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  • Title: [Thermal behavior of gypsum bonded investments. (Part I) Thermal behavior in heating process(author's transl)].
    Author: Tasaki Y.
    Journal: Shika Rikogaku Zasshi; 1979 Apr; 20(50):63-8. PubMed ID: 290708.
    Abstract:
    The cause of the three shrinkages in the thermal expansion curves of gypsum bonded investments, which were characterized in the previous study, was examined mainly by means of TG-DTA method, X-ray diffraction method and SEM observation. The main results were as follows: 1. The first shrinkage between 100 degrees C and 200 degrees C was caused by the dehydration of gypsum. 2. The second shrinkage between 300 degrees C and 400 degrees C was due to the transformation of soluble anhydrite to insoluble anhydrite. 3. The third shrinkage beginning at the temperature range 700 degrees C approximately 800 degrees C is considered to be related to the sintering of insoluble anhydrite.
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