Water vapour corrosion of rare earth monosilicates for environmental barrier coatings application
File(s)
Accepted version
Author(s)
Al Nasiri, N
Patra, N
Jayaseelan, D
Lee, W
Type
Journal Article
Abstract
Water vapour corrosion resistance of five rare earth monosilicates Y2SiO5, Gd2SiO5, Er2SiO5, Yb2SiO5, and Lu2SiO5 was investigated during testing at 1350 °C for up to 166 h in static air with 90% water vapour. Four of the RE-silicates showed little weight gain (0.859 mg cm−2) after 166 h of exposure. Prior to testing the microstructure consists of equiaxed grains of 4- 7±0.4 µm. XRD analysis showed that after 50 h exposure to water vapour corrosion Y, Er, Yb and Lu-silicates had both mono and disilicates present on their surfaces as a result of the reaction between monosilicate and water vapour to form disilicate, while Gd-silicate has converted completely to G4.67Si3O13 making it less stable for environmental barrier coating application. The microstructures of corroded Y, Er, Yb and Lu-silicates contain ridges and cracks, while that of Gd-silicate contains rounded grains suggesting melting along with striped contract grains.
Date Issued
2017-03-01
Date Acceptance
2017-02-23
Citation
Ceramics International, 2017, 43 (10), pp.7393-7400
ISSN
1873-3956
Publisher
Elsevier
Start Page
7393
End Page
7400
Journal / Book Title
Ceramics International
Volume
43
Issue
10
Copyright Statement
© 2017 Elsevier Ltd and Techna Group S.r.l. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Rolls-Royce Plc
Grant Number
5002532744 - SES:1001619426
Subjects
Science & Technology
Technology
Materials Science, Ceramics
Materials Science
are earth monosilicates
nvironmental barrier coating
Water vapour resistance
CERAMIC-MATRIX COMPOSITES
SILICON-NITRIDE
EBC
DISILICATES
BEHAVIOR
03 Chemical Sciences
09 Engineering
19 Studies In Creative Arts And Writing
Materials
Publication Status
Published