Patent ID: 9004969
Filing Date: 2015-04-14
Classification: H01T

Abstract:
1. A method of making a spark plug electrode, comprising the steps of: a. providing an inner core of a ruthenium (Ru) based alloy or an iridium (Ir) based alloy; b. providing an outer skin over at least a portion of said inner core to produce a core and skin assembly, said outer skin having platinum (Pt), gold (Au), silver (Ag), or nickel (Ni), or having an alloy of Pt, an alloy of Au, an alloy of Ag, or an alloy of Ni; c. after said outer skin has been provided over said at least a portion of said inner core, increasing the temperature of said core and skin assembly to a temperature greater than 1,000° C.; and d. hot forming said core and skin assembly at the increased temperature into an elongated wire, wherein both of said inner core and said outer skin are elongated during the hot forming process.