Ceramic heater
AssigneeNgk Spark Plug Co., Ltd.
InventorsMasato Taniguchi, Manabu Okinaka
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Abstract
A joint structure which does not exhibit impaired joining strength induced by exposure to heat cycles and the occurrence of migration, in a ceramic heater for a glow plug or like device. A heating element 6 is embedded in a silicon nitride ceramic substrate 5. Lead wires 15 are joined to corresponding lead wire connection terminals 11, which are connected to the heating element 6 while electrical continuity is established therebetween, by use of a brazing metal 20 which contains a predominant amount of copper. The brazing metal 20 used for joining assumes the form of a brazing metal layer having a thickness of 30-400 μm.
Claims13
A ceramic heater comprising a heating element embedded in an insulating ceramic substrate, and a lead wire joined to a lead wire connection terminal via a brazing metal which contains a predominant amount of copper, wherein electrical continuity is established between the lead wire, lead wire connection terminal and heating element.
Dependencies are inferred from the claim text.