F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
F02P 19/02 (2006.01) F23Q 7/00 (2006.01) H05B 3/14 (2006.01)
Patent
CA 2109688
An improved ceramic heater to be incorporated in a glow plug is described. The heater is made up of a ceramic core enclosed by 2 ceramic 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, is a ceramic rod which has the highest concentration of the electrically conductive substance. The core is 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. The second layer over the core contains the electrically conductive ceramic substance in a concentration which is in between that in the core and that in the insulator layer. One end of the rod is integrally connected to the second layer over it. The ceramic heater is fitted into a glow plug housing. The core and the second layer properly joined to appropriate connectors in the glow plug housing form an electrical circuit when connected to an electrical power source.
Dasgupta Sankar
Jacobs James K.
Radmacher Stephen
Sobczyk Marek
Dasgupta Sankar
Electrofuels Manufacturing Co.
Jacobs James K.
Radmacher Stephen
Rogers Law Office
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