Abstract
The present study examined the thermal properties of phosphate-bonded investments, a gypsum-bonded investment and an experimental investment powder when the basic powders were heated to high temperatures by simultaneous differential thermal analysis (DTA) and thermogravimetry (TG). The phosphate-bonded investments showed values of about 59 kcal mol−1 (247 kJ mol−1) (thermal decomposition of NH4H2PO4) and about 11 kcal mol−1 (46 kJ mol−1) (formation of NH4MgPO4). Thermal reactions occurred clearly on the DTA-TG curves for the investment powders, using powders of NH4H2PO4, and MgO with NH4H2PO4/MgO = 1 as main components in the investment.
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Wakasa, K., Yamaki, M. Thermoanalytical characteristics of powders in dental cast investment. J Mater Sci: Mater Med 3, 141–144 (1992). https://doi.org/10.1007/BF00705282
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DOI: https://doi.org/10.1007/BF00705282