Abstract
Poor reproducibility of the transparency of corundum ceramics produced by the alkoxy technology is related to the possibility of penetration of oxidized carbon from alkoxy groups into a solid solutions with Al2O3. Carbon neutralizes the effect of magnesium oxide additive and intensifies diffusion mass transfer, capture of pores by growing crystals, and polymorphous transformation into corundum. Introduction of carbon as soot or naphthalene into previously decarbonized Al2O3 powder in the course of dry milling, its subsequent heat treatment in air or in moist CO2 medium, and sintering of the samples in vacuum supported this assumption.
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Translated from Steklo i Keramika, No. 9, pp. 18–22, September, 1999.
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Belyakov, A.V., Pershikov, S.A. & Sukhozhak, A.N. Role of carbon in production of transparent corundum ceramics using the powder alkoxy technology. Glass Ceram 56, 284–288 (1999). https://doi.org/10.1007/BF02681377
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DOI: https://doi.org/10.1007/BF02681377