Thermal behavior and mechanical properties of Y2SiO5 environmental barrier coatings after isothermal heat treatment

Byung Koog Jang, Fan Jie Feng, Kee Sung Lee, Eugenio García, Andrés Nistal, Nobuo Nagashima, Seongwon Kim, Yoon Suk Oh, Hyung Tae Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Y2SiO5 coatings are deposited by a flame-spray technique as protection layer on SiC substrates to prevent oxidation and steam corrosion. In this research, Y2SiO5 coatings were isothermally heat treated at different temperatures and different exposure times in a laboratory environment. The thermal behaviors such as phase transformation, microstructural change and thermally grown oxide (TGO) formation have been examined by XRD, SEM, and EDS analysis. Different modes of TGO growth behavior were found at different temperatures. In addition, the mechanical properties were evaluated by a Martens hardness tester. The results show that the change of microstructure and composition is not too critical, but higher temperatures and longer heating times do lead to the formation of Y2SiO5 crystalline phases and a β-Y2O3 phase. Thus, the isothermal heat treatment improves the hardness and elastic modulus of Y2SiO5 coatings.

Original languageEnglish
Pages (from-to)24-30
Number of pages7
JournalSurface and Coatings Technology
Volume308
DOIs
Publication statusPublished - Dec 25 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Thermal behavior and mechanical properties of Y<sub>2</sub>SiO<sub>5</sub> environmental barrier coatings after isothermal heat treatment'. Together they form a unique fingerprint.

  • Cite this