Method of inserting a center electrode in a spark plug insulator

Details Method of inserting a center electrode in a spark plug insulator Method of inserting a center electrode in a spark plug insulator

1983-03-22

1985-05-28

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Spark plug or spark gap making

445 49, H01T 2102

Patent

active

045197849

ABSTRACT:
To securely seat a ceramic electrode (23, 28) in an insulator (15) of a spark plug, so that it can be sintered together with the insulator, a ceramic plug element (28) has added thereto an additive which renders the ceramic plastically deformable upon application of external energy; the additive may, for example, be a thermoplastic, which permits plastic deformation upon application of heat; or a thixotropic agent, such as glycerin, rendering the material plastically deformable when vibrated. A pellet or plug (28) is introduced into the end portion (32) of the central opening (21) of the insulator, preshaped to be slightly smaller by, for example, 0.2 mm, than the clearance opening in the insulator. The plug is then rendered plastically deformable, compressed by a plunger (34/1) acting against a counter plate (33). Either the plug or the inner surface of the bore can be coated with a conductive coating (27) including a burn-spark-resistant metal, for example platinum, which, upon compression, is not electrically interrupted. In subsequent heating steps, the additive is vaporized-off, and the plug sintered to the ceramic body which, initially, was only presintered.

REFERENCES:
patent: 3909459 (1975-09-01), Friese et al.
patent: 4406968 (1983-09-01), Friese et al.
patent: 4427915 (1984-01-01), Nishio et al.

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