Accession Number : AD0883046

Title :   Development of Improved Coatings for Nickel-and Cobalt-Base Alloys.

Descriptive Note : Final technical summary rept. 1 Jun 68-31 Jul 70,

Corporate Author : TRW EQUIPMENT GROUP CLEVELAND OHIO

Personal Author(s) : Nejedlik,James F.

Report Date : DEC 1970

Pagination or Media Count : 311

Abstract : The purpose of this study was to develop and upgrade aluminum containing coating systems for the protection of nickel and cobalt alloys used in gas turbine hot section components. A comprehensive investigation of modifying elements was undertaken and correlated with hot corrosion resistance and diffusional stability under blade and vane cycle conditions (1950 amd 2200F peak temperatures, respectively). The modifying elements and combinations evaluated were Co, Mn, Cr, Ta, Fe, Mg, Si, Y, Cr-Mn, Co-Cr and Fe-Cr. The influence of the modified coatings on mechanical properties, stress-oxidation, impact and thermal shock of the superalloys was also determined. (Author)

Descriptors :   (*COATINGS, *CORROSION INHIBITION), (*NICKEL ALLOYS, COATINGS), (*COBALT ALLOYS, COATINGS), (*GAS TURBINE BLADES, PROTECTIVE TREATMENTS), DIFFUSION COATING, HEAT RESISTANT ALLOYS, HEAT RESISTANT METALS, ALUMINUM ALLOYS, IRON ALLOYS, CHROMIUM ALLOYS, MECHANICAL PROPERTIES

Subject Categories : Coatings, Colorants and Finishes
      Properties of Metals and Alloys
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE