Author: Shayachmetov U. Dranca I.
Publisher: Springer Publishing Company
ISSN: 1388-6150
Source: Journal of Thermal Analysis and Calorimetry, Vol.64, Iss.3, 2001-06, pp. : 1153-1161
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Abstract
By thermoanalytical methods TG, DTG, DTA there have been investigated the processes occurring during the formation of ceramic materials on the basis of Al2O3, ZrO2, Si3N4, SiC, and inorganic binder. IR spectroscopy has been an additional research method. It's been determined that with the use of H3PO4 as the binder for ceramic materials, the mechanisms of thermal decomposition are connected with the following processes: 1. removal of weakly tied and crystallized water in the temperature range of 120–230°C, the removal being characterized by the endothermic effect, 2. interaction of the initial powder components of the ceramic materials with orthophosphoric acid conditioned by a strong exothermic effect on the DTA curve in the range of 230–530°C, 3. overlapping of endo- and exo-effects, testifying to a complex mechanism of thermal transformations, 4. oxidizing of the non-reacted silicon at the temperature of 720(760)°C, an increase of mass isobserved on the TG curve as a result of the formation of SiO2 — crystoballite.
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