Spark plug

Details Spark plug Spark plug

1984-05-24

1987-06-02

Moore, David K.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, H01T 1320

Patent

active

046706844

ABSTRACT:
A spark plug is disclosed having central and ground electrodes made of a nickel-base alloy and a chip made of a platinum-nickel alloy having good bonding properties to the nickel-base alloy joined to the spark discharge surface of at least one of the central and ground electrodes. In another embodiment, the chip has an intermediate layer made of the platinum-nickel alloy and a top surface layer made of platinum or a platinum-base alloy having a higher spark wear resistance than the platinum-nickel alloy. Since the chip has good bonding properties to the nickel-base alloy, peeling of the chip from the central or ground electrode does not occur, and thus the spark plug has a high durability. If a chip having intermediate and top surface layers is used, since the top surface layer exhibits a higher spark wear resistance, the resulting spark plug is of higher durability.

REFERENCES:
patent: 2326028 (1943-08-01), Griffiths
patent: 2391456 (1945-12-01), Hensel
patent: 4488081 (1984-12-01), Kondo et al.

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