| 摘要 |
PURPOSE:To reduce a manufacturing cost of a ceramic glow plug by a method wherein a specified glass material is coated on the plug, baked at a specified temperature, while a ceramic heater, a metallic cap composed of stainless steel and a metallic outer cylinder are braze-bonded with copper through a glass layer. CONSTITUTION:A glass layer 13 having a ceramic and a glass material having a glass constituent with good wetting property coated and baked thereon in advance is formed at a brazed part of a ceramic heater 1 between a metallic outer cylinder 4 and a metallic cap 9, thereafter they are brazed with copper in non- oxidation atmosphere. It is preferable for a glass material to have a viscosity of 10<4>P at a value of 2.0X10<-6>/ deg.C approximating to that of a ceramic sintered material and a sintering temperature of 1,150-1,350 deg.C. In this way, it is made possible to make a substantial reduction of cost by utilizing a stainless steel material having anti-oxidation characteristic as well as a heat-resistant characteristic in the metallic outer cylinder and the metallic cap and by holding a binding force with utilization of copper brazing material at low cost. |
