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Thermal Behavior and Mechanical Properties of Y2sio5 Environmental Barrier Coatings After Isothermal Heat Treatment

Jang, B-K; Feng, F-J; Lee, K-S; Garcia, E; Nistal, A; Nagashima, N; Kim, S; ... Kim, H-T; + view all (2016) Thermal Behavior and Mechanical Properties of Y2sio5 Environmental Barrier Coatings After Isothermal Heat Treatment. Surface and Coatings Technology , 308 pp. 24-30. 10.1016/j.surfcoat.2016.09.088. Green open access

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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.

Type: Article
Title: Thermal Behavior and Mechanical Properties of Y2sio5 Environmental Barrier Coatings After Isothermal Heat Treatment
Event: 43rd International Conference on Metallurgical Coatings and Thin Films (ICMCTF)
Location: San Diego, CA
Dates: 25 April 2016 - 29 April 2016
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.surfcoat.2016.09.088
Publisher version: https://doi.org/10.1016/j.surfcoat.2016.09.088
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Environmental barrier coatings, Y2SiO5, Isothermal heat treatment, Thermal growth oxide, Mechanical properties.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > MAPS Faculty Office > Institute for Materials Discovery
URI: https://discovery.ucl.ac.uk/id/eprint/10059414
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