Development of corundum phase, crystal dimensions, degree of crystallization, specific surface, and microstructure are demonstrated, and data are shown for the practical yield of powder prepared in the course of combustion at a surface and within specimens using an SHS-method on a dry basis with application of two different fuels, i.e., citric acid and saccharose. Combustion within a specimen facilitates corundum phase development to the greatest extent independent of the fuel selected, crystal growth, and an increase in the degree of crystallization using citric acid. The greatest amount of heat of combustion released and its greater accumulation within a specimen with use of citric acid in the course of combustion facilitates development of a coarse-grained microstructure with coarser pores within the powder, and a little more specific surface (26.5 – m2/g) in contrast to powder (25.6 – m2/g) obtained in the course of combustion using saccharose, and correspondingly a greater practical yield of corundum powder.
Refractories and Industrial Ceramics – Springer Journals
Published: Dec 18, 2013
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