Anti-fouling spark plug and method of making

摘要

A spark plug is provided. The spark plug has an insulative sleeve with a central axial bore and an exterior surface of a shaped tip portion. A coating is disposed on the exterior surface of the shaped tip portion and the coating comprises a transition metal compound or a combination of transition metal compounds, and an alkali metal compound. A center electrode extends through the central axial bore of the insulative sleeve. A metal sleeve is provided, wherein the insulating sleeve is positioned within, and secured to the metal shell. A ground electrode is coupled to the metal shell and positioned in a spaced relationship relative to the center electrode so as to define a spark gap.

主权项

1. A method comprising:
forming a first slurry solution comprising one or more transition metal compounds, the one or more transition metal compounds comprising up to 70 weight percent of the total weight of the slurry solution, wherein the one or more transition metal compounds comprise one or more late transition metals selected from the group consisting of copper, silver, gold, platinum, and palladium; applying the first slurry solution to a shaped tip portion of an insulative sleeve; forming a first coating by air drying the first slurry solution on the insulative sleeve for a first predetermined time at a first predetermined temperature; and calcining the first coating at a second predetermined temperature for a second predetermined amount of time.