Conclusions
We studied refractories made from alumina bodies with a gypsum bond, made without additions of pore-forming agent, obtained by the foam method, and using sawdust. On the gas-evolution curves we noted two maxima: in the 200–400°C range, and at 1000°C.
An addition of mineralizer reduces the gas separation which is apparently explained by the better recrystallization of α-Al2O3. The refractories with the lower firing temperature separate more gases. However, introducting mineralizers may have a more decisive influence. Then, with an increase in firing temperature it is possible to note, not a growth in gas evolution, but an appreciable reduction.
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Literature cited
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Translated from Ogneupory, No. 1, pp. 51–54, January, 1971.
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Kovalev, A.I., Pechenezhskii, V.I., Pirogov, A.A. et al. Gas evolution from corundum insulating refractories heated in vacuum. Refractories 12, 58–61 (1971). https://doi.org/10.1007/BF01289856
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DOI: https://doi.org/10.1007/BF01289856