Investigation of Modified Zirconia Thermal-Barrier Coatings for Gas-Turbine Applications. Summary Report, September 24, 1979-May 24, 1980

摘要

Stabilized zirconia ceramics appear to have considerable potential as thermal barriers or corrosion resistant coatings for application to gas turbine components. Salt corrosion tests have indicated however that under some conditions vanadium impurities in the fuel may cause accelerated failure of these coatings as a result of destabilization of the zirconia phase. The corrosion resistance, thermal stability and structure of the coatings depend to a large extent on the chemical composition of the ceramic phase. The results of a study of the behavior of plasma-sprayed Y sub 2 O sub 3 -Zr0 sub 2 coatings towards combustion gases and the typical salt deposits likely to be encountered in gas turbines which burn fuels containing sodium, sulfur, lead and vanadium impurities are described. (ERA citation 08:005593)