a 15% addition of andalusite of different grain size were compared to a similar castable containing micro-silica (3.7%) and no andalusite. All castables were fired at 1450 °C for 12 hours. High temperature mechanical properties of the castables were measured employing a wedge splitting test (WST). While the castable with the micro-silica addition exhibited superior strength properties, both strength and work-of-fracture values at high temperature improved in castables containing ultra fine andalusite powder. Microstructural factors leading to the observed differences in properties are discussed.
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