| 摘要 |
Described is an alumina-based sintered material for ceramic heater having a resistance heater (2) embedded in its ceramic material (1a, 1b). 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, SiO2, 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, calculated in terms of oxides. The material is excellent in durability and adhesion to the ceramic substrate for the resistance heater. <IMAGE> |
