| 摘要 |
[Problem] When abnormal conditions are encountered, for example, when the flow of a large current takes place immediately after the start-up of operation, due to a difference in instantaneous thermal expansion between a heat-generator and a base body, a gap may develop between them or cracks may appear in the base body. [Solution] A ceramic heater (10) is constructed by embedding a heat-generator (2) in a base body (1) made of ceramics. The heat-generator (2) has a recess (5) in a surface thereof, the ceramics being inside the recess (5). Even if a great thermal stress is developed due to a difference in thermal expansion between the heat-generator (2) and the base body (1), by the recess (5) inside which the ceramics that forms the base body (1) exists, occurrence of a gap between the heat-generator (2) and the base body (1), as well as appearance of cracks in the base body (1), can be prevented even in the direction of the length of the heat-generator (2) in which the thermal stress is applied heavily. |
