Abstract
AbstractYb2Zr2O7 ceramic powders synthesized by chemical‐coprecipitation and calcination method were pressureless‐sintered at 1700 °C for 10 h in air to fabricate dense bulk materials. Hot corrosion studies were performed on Yb2Zr2O7 against Na2SO4 and Na2SO4 + V2O5 (molar ratio = 1:1) molten salts in a temperature range of 900–1200 °C for 8 h in air, respectively. Chemical reactions were investigated using X‐ray diffraction (XRD) and scanning electron microscopy (SEM). The Yb2Zr2O7 ceramic was severely corroded by Na2SO4 + V2O5 molten salt, however, no chemical reaction was found between individual Na2SO4 and Yb2Zr2O7. Yb2Zr2O7 reacted with Na2SO4 + V2O5 molten salt to form YbVO4 and m‐ZrO2. The thickness of hot corrosion scales formed at different temperatures was investigated to evaluate hot corrosion behavior based on fluxing mechanism. The introduction of vanadium into sulfate led to subsequent formation of NaVO3, which was acidic enough to dissolve Yb2Zr2O7 by acidic fluxing.
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