Conclusions
The high-frequency smelting of a charge containing 69–75% Al2O3 and 31−25% SiO2 gives a product with a stable phase composition of mullite and glass. Corundum occurs only in the form of discrete crystals.
Mullite from a charge with alumina modulus 3.0 contains a minimum of glass and a maximum of Al2O3, so that it is the most interesting one from the standpoint of refractories production.
Firing the fused materials promotes the formation of mullite from the vitreous phase. A similar phenomenon occurs during the firing of products manufactured from fused mullite by the ceramics technology. In this case the pre-firing stage can be dispensed with.
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Deceased.
Translated from Ogneupory, No. 4, pp. 40–46, April, 1977.
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Surkova, I.A., Nikitina, N.M., Balkevich, V.L. et al. The structure and composition of high-frequency fused mullite. Refractories 18, 230–235 (1977). https://doi.org/10.1007/BF01281605
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DOI: https://doi.org/10.1007/BF01281605