| 摘要 |
An alumina-based sintered material for ceramic heater having a resistance heater embedded in its ceramic material. With the total amount of Al2O3, SiO2, MgO and CaO being 100 wt %, the sintered material contains 91 to 97 wt % of Al2O3, 1 to 8 wt % of SiO2, 0.2 to 1.2 wt % of MgO and 0.2 to 1.2 wt % of CaO, the total amount of MgO and CaO being 0.4 to 1.8 wt %, whereas, for the total amount of Al2O3, MgO and CaO of 100 wt %, 0.1 to 15 wt % of (a) at least one of rare earth elements and groups IVa excluding Ti, Va and VIa of the Periodic Table are contained in the sintered material. In place of (a), 0.2 wt % or less of other elements (Na, K, Fe, Ti etc.) may also be contained in an amount not more than 0.2 wt %, calculated in terms of oxides.
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