Patent ID: 8760044
Filing Date: 2014-06-24
Classification: B22F,C22C,H01T

Abstract:
1. A spark plug, comprising: a metallic shell having an axial bore; an insulator being at least partially disposed within the axial bore of the metallic shell, the insulator having an axial bore; a center electrode being at least partially disposed within the axial bore of the insulator; and a ground electrode being attached to the metallic shell; the center electrode, the ground electrode, or both the center and ground electrodes includes an electrode material having ruthenium (Ru), rhenium (Re), and at least one precious metal selected from the group consisting of: iridium (Ir), rhodium (Rh), platinum (Pt), palladium (Pd), or gold (Au); wherein the ruthenium (Ru) is the single largest constituent of the electrode material on a weight percentage (wt %) basis, the rhenium (Re) is present in the electrode material in an amount from about 0.1 wt % to 5 wt %, and the at least one precious metal has a smaller weight percentage than the ruthenium (Ru), and the rhenium (Re) has a smaller weight percentage than the at least one precious metal.