Electric lamp and discharge devices – With temperature modifier – Spark plug type
Patent
1983-11-17
1985-09-10
Demeo, Palmer
Electric lamp and discharge devices
With temperature modifier
Spark plug type
313141, 313142, H01T 1320
Patent
active
045409102
ABSTRACT:
A spark plug for internal-combustion engines has a spark discharge gap defined between at least two electrodes opposing to each other, and a platinum-containing wear-resistant discharging layer provided on one of the electrodes. The spark plug has a thermal stress relieving layer disposed between the discharging layer and the base metal constituting the one eletrode. The thermal stress relieving layer is made of a platinum base alloy containing nickel, which constitutes the base metal. The discharging layer may be made of a material consisting essentially of 70 to 90 wt % platinum and 30 to 10 wt % iridium. The thermal stress relieving layer may be made of a material consisting essentially of 5 to 95 wt % platinum and 95 to 5 wt % nickel. Another platinum-containing wear-resistant layer may be provided on the other electrode, the wear-resistant layer being made of a material consisting essentially of 5 to 60 wt % nickel and 95 to 40 wt % platinum.
REFERENCES:
patent: 2470033 (1949-05-01), Hensel
patent: 3146370 (1964-08-01), Duyne et al.
patent: 3407326 (1968-10-01), Romine
patent: 3868530 (1975-02-01), Eaton et al.
patent: 4122366 (1978-10-01), Stutterheim et al.
patent: 4488081 (1984-12-01), Kondo et al.
Higuchi Kanji
Kondo Ryoji
Takamura Kozo
Demeo Palmer
Nippondenso Co. Ltd.
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