Abstract
Calcium aluminate phases were synthesized in the range 950–1450°C from available raw materials: carbonate rock and metallurgical alumina, predominantly in the γ form with different grain sizes. The calculations of the amount of raw materials were based on the requirement to ensure the chemical composition of the product: Al2O3 71–72 and CaO 27–28 wt %. The designed phase composition of the samples is 65 wt % CaAl2O4 and 35 wt % CaAl4O7. When alumina with a grain size of 90 μm and a spherulitic microstructure is introduced into the reaction, the formation of the CaAl2O4 and CaAl4O7 phases mainly occurs in the range of 1250–1350°C, and phase equilibrium is established at 1450°C. Reducing the size of γ-alumina grains to 10 μm and destroying their spherulitic microstructure shifts the formation of calcium aluminates to the temperature range below 1250°C, and also significantly increases the rate of synthesis of target products.
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The research was carried out using the scientific equipment of the Center for Collective Use “Technologies and Materials” of the National Research University “BelSU”.
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The work was carried out at the Belgorod State National Research University (NRU “BelSU”) with the financial support of the Ministry of Science and Higher Education of the Russian Federation within the framework of agreement dated December 14, 2020, no. 075-11-2020-038 on the implementation of a comprehensive project “Creation of import-substituting production of components matrix systems and thermal engineering composite materials of a new generation based thereon” in accordance with the Decree of the Government of the Russian Federation of 04/09/2010 no. 218.
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M.A. Trubitsyn: selection of research objects, formulation of problems, analysis and processing of the results obtained, analysis of literature data; L.V. Furda: participation in setting problems, analysis of literature data; M.N. Yapryntsev: heat treatment of samples in a high-temperature furnace and studies using X-ray diffraction analysis, participation in the preparation of the section “Results and Discussion,” N.A. Volovicheva: carrying out studies of particle size distribution, analysis of the morphology of the surface of materials; M.O. Mikhailyukova: preparation of raw mixtures, analysis of the results of thermal analysis.
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Translated from Zhurnal Prikladnoi Khimii, No. 3, pp. 269–281, August, 2023 https://doi.org/10.31857/S0044461823030052
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Trubitsyn, M.A., Furda, L.V., Yapryntsev, M.N. et al. Impact of Precursor Granulometry on the Synthesis of Calcium-Aluminate Phases. Russ J Appl Chem 96, 297–309 (2023). https://doi.org/10.1134/S1070427223030059
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DOI: https://doi.org/10.1134/S1070427223030059