METALLIC INSULATOR COATING FOR HIGH CAPACITY SPARK PLUG

摘要

A spark plug is provided with an integrated capacitor feature to increase the intensity of its spark by applying metallic film to the inner and outer surfaces of a tubular insulator The insulator sustains an electrical charge when an electrical differential is established between the inner and outer metallic films The stored electrical charge is discharged with the firing of a spark in the spark gap The inner and outer metallic films can be applied as a paint or ink to the surfaces of the insulator, or can be mixed with a glazing compound to form conductive coatings Ganged or serpentine micro-plates can be formed within the inner and outer metallic films to increase the charge-carrying surface area The metallic film is specially selected from materials that will not migrate into the porous matrix of the ceramic insulator such as gold, platinum, copper, or a platinum group metal.