Spark plug and its manufacturing method

Details Spark plug and its manufacturing method Spark plug and its manufacturing method

2005-04-26

2005-04-26

Glick, Edward J. (Department: 2882)

Electric lamp and discharge devices

Spark plugs

Particular electrode structure or spacing

C445S007000, C123S1690EL

Reexamination Certificate

active

06885135

ABSTRACT:
Noble metallic tips, made of a Pt alloy or an Ir alloy, are fixed to electrode base materials. The electrode base materials are an alloy containing a chief element selected from the group consisting of Ni, Fe, and Co and a plurality of additive elements. At least two kinds of additive elements contained in this alloy have a standard free energy of formation smaller than that of the chief element.

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