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A high alumina sintered body composed of a substrate consisting substantially of a2O3 and a surface layer of mullite precipitated in situ on the substrate. The sintered body is obtained by molding and sintering a composition comprising a main component containing at least 75% by weight, based on the

A high alumina sintered body composed of a substrate consisting substantially of a2O3 and a surface layer of mullite precipitated in situ on the substrate. The sintered body is obtained by molding and sintering a composition comprising a main component containing at least 75% by weight, based on the total weight of the composition, of a2O3 and a predetermined amount of silica, a mullite mineralyzing agent and B2O3. The sintered body has a combination of excellent thermal shock resistance and mechanical properties such as flexural strength.

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A high alumina sintered body composed of a substrate consisting substantially of a2O3 and a surface layer of mullite precipitated in situ on the substrate, wherein a2O3 and a glass phase are present in the mullite surface layer, said sintered body being obtained by molding and sintering at a tempera

A high alumina sintered body composed of a substrate consisting substantially of a2O3 and a surface layer of mullite precipitated in situ on the substrate, wherein a2O3 and a glass phase are present in the mullite surface layer, said sintered body being obtained by molding and sintering at a temperature at or above about 1400°C. a composition consisting essentially of 75 to 95% by weight of a2O3 and 3 to 10% by weight of SiO2 as main components, 1 to 10% by weight of a mullite mineralizing agent selected from the group consisting of TiO2, ZrO2, Fe2O3, MnO2, MoO2, Ce2O3 and mixtures thereof 0.3 to 1% by weight of B2O3, and 0.4 to 3% by weight of at least one of MgO and CaO.