Electric heating – Heating devices – Resistive element: igniter type
Patent
1992-11-23
1994-04-19
Bartis, Anthony
Electric heating
Heating devices
Resistive element: igniter type
123145A, 219544, 219552, 219553, 252518, 252520, H05B 300, F23Q 700, F02P 1902
Patent
active
053047788
ABSTRACT:
An improved ceramic heater to be incorporated in a glow plug is described. The heater is made up of a ceramic core enclosed by two layers sintered together to form a unitary ceramic heater. All three component elements of the heater are composed of silicon nitride containing different concentrations of an electrically conductive ceramic substance, such as titanium nitride, titanium carbonitride or molybdenum disilicide. Each component additionally contains low amounts of sintering additives. The core of the heater has the highest concentration (46-75 vol. %) of the electrically conductive substance. The core enclosed in a ceramic layer which is an electrical insulator and is composed of silicon nitride, less than 28 vol. % of the electrically conductive ceramic substance and sintering additives. An outer layer over the core contains the electrically conductive ceramic substance in a concentration (33-50 vol. %) which is in between that in the core and that in the insulator layer. One end of the core is integrally connected to the outer layer over it. The ceramic heater is fitted into a glow plug housing. The core and the outer layer properly joined to appropriate connectors in the glow plug housing form an electrical circuit when connected to an electrical power source.
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Dasgupta Sankar
Jacobs James K.
Radmacher Stephen
Sobczyk Marek
Bartis Anthony
Electrofuel Manufacturing Co.
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