Spark plug with iridium-rhodium alloy discharge portion

Details Spark plug with iridium-rhodium alloy discharge portion Spark plug with iridium-rhodium alloy discharge portion

1998-03-18

1999-12-07

Day, Michael

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313136, H01T 1339

Patent

active

059989130

ABSTRACT:
A spark plug includes a center electrode, an insulator provided outside the center electrode, a metallic shell provided outside the insulator, a ground electrode disposed opposingly to the center electrode, and a spark discharge portion fixed on at least one of the center electrode and the ground electrode for defining a spark discharge gap. The spark discharge portion is formed from an alloy containing Ir as a main component, Rh in an amount of 0.1 wt. % to 35 wt. %, and at least one of Ru and Re in an amount of 0.1 wt. % to 17 wt. %.

REFERENCES:
patent: Re35429 (1997-01-01), Kondo
patent: 4081710 (1978-03-01), Heywood et al.
patent: 4771209 (1988-09-01), Ryan
patent: 5514929 (1996-05-01), Kawamura

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