Spark plug for use in an internal combustion engine

Details Spark plug for use in an internal combustion engine Spark plug for use in an internal combustion engine

1994-07-20

1995-10-24

O'Shea, Sandra L.

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

123169EL, 313144, H01T 122

Patent

active

054612756

ABSTRACT:
In a spark plug having a nickel-based electrode whose front end has a firing tip made from a ruthenium- or iridium-based metal in which an oxide of a rare earth metal group is dispersed, the firing tip is welded to the electrode by a solidified alloy layer having a component of the electrode and a component of the firing tip. The firing tip contains the oxide of the rare earth metal group in a range of 5.about.15% by volume (V), and an average grain size (D) of the oxide is in a range of 0.05.about.3.0 .mu.m with a quantitative relationship as D.ltoreq.-0.34V+5.1.

REFERENCES:
patent: 4122366 (1978-10-01), Von Stutterheim et al.
patent: 5273474 (1993-12-01), Oshima et al.
patent: 5347193 (1994-09-01), Oshima et al.

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