Conclusions
We studied the properties of corundum heat-insulating refractories in relation to the alumina-containing components the type and amount of additive, and the firing temperature with the same amounts of polystyrene.
We showed the advantage of using as the bonding part of the batch finely milled unfired alumina grade G-00, and as the filler — unmilled alumina GK.
By varying the concentrations and composition of the additives, it is possible to obtain corundum lightweight refractories with densities of 0.75–1.1 g/cm3, and compressive strengths of 2–10 N/mm2. With an increase in the firing temperature the apparent density and strengths increase, and at 1780°C their values come within the range 1.0–1.35 g/cm3 and 5–25 N/mm2.
In order to reduce the after-contraction of the goods fired at 1750°C it is desirable to use Cr2O3 as additive, and to increase the strength after firing at 1780°C — MgO.
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Translated from Ogneupory, No. 9, pp. 8–11, September, 1987.
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Degtyareva, É.V., Sandutsa, T.M. & Pisareva, N.V. Influence of the type of alumina and additives on the properties of corundum heat-insulating refractory. Refractories 28, 475–478 (1987). https://doi.org/10.1007/BF01386624
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DOI: https://doi.org/10.1007/BF01386624