Interaction of molten silicates with thermal barrier coatings under temperature gradients

R. Wesley Jackson, Elisa M. Zaleski, David L. Poerschke, Brian T. Hazel, Matthew R. Begley, Carlos G. Levi

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

This paper examines the effect of temperature gradients on the interaction between silicate deposits and thermal barrier coating (TBC) systems. A dedicated test facility, in which a CO2 laser is employed to impose a controllable thermal gradient through the coating and underlying substrate, is used to investigate the interaction between two silicate compositions with state-of-the-art 7YSZ EB-PVD TBCs. The experimental results are then used to guide the development of expressions that describe the nature of silicate infiltration in the TBCs, the evolution of coating elastic modulus, and the generation and release of stresses.

Original languageEnglish (US)
Pages (from-to)396-407
Number of pages12
JournalActa Materialia
Volume89
DOIs
StatePublished - May 1 2015

Bibliographical note

Funding Information:
Research supported by the Office of Naval Research under grant N00014-08-1-0522 monitored by Dr. D.A. Shifler. The modeling activity was performed through a collaboration with MRB supported by NSF-DMR 1105672. The characterization work made use of the MRL Shared Experimental Facilities, a member of the NSF-funded Materials Research Facilities Network ( www.mrfn.org ) supported by the NSF MRSEC Program under Award DMR 1121053.

Publisher Copyright:
© 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keywords

  • CMAS
  • Delamination
  • Infiltration
  • Thermal barrier coating
  • Thermal gradient

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