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Rare-earth pyrosilicate solid-solution environmental-barrier coating ceramics for resistance against attack by molten calcia–magnesia–aluminosilicate (CMAS) glass

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Abstract

High-temperature (1500 °C) interactions of promising environmental-barrier coating (EBC) ceramics in the rare-earth (RE) pyrosilicate system, Yb(2-x)YxSi2O7 (x = 0, 0.2, 1, or 2), with three different calcia–magnesia–aluminosiliate (CMAS) glass compositions, are explored. Only the Ca/Si ratio is varied in the CMAS: 0.76, 0.44, or 0.10. Interaction between the highest Ca/Si CMAS and the EBC ceramic with the lowest x (=0, Yb2Si2O7) promotes no reaction but the formation of “blister” cracks. In contrast, the highest x (=2, Y2Si2O7) promotes the formation of an apatite reaction product, but no “blister” cracks. Observationally, it is found that a decrease in the CMAS Ca/Si ratio (0.76–0.10) and a decrease in Y-content decreases the propensity for reaction crystallization (apatite formation) and “blister” cracks. These results are rationalized based on the relative affinities between Ca2+ in the CMAS and Y3+ or Yb3+ in the EBC ceramics, suggesting a way to tune the CMAS interactions in RE pyrosilicate solid solutions.

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Acknowledgments

The support from the Office of Naval Research (Grant No. N00014-18-1-2647, monitored by Dr. D.A. Shifler) and the Department of Education (Grant No. P200A150037) GAANN fellowship (to L.R.T.) is gratefully acknowledged. We thank Ms. Mollie Koval, Mr. Qizhong Wang, Dr. Arundhati Sengupta, Dr. Hadas Sternlicht, and Dr. Hector Garces of Brown University for experimental assistance and fruitful discussions, and Dr. Rebekah Webster of the University of Virginia for performing the viscosity calculations.

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  1. School of Engineering, Brown University, Providence, Rhode Island, 02912, USA

    Laura R. Turcer & Nitin P. Padture

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  1. Laura R. Turcer
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Correspondence to Nitin P. Padture.

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Turcer, L.R., Padture, N.P. Rare-earth pyrosilicate solid-solution environmental-barrier coating ceramics for resistance against attack by molten calcia–magnesia–aluminosilicate (CMAS) glass. Journal of Materials Research 35, 2373–2384 (2020). https://doi.org/10.1557/jmr.2020.132

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