Electric lamp and discharge devices – Spark plugs – Particular electrode structure or spacing
Patent
1997-05-13
1999-11-02
Patel, Vip
Electric lamp and discharge devices
Spark plugs
Particular electrode structure or spacing
H01T 1320
Patent
active
059776951
ABSTRACT:
To provide a spark plug having an improved consumption resistance and producible through a simple process, a spark plug comprises a noble metal chip composed of an Ir alloy material and disposed on at least one of the tip of the center electrode and the facing portion of the ground electrode, the Ir alloy material is composed of Ir and a metal having a higher oxidation resistance than Ir and forming solid solution with Ir at all proportions to prevent oxidation evaporation of Ir, and the chip is produced by elongating an ingot of the Ir alloy material through hot forging to a bar having a fine fiber texture to prevent surface cracking during elongation, followed by hot rolling, hot wire drawing and cutting to the chip length.
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Abe Nobuo
Osamura Hironori
Denso Corporation
Gerike Matthew J.
Patel Vip
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