Preparation of mixtures of silicon oxynitride and silicon nitride by the reaction of calcium silicide with ammonium chloride

Authors

  • Dr. Ferdinand Hofer,

    1. Institute of Inorganic Chemistry Graz University of Technology Stremayrgasse 16, A-8010 Graz (Austria)
    Search for more papers by this author
    • Research Institute for Electron Microscopy.

  • Walter Veigl,

    1. Institute of Inorganic Chemistry Graz University of Technology Stremayrgasse 16, A-8010 Graz (Austria)
    Search for more papers by this author
  • Prof. Edwin Hengge

    Corresponding author
    1. Institute of Inorganic Chemistry Graz University of Technology Stremayrgasse 16, A-8010 Graz (Austria)
    • Institute of Inorganic Chemistry Graz University of Technology Stremayrgasse 16, A-8010 Graz (Austria)
    Search for more papers by this author

Abstract

Silicon nitride and silicon oxynitride materials have great potential for high-temperature, load-bearing applications because of their high strength, high thermal shock resistance and good oxidation resistance. The subnitride (Si3N)n formed by the known reaction of CaSi2 with ammonium halides is shown here to react with nitrogen providing a new route to, for example, silicon nitride fibers (see figure).

original image

Ancillary