Ceramic heater applied to a glow plug

摘要

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 large thickness of 30-400 µm. Thus, an impairment in joining strength induced by exposure to heat cycles and migration do not occur.