| 摘要 |
PROBLEM TO BE SOLVED: To provide a glow plug which is superior in the heat resistance and startability wherein the plug is a ceramic heating element used at the severe environment improving its heat resistance and thereby preventing the failure of the ceramic heating element as far as possible. SOLUTION: In the ceramic heating element 1 that is composed of a ceramic heating member 10 embedded in a ceramic substrate 13 consisting of a ceramic sintered body, an outer diameter size D of circular arcuate end face f of the ceramic substrate 13 and a wall thickness size L between the tip of the ceramic substrate 13 and the tip of exothermic member 10 is made as follows. 0.11<=L/D<=0.35 Bt this way, the ceramic heating element 1 that has a superior heat resistance and less failure of the heating member 10 due to the oxidation can be obtained. This ceramic heating element 1 becomes most suitable for a glow plug for diesel engine, and in this case, not only the failure of the ceramic heating element 1 become less, but also the startability becomes better.
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