Spark plug with igniting portion chip composition

Details Spark plug with igniting portion chip composition Spark plug with igniting portion chip composition

1997-06-27

1999-04-13

O'Shea, Sandra

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

123169EL, H01T 1320

Patent

active

058941860

ABSTRACT:
A spark plug includes a central electrode, an insulator exterior to the central electrode, a metallic shell exterior to the insulator and having the central electrode protrude from one end of the metallic shell, a ground electrode having one end coupled to the metallic shell and having another end facing the central electrode, and an igniting portion secured to either the central electrode or to the ground electrode or to both for forming a spark discharge gap, wherein the igniting portion comprises a chip including a metal-oxide composite material including at least 10 wt % of Ir, an alloy having at least one element selected from a group consisting of Rh, Mo, Nb and Pt in a total amount in a range of 0.5 to 88.4 wt %, and a rare earth oxide in an amount ranging from 1.6 to 15 wt %.

REFERENCES:
patent: 5461275 (1995-10-01), Oshima
patent: 5461276 (1995-10-01), Matsutani et al.

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