Sintering and some properties of mullite-corundum ceramic obtained from pure oxides

Conclusions The effect of the total concentration of SiO₂ and the method of preparation of the batch on the sintering and some of the properties of a mullite-corundum ceramic made from pure oxides has been studied.It is established that the sintering of the ceramic made from batches of various compositions containing mixtures of SiO₂ and Al₂O₃ is significantly more difficult than when analogous batches containing previously sintered mullite are used. With an increase in the concentration of Al₂O₃ in the batch with the previously synthesized mullite, the apparent density and strength increase while the open porosity decreases.The sintering of the mullite-corundum ceramic of the composition 10% SiO₂+90% Al₂O₃ containing previously sintered mullite differs from corundum and mullite by its significantly higher thermal-shock resistance.Translated from Ogneupory, No. 6, pp. 51–54, June, 1980.