Abstract
Sr(Zr1-2xCexGdx)O3-0.5x (x = 0, 0.05, 0.1 and 0.15) ceramics were prepared by pressureless sintering using powders that were synthesized by solid-state reaction. The mechanical properties and calcium–magnesium–alumino–silicate (CMAS) early corrosion behaviour of the prepared ceramics were reported. The mechanical properties of rare-earth-doped SrZrO3 improved significantly. The reaction products of the Sr(Zr1-2xCexGdx)O3-0.5x ceramics after CMAS corrosion were similar: zirconia, SrAl2O4, akermanite, and anorthite. The mechanism of CMAS corrosion resistance is summarized as follows: elemental Sr easily enters the CMAS melt, because of its high diffusivity, and promotes crystallization. Rare-earth elements can prevent melt infiltration because of their low diffusivity.
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