Spark plug having a spark discharge portion with a specific comp

Details Spark plug having a spark discharge portion with a specific comp Spark plug having a spark discharge portion with a specific comp

1998-07-29

2000-12-26

Day, Michael H.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

313142, H01T 1320

Patent

active

061664790

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 to oppose 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 0.2 to 10 wt. %, and Pt in an amount not greater than 10 wt. %. The ratio WPt/WRh of the Pt content to the Rh content falls within the range of 0.1-1.5.

REFERENCES:
patent: Re35429 (1997-01-01), Kondo
patent: 5557158 (1996-09-01), Kanao et al.
patent: 5563468 (1996-10-01), Abe et al.
patent: 5793793 (1998-08-01), Matsutani et al.
patent: 5811915 (1998-09-01), Abe et al.
patent: 5894186 (1999-04-01), Matsutani et al.
patent: 5973443 (1999-10-01), Chang et al.
patent: 5982080 (1999-11-01), Shibata et al.
patent: 5990602 (1999-11-01), Katoh et al.
patent: 5998913 (1999-12-01), Matsutani

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