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A new direction in the creation of ceramic materials with a specified phase composition and structure. Part II. Theoretical foundations of low-temperature synthesis of SiC from gels and practical realization of this process in the technology of ceramics and refractories. 4. Mechanism of phase formation in the Al2O3 - SiC - Si - Pitch - ETS - H3BO4 system in the production of corundum refractories

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Abstract

Results of a study of the phase composition and structure of corundum-graphite materials on a combined pitch-ethylsilicate binder with an additive of B2O3 are considered. The mechanism of formation of \-SiC in mixtures based on corundum, silicon carbide, graphite, and a silicon additive with the use of the combined binder is described. The ecological problems of the use of pitch and ethyl silicate in the composition of the binder are solved by involving the products of the gel destruction and pitch coking in the reactions of low-temperature synthesis of oxygen-free compounds, β-SiC in the first place.

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Authors and Affiliations

  1. Kharkov State Polytechnical University, Kharkov, Ukraine

    G. D. Semchenko

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Translated from Ogneupory i Tekhnicheskaya Keramika, No.7, pp.10 – 18, July, 2000.

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Semchenko, G.D. A new direction in the creation of ceramic materials with a specified phase composition and structure. Part II. Theoretical foundations of low-temperature synthesis of SiC from gels and practical realization of this process in the technology of ceramics and refractories. 4. Mechanism of phase formation in the Al2O3 - SiC - Si - Pitch - ETS - H3BO4 system in the production of corundum refractories. Refract Ind Ceram 41, 220–227 (2000). https://doi.org/10.1007/BF02693753

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