Potential Materials for Gas Turbines Operating at 2200 F Blade Temperature

This paper discusses a wide variety of materials evaluated for their potential consideration as candidates for future use into gas turbine blading. Material categories include dispersion strengthened alloys, coated dispersion strengthened alloys, coated columbium based alloys, chromium cermets, coated carbon bonded-graphite cloth composites, refractory metal wire reinforced superalloys, laminated metal-ceramic composites, an intermetallic compound, and superalloys as baseline. Nine tests to assess these material properties are reported on. Conclusions indicate that coated refractory metals and coated carbon bonded-graphite cloth composites have good potential for development, refractory metal wire reinforced superalloys have fair potential for development into 2200 F turbine blading, and all other candidate materials have poor potential for development. Low strength and poor impact resistance were the major limitations of the majority of materials evaluated.