Melting temperature, emissivity, and thermal conductivity of rare-earth silicates for thermal and environmental barrier coatings

Hunter B. Schonfeld, Milena Milich, Cameron Miller, Laura Doumaux, Mackenzie Ridley, Thomas Pfeifer, William Riffe, Davide Robba, Luka Vlahovic, Konstantinos Boboridis, Rudy J.M. Konings, Adam Chamberlain, Elizabeth Opila, Patrick E. Hopkins

Research output: Contribution to journalArticlepeer-review

Abstract

In recent years, rare-earth silicates have become the industry standard for coating state-of-the-art SiC ceramic matrix composite (CMC) gas turbine engine components, due to their low volatility, high melting point, and thermal shock resistance. Current research is focused on designing rare-earth silicate based thermal-environmental barrier coatings (T/EBCs) with improved resistance to CMAS (CaO-MgO-Al2O3-SiO2), steam, and crack formation, while maintaining high temperature performance and stability. In this work we compare the high temperature performance of a variety of single and multi-component rare-earth mono- and disilicates (MS, DS) and rare earth apatites by measuring their melting points and spectrally averaged visible emissivities using laser heating and radiation pyrometry. We also report room temperature thermal conductivity measured by time-domain thermoreflectance (TDTR).

Original languageEnglish
Article number116576
JournalScripta Materialia
Volume259
DOIs
StatePublished - Apr 1 2025

Funding

We appreciate support from the Office of Naval Research, Grant Number N00014-21-1-2477 and Rolls-Royce Corporation. We are also grateful to Dr. Prasanna Balachandran and Ryan Grimes of the University of Virginia for their collaboration and insight regarding the emissivity of rare earth silicates. We appreciate support from the Office of Naval Research, Grant Number N00014-21-1-2477 and Rolls-Royce, Project Number 25-UVA-26. We are also grateful to Dr. Prasanna Balachandran and Ryan Grimes of the University of Virginia for their collaboration and insight regarding the emissivity of rare earth silicates.

Keywords

  • Environmental barrier coatings
  • Phase transition
  • Solidification
  • Thermal barrier coatings
  • Thermal conductivity

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