Abstract
The chemical and mechanical properties of plasma-spray-modified Yb2Si2O7 environmental barrier coatings were investigated after corrosion by a low silicate melt surface concentration at 1315 °C for 1 h. X-ray diffraction, simultaneuos thermal analysis, electron probe microanalysis, electron microscopy, and nanoindentation testing were used to probe coating samples. Garnet was favored to form over apatite in coatings with alumina content higher than 1–2 mol%. Garnet formation arrested corrosion through removal of the melt components. The corroded and heat-treated coatings exhibited a higher overall percentage of enhancement to the Young’s modulus and hardness results when compared to as-deposited coating samples.
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