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ABSTRACT
    Oxide refractories - two types of AZTceramic and an Al2O3-rich magnesium aluminate spinel ceramic containing aluminum titanate - have been investigated.
    The AZT ceramics were prepared from a 95 wt% Al2O3 - 2.5 wt% ZrO2 - 2.5 wt% TiO2 powder mixture. The ceramics sintered at 1650 ¡ãC had a high thermal shock resistance. Their strength after quenching from 1200 ¡ãC was higher than the original strength after sintering, both after one and five quenching cycles.
    The thermal shock resistance of the Al2O3-rich spinel ceramic was improved by the addition of 12 wt% of pre-synthesized aluminum titanate. Higher strength after thermal shock in comparison with the assintered samples was not reached in this case, but compared with the pure spinel ceramic, the retained strength after repeated quenching from 950 ¡ãC or 1150 ¡ãC was higher when the ceramic contained aluminum titanate.

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