Hot corrosion behaviors of SrZrO3 ceramic co-doped with Y2O3 and Yb2O3 in molten Na2SO4, V2O5, and Na2SO4 + V2O5 salts mixture

The hot corrosion behaviors of Sr(Y0.05Yb0.05Zr0.9)O-2.95 (SYYZ) ceramic were investigated in Na2SO4, V2O5, and Na2SO4 + V2O5 salts mixture, respectively. Na2SO4 did not react with SYYZ ceramic at 900, 950 and 1000 degrees C. m-ZrO2, YVO4 and YbVO4 were the main corrosion products on the SYYZ ceramic surface in V2O5 at 800 and 900 degrees C, whereas Sr3V2O8 and t-ZrO2 appeared at 1000 degrees C. In Na2SO4 + V2O5 salts mixture, the corrosion products were Sr3V2O8 and t-ZrO2 at 800 and 900 degrees C on the SYYZ ceramic surface, however, a new phase of SrZrO3 developed at 1000 degrees C. The phase transformation and chemical interaction are the primary corrosion mechanisms for degradation of SYYZ ceramic. (C) 2014 Elsevier Ltd. All rights reserved.