Conclusions
The stability of the properties of materials made of lanthanum chromite is determined primarily by their original porosity, and to a less degree by the content of free chromium oxide. An increase in the stability of the properties may be obtained by using a material with the minimum content of free chromium oxide, and the maximum possible density.
The change in the porosity of the material on the basis of electrofused lanthanum chromite containing free chromium oxide, during use at high temperatures, is connected with the predominant removal of the chromium oxide and the completion of sintering of the material with volatilization of the Cr2O3.
The dynamics of the mass loss of lanthanum chromite depend not only on the nature of the volatilization (congruent or incongruent) but also on the material's porosity.
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V. N. Pavlikov, A. V. Shevchenko, L. M. Lopatko, and S. G. Tresvyatskii, Chemistry of High-temperature Materials; Trans. 2nd All-Union Conference on the Chemistry of Oxides at High Temperatures [in Russian], Nauka, Leningrad (Leningrad Section) (1967), pp. 52–59.
T. Sata, M. Voshimura, and K. Kuribayashi, Proc. Int. Symp. Fact. Dencif. and Sint. Oxide and Nonoxide Ceram. Hakone, Oct. 3–5, 1978, Tokyo (1979), pp. 182–189.
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Translated from Ogneupory, No. 1, pp. 26–29, January, 1989.
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Balkevich, V.L., Sotnikov, V.E., Mosin, Y.M. et al. Influence of free chromium oxide on some properties of ceramics made of lanthanum chromite. Refractories 30, 27–31 (1989). https://doi.org/10.1007/BF01292535
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DOI: https://doi.org/10.1007/BF01292535