Ignition Device Electrode Composition

Inactive Publication Date: 2008-02-28
FEDERAL MOGUL WORLD WIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]This invention provides alloy compositions for alternative electrode materials that exhibit superior performance characteristics for use as the body material for spark plug center and ground electrodes. In particular, these alloys provide superior

Problems solved by technology

For example, this combination is not optimal for weldability of the tips to the electrodes, formabil

Method used

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  • Ignition Device Electrode Composition
  • Ignition Device Electrode Composition

Examples

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Embodiment Construction

[0016]Referring to FIG. 1, there is shown the working end of an ignition device in the form of a spark plug 10 that includes an outer metal shell or housing 12, an insulator 14 secured within the housing 12, a center electrode 16, a ground electrode 18, and a pair of firing tips 20, 22 located opposite each other on the center and ground electrodes 16, 18, respectively. Housing 12 can be constructed in a conventional manner and can include standard threads 24 along with an annular lower end 26 to which the ground electrode 18 is welded or otherwise attached. Similarly, all other components of the spark plug 10 (including those not shown) can be constructed using known techniques and materials, excepting of course center electrode 16, or ground electrode 18, (or both of them) that is composed of a particularly advantageous alloy composition, as will be described below. While spark plug 10 is illustrated to include firing tips 20, 22, the alloys described herein may also be used as ce...

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Abstract

An ignition device includes a ground electrode, center electrode, or both composed of a cobalt-based alloy including: Ni in an amount between about 20 and 24% by weight; Cr in an amount between about 20 and 24% by weight; W in an amount between about 10 and 16% by weight; and Co in an amount between about 32 and 47% by weight or alternately an iron-based alloy comprising: Cr in an amount between about 18 and 24% by weight; Al in an amount between about 4 and 7% by weight; and Fe in an amount between about 67 and 78% by weight. It is believed that the electrode alloys may also include Zr and B in an amount, by weight, of 0.005-0.5% Zr and 0.001-0.10% B. Center or ground electrodes of the invention may also include firing tips attached at a sparking end thereof. The firing tips may be formed of at least one of gold, a gold alloy, a platinum group metal or a tungsten alloy.

Description

RELATED APPLICATIONS[0001]This patent application claims priority to U.S. Provisional Patent Application Ser. No. 60 / 823,672, filed Aug. 28, 2006 which is hereby incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]This invention generally relates to ignition devices such as spark plugs for internal combustion engines or igniters in gas turbines and jet engines. More specifically, this invention relates such ignition devices having iron or cobalt based electrodes.RELATED ART[0003]Electrodes having noble metal firing tips are widely used in ignition devices. Platinum and iridium based alloys are the materials of choice for such firing tips, while a nickel-based alloy is usually the preferred material for the electrode bodies to which these tips are attached.[0004]Ideal characteristics for the electrode body material are high temperature corrosion resistance, good high temperature mechanical strength, good heat transfer capability, cold formability, low raw mat...

Claims

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Application Information

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IPC IPC(8): C22C19/07C22C38/18
CPCC22C38/22C22C38/32C22C38/44H01T13/39C22C38/52C22C38/54C22C38/50
Inventor LYKOWSKI, JAMES D.MCMURRAY, MARK S.
Owner FEDERAL MOGUL WORLD WIDE
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