Experimental and mathematical modelling of corrosion behaviour of CMAS coated oxide/oxide CMCs

Karthik Ramachandran, Brace Chaffey, Carmine Zuccarini, Joseph C. Bear, Doni Daniel Jayaseelan

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
56 Downloads (Pure)

Abstract

CMAS corrosion of turbine blades is a crucial failure in turbine engines and their components. In this study, oxide/oxide CMCs (AS-N610), which are candidates for gas turbine (GT) applications, are investigated for its corrosion behaviour at different temperatures and time in presence of CMAS. The corrosion studies using CMAS coating of the CMCs reveal that CMCs had a weight gain of ∼6% owing to formation of α-Al 2O 3 at 1000 °C. The SE image indicated the penetration of CMAS into the porous CMC. At 1000 °C, CMAS degraded to form a black glassy substance (Calcium alumino silicate) with traces of Mg which led to corrosion of the matrix. Indentation fracture toughness of the oxide/oxide CMCs was 7.78 ± 0.5 MPa m 0.5 which degraded by ∼12% at 1000 °C after 10 h in the presence of CMAS. A mathematical model derived through diffusion equation indicated weight gain of ∼0.3 g which was closer to experimental data.

Original languageEnglish
Pages (from-to)4213-4221
Number of pages9
JournalCeramics International
Volume49
Issue number3
Early online date26 Sept 2022
DOIs
Publication statusPublished - 1 Feb 2023
Externally publishedYes

Bibliographical note

© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).

Keywords

  • Oxide-oxide CMCs
  • Corrosion behaviour
  • CMAS
  • Fracture toughness and discussion model

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