Internal-combustion engines – Igniters – Sparkers
Reexamination Certificate
2011-01-11
2011-01-11
Gimie, Mahmoud (Department: 3747)
Internal-combustion engines
Igniters
Sparkers
C123S14650R
Reexamination Certificate
active
07866294
ABSTRACT:
An electrode for an ignition device formed from a dilute nickel alloy with improved resistance to high temperature oxidation, sulfidation, corrosive wear, deformation and fracture. The electrode includes at least 90% by weight of nickel; zirconium; boron and at least one element from the group consisting of aluminum, magnesium, silicon, chromium, titanium and manganese. The weight ratio of Zr/B may range from about 0.5 to 150, and may include amounts of, by weight of the alloy, 0.05-0.5% zirconium and 0.001-0.01% boron. The oxidation resistance may be improved by the addition of hafnium in an amount that is comparable to the amount of zirconium, which may include an amount of, by weight of the alloy, 0.005-0.2% hafnium. Electrodes of dilute nickel alloys which include aluminum and silicon, as well as those which include chromium, silicon, manganese and titanium, are particularly useful as spark plug electrodes.
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Levina Iryna
Lykowski James D.
Dickinson Wright PLLC
Federal-Mogul Worldwide, Inc.
Gimie Mahmoud
Stearns Robert L.
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