Abstract

The effect of Al2O3, SiO2, MgO, 3Al2O3·2SiO2 on the synthesis of LnCrO3 (where Ln=Nd, Sm, Yb) at high temperatures is considered. Chromium oxide in all the compositions Ln2O3−Cr2O3−Al2O3 (SiO2, MgO, 3Al2O3·2SiO2) reacts mostly with Ln2O3, i.e., silicon oxide alumina, magnesium oxide, and mullite do not interfere with formation of rare-earth chromates. This makes it possible to predict high durability for LnCrO3 electric heaters operating in contact with corundum, dinas, aluminosilicate, and periclase refractories in laboratory and industrial furnaces.

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