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The Prospect of Y2SiO5-Based Materials as Protective Layer in Environmental Barrier Coatings

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Abstract

Bulk yttrium monosilicate (Y2SiO5) possesses interesting properties, such as low thermal expansion coefficient and stability in water vapor atmospheres, which make it a promising protective layer for SiC-based composites, intended for the hottest parts in the future gas turbines. Because protective layers are commonly applied by thermal spraying techniques, it is important to analyze the changes in structure and properties that these methods may produce in yttrium silicate coatings. In this work, two SiO2-Y2O3 compositions were flame sprayed in the form of coatings and beads. In parallel, the beads were spark plasma sintered at relatively low temperature to obtain partially amorphous bulk specimens that are used as model bulk material. The thermal aging—air and water vapor atmosphere—caused extensive nucleation of Y2SiO5 and Y2Si2O7 in both the bulk and coating. The rich water vapor condition caused the selective volatilization of SiO2 from Y2Si2O7 at the specimen surface leaving a very characteristic micro-ridged Y2SiO5 zones—either in coatings or sintered bodies. An important increase in the thermal conductivity of the aged materials was measured. The results of this work may be used as a reference body for the production of Y2SiO5 coatings using thermal spraying techniques.

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Acknowledgments

This work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under project number MAT2009-09600. Dr. E. Garcia acknowledges the financial support of the Ramon y Cajal Program of the MINECO

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Authors and Affiliations

  1. Institute of Ceramics and Glass, ICV—CSIC, Kelsen 5, 28049, Madrid, Spain

    E. García, P. Miranzo & M. I. Osendi

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  1. E. García
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  2. P. Miranzo
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  3. M. I. Osendi
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Correspondence to E. García.

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García, E., Miranzo, P. & Osendi, M.I. The Prospect of Y2SiO5-Based Materials as Protective Layer in Environmental Barrier Coatings. J Therm Spray Tech 22, 680–689 (2013). https://doi.org/10.1007/s11666-013-9917-8

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  • DOI: https://doi.org/10.1007/s11666-013-9917-8

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