| 摘要 |
<p>A ceramic heater suppressing an electric connection failure of a heating resistor by flowing current and having an excellent flowing current resistance and a glow plug having the ceramic heater. The ceramic heater (2) provided in the glow plug (1) includes an insulating ceramic base (21) and a heating resistor (22) buried in the insulating ceramic base. The heating resistor (22) contains conductive compound, silicon nitride, and granular amorphous glass phase as main contents. The oxide of rare earth elements contained in the heating resistor has a converted amount less than 2 mol % and the mol ratio R is (A/A + B) ≤ 0.3 wherein A is the mol of the converted amount of the oxide of the rare earth elements and B is the mol of the converted amount of silicon dioxide of surplus oxygen. With this composition, it is possible to suppress the electric connection failure of the heating resistor and obtain an excellent flowing current resistance.</p> |
