Abstract
A cement free high pure alumina castable composition is developed for high temperature applications using synthesized Mg-Al spinel sol as binder. The spinel sol is prepared from nitrate precursors and characterized for its pH, solid content, particle size, FTIR, thermal behavior (DSC-TG), phase formation with temperature (XRD), microstructure (FESEM), etc. High alumina castable formulations with different particle size distributions (PSDS) are conventionally processed using the synthesized sol as sole binder at two different amounts. Castables were characterized for various refractory properties after heat treatment at different temperatures. The hot strength and the corrosion resistance of the best composition are evaluated and the properties are compared with silica sol bonded high alumina castable with similar formulations, processed under similar conditions. Considerable improvement in terms of hot strength, corrosion resistance and thermal shock resistance are obtained for the spinel sol bonded composition.
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