Abstract
Commercial refractory investments were examined to indicate thermal changes taking place by measuring: (1) the temperature accompanying the reaction of any change, and (2) the change in weight of the specimen. Use was made of differential thermal analysis, thermal gravimetric analysis, x-ray diffraction, and dilatometric methods. In the case of phosphate-bonded investments, particular attention was paid to both room-temperature and thermal bonding. A study was made of the decomposition of calcium sulfate in the presence of silica.
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