Conclusions
During the service of magnesite-chromite brick in constant temperature conditions (1700°C) and an oxidizing gaseous atmosphere in the absence of corrosive agents in the furnace space (silicates, iron oxides), fusion melts developed in the brick migrate to the colder sections, forming dense silicate-iron subzone.
The hot end of the brick is enriched with magnesia and consists of coarse grains of recrystallized periclase. The grains of chromite in these sections have a direct bond with the grains of periclase, as a result of which the thermal properties of the hot section on the whole are improved [4] despite the high porosity of the brick in the subzone.
Investigation of the structure of the pores confirms the capilliary mechanism of migration of melts. Recrystallization of periclase in the subzones adjacent to the hot zone is accompanied not by sintering and shrinkage but by coalescence (coarsening) of the pores.
Movement of the melts over the pore channels is accompanied by corrosion of the walls of the pores.
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Literature cited
I. Kneschke. Silikattechnik, Bd 15, No. 7, S. 225–227 (1964).
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B. Davies and H. Frank, J. Am. Ceram. Soc.,47, 3, 116–122 (1964).
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Translated from Ogneupory, No. 8, pp. 36–41, August, 1966.
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Strelov, K.K., Syreishchikov, Y.D. Study of magnesite-chromite brick after service in a tunnel kiln roof. Refractories 7, 460–464 (1966). https://doi.org/10.1007/BF01836516
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DOI: https://doi.org/10.1007/BF01836516