Accession Number : ADD018234

Title :   Negative Electron Affinity Spark Plug.

Descriptive Note : Patent, Filed 27 Jan 95, patented 27 Aug 96,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Yoder, Max N

Report Date : 27 Aug 1996

Pagination or Media Count : 8

Abstract : A spark plug having a positive electrode spark tip which is covered with a very thin layer (- or = 20 nanometers) of very hard NEA material having very large chemical binding energies such that most elements, including carbon and nitrogen, will not bind to its surface. The NEA material may be sapphire, or may be an n-type impurity-doped semiconductor material such as n-type AlN, cBN, or GaAlN having a bandgap exceeding 5.5 eV.

Descriptors :   *ELECTRODES, *SPARK PLUGS, ALUMINUM COMPOUNDS, LAYERS, CARBON, IMPURITIES, NITRIDES, NITROGEN, SURFACES, SAPPHIRE, THINNESS, DOPING, N TYPE SEMICONDUCTORS, BORON, GALLIUM COMPOUNDS, CHEMICAL ELEMENTS, PATENTS

Subject Categories : Combustion and Ignition
      Inorganic Chemistry
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE