Electric heating – Heating devices – Resistive element: igniter type
Patent
1985-05-30
1986-12-30
Bartis, A.
Electric heating
Heating devices
Resistive element: igniter type
123145A, 219553, 252516, 361264, H05B 312, F02P 1902
Patent
active
046330640
ABSTRACT:
A sintered ceramic heater, particularly a heater for a glow plug of a diesel engine, includes a sintered ceramic heater, which generates heat upon receiving an electric current, supported by an electrically insulating sintered ceramic body. The heater element includes a U-shaped cross-section outer portion integrally sintered with and covering a central portion. Each portion is formed of a sintered ceramic body of a mixture of electrically conductive ceramic powder having an average diameter of not more than 2 .mu.m and selected from the group consisting of MoSi.sub.2, WSi.sub.2, TiB.sub.2 and TiC, and 35-75 mol % of electrically insulating ceramic powder, e.g., Si.sub.3 N.sub.4. The central and outer portions have the same composition. However, in the central portion the average particle diameter of the conductive ceramic powder is equal to or larger than that of the insulating ceramic powder, whereas in the outer portion the average particle diameter of the conductive ceramic powder is not more than half that of the insulating ceramic powder. The specific resistance of the central portion is not less than 1.7 times as large as that of the outer portion so that the heat is generated by current flow through the outer portion of the ceramic heater.
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Atsumi Morihiro
Atumi Kinya
Ito Novuei
Yoshida Hitoshi
Bartis A.
Nippon Soken Inc.
Nippondenso Co. Ltd.
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