Funct. Mater. 2023; 30 (4): 541-548.
Study of the influence of alumina on the modification of corundum-carbon composites
1Simon Kuznets Kharkiv National University of Economics, 9-a pr-t Nauky, 61166 Kharkiv, Ukraine
2 National Technical University "Kharkiv Polytechnic Institute", 2 Kyrpychova str., 61002 Kharkiv, Ukraine
A comprehensive study of imported alumina "Salox ALO DN-23" was carried out using the methods of infrared spectroscopy, X-ray fluorescence analysis and electron microscopy, which made it possible to obtain a number of important results. It is shown that the studied alumina contains a significant amount of β-alumina, and the presence of calcium-containing impurities in it activates low-temperature reaction sintering of the composite material with the manifestation of an antishrinkage effect, a decrease in open porosity and pore size. Such features contribute to an increase in strength, reduce gas permeability and prevent carbon oxidation, increasing the efficiency of pyrolysis. Experimental verification of the prototypes of corundum-carbon composite using the studied alumina "Salox ALO DN-23" confirmed the predicted effects.
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