H - Electricity – 01 – T
Patent
H - Electricity
01
T
H01T 21/02 (2006.01)
Patent
CA 2391686
A method for producing a spark plug, the spark plug comprising a center electrode, a metal shell and an alumina ceramic insulator disposed between the center electrode and the metal shell, wherein at least part of the surface of the insulator is covered with a glaze layer, the method comprising the steps of: preparing a plurality of kinds of element glaze powders wherein each kind of the element glaze powders has a different dilatometric softening point and a different linear expansion coefficient compared to other kinds of element glaze powders; coating a surface of the insulator with the plurality of kinds of element glaze powders so as to form a glaze powder layer; and baking the glaze powder layer to the surface of the insulator so as to form the glaze layer by heating the glaze powder layer.
Nishikawa Kenichi
Sugimoto Makoto
Ngk Spark Plug Co. Ltd.
Riches Mckenzie & Herbert Llp
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