Abstract
Refractories processed from corundum, magnesia-alumina spinel, periclase, and calcium and barium zirconates exhibit good resistance to the action of molten barium up to 1600°C in the absence of BaO. Corundum and spinel react with barium oxide. The barium monoaluminate forming in the process reacts with the excess BaO to give a eutectic which melts at 1480°C so that the peak service temperature of refractories based on corundum and spinel is confined to 1400–1450°C if the barium melt contains BaO. Refractories based on calcium zirconate degenerate to barium zirconate in the presence of BaO and develop spalling so that this material cannot be recommended for use under the conditions discussed here. High-density refractories processed from pure magnesia and barium zirconate are stable to the action of molten barium and barium oxide up to 1600°C and thus are the most promising materials for the purpose discussed here.
Published Version
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