Spark plug used for Otto engines, comprises electrodes containing spark gap and ceramic insulator having hardened surface in region of gap

摘要

A spark plug comprises electrodes (1, 2) containing a spark gap (4) and a ceramic insulator (3) having a hardened surface in the region of the gap. Preferred Features: The ceramic insulator has a carbide mixture, preferably made from titanium carbide and/or tungsten carbide in the region of the spark gap.