Enhanced thermal expansion divider layers for a high efficiency, extended life spark plug

摘要

The spark plug assembly comprises a pair of electrodes, a pair of resistance welded thermal expansion divider layers affixed to the electrodes, and a pair of resistance welded firing tips affixed to the thermal expansion divider layers, such that the firing tips are coaxially aligned to form a spark gap. The thermal expansion divider layers further comprise an electrically conductive alloy comprising a combination of metals selected from the group consisting of iron, chromium, aluminum, manganese, and silicon. The thermal expansion divider layer reduces thermal stress fatigue, and eliminates the premature failure of the firing tips due to cracking, peeling and/or spalling.