The structure and composition of high-frequency fused mullite

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.Deceased.Translated from Ogneupory, No. 4, pp. 40–46, April, 1977.