A method of making a spark plug electrode material, method of making a spark plug, and electrode segment for use in a spark plug

摘要

A method of making a spark plug electrode material, the method comprising the steps of: forming a core of a ruthenium-based material having a length dimension and a cross-sectional area oriented perpendicular to the length dimension, the ruthenium-based material comprising ruthenium (Ru arranging an intermediate layer of an iridium-based material over an outer surface of the core of ruthenium-based material, the iridium-based material iridium (Ir) being the largest placing a nickel-based cladding over an outer surface of the iridium-based interlayer to form a layered structure, the nickel-based cladding comprising nickel (Ni) as the largest single constituent having a base of wt%; hot working the layered structure to form the Que reduce sectional area of the core of ruthenium-based material to form an elongated layered wire; andremoving the nickel-based cladding from the elongate laminated wire to obtain an elongated wire of electrode material having the core of the ruthenium-based material encased in the iridium-based material.