Conclusions
It is established that the addition of 0.1–1.0% of Bi2O3 increases 2–7 and 1.5-fold, respectively, the resistance of a material to the nucleation and spread of destructive cracks; CoO2 in amounts up to 0.1% has virtually no effect on the total thermal-shock resistance but increases threefold the resistance to the nucleation of destructive cracks.
The addition of SnO2 produces a slight decrease in both the number of heat cycles withstood before the appearance of the first visible crack and in the total thermal-shock resistance of the specimens before total destruction.
It is established that the favorable effect of the Bi2O3 additive can be reduced to the fact that it melts, forming a thin film of melt on the surface of the corundum and zircon grains; this facilitates the formation of denser structures and, after evaporation, the formation of fine discontinuous microcracks.
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Translated from Ogneupory, No. 6, pp. 39–42, June, 1981.
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Orlova, I.G., Gudilina, A.I. & Drizheruk, M.E. Effect of additives on the thermal-shock resistance of corundum-zircon refractories. Refractories 22, 344–347 (1981). https://doi.org/10.1007/BF01398002
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DOI: https://doi.org/10.1007/BF01398002