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

摘要

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 (1950and 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)