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Poly crystalline and single‐crystalline α‐alumina were reacted with a eutectic CaO‐Al 2 O 3 melt at 1530°C. A reaction zone develops in which a strongly textured CA 6 layer, as well as a CA 2 layer, forms, with a remaining layer of unreacted CaO‐AI 2 O 3 melt. Silica, an impurity in the α‐alumina, is rejected by the advancing CA 6 phase and accumulates as calcium alumino‐silicates in channels that assist in the reaction as fast transport paths. Reaction mechanisms and welding are briefly discussed.
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Jonghe et al. (1984) studied this question.
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