Semiconductor body for a spark plug of a turbine engine

A semiconductor body 15 for a spark plug for a turbine engine, of cylindrical form with a conical section (32, Fig 6) to fit against the outer electrode and an upper interface portion 25 which is corrugated. The interface may comprise a rib 35, which may feature a cylindrical outer surface 36 with an axis perpendicular to the main axis (A, Fig 6), may further comprise two protuberances 37, 37', and it may be that the corrugation rises and falls around the circumference 34. The body may be made of ceramic. The body may be mounted in a sparking plug (1, Fig 3) with inner (6, Fig 3) and outer (13, Fig 3) electrodes, with a predetermined space between the outer electrode and the body. There may be an insulator (20, Fig 3) above the body, which may be attached to the body at the interface 25 with glue. A turbine engine (Fig 1) and a combustion chamber for the same (Fig 2) featuring the spark plug are claimed. The corrugation of the body prevents it from rotating when vibrated, eliminating friction erosion against the insulator, extending the lifespan of the spark plug.