Method for producing spark plug

Details Method for producing spark plug Method for producing spark plug

2006-07-25

2006-07-25

Jolley, Kirsten (Department: 1762)

Coating processes

With post-treatment of coating or coating material

Heating or drying

C427S397700, C445S007000, C313S118000

Reexamination Certificate

active

07081274

ABSTRACT:
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.

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