Accession Number : AD0780440

Title :   Ceramics for Gas Turbine Applications (A State-of-the-Art Survey),


Personal Author(s) : Dapkunas,S. J.

Report Date : MAY 1974

Pagination or Media Count : 37

Abstract : Silicon nitride and silicon carbide are shown to be the ceramics having the most promise, with major efforts currently under way to develop these materials for use in the near future. Mechanical properties and data on oxidation and hot corrosion have been compiled and presented for comparison with those of currently available superalloys. These comparisons show hot-pressed ceramics to have strength and environmental resistance superior to nickel- and cobalt-base superalloys at elevated temperatures but lacking in impact strength. Reaction-sintered silicon nitride is shown to be a low-strength material. Hot-pressed silicon nitride and silicon carbide are expected to find application in situations where strength and reliability rather than cost are determining factors, whereas reaction-sintered silicon nitride offers distinct advantages when low cost achieved through mass production is of great importance for lower stress applications. (Modified author abstract)

Descriptors :   *Ceramic materials, Gas turbines, Reviews, State of the art, Silicon nitrides, Silicon carbides, Hot pressing, Mechanical properties, Rupture, Thermal shock, Impact strength, Tensile properties, Stresses, Creep, Fatigue(Mechanics), Oxidation, Corrosion, Heat

Subject Categories : Ceramics, Refractories and Glass
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE