Water vapour corrosion of rare earth monosilicates for environmental barrier coatings application

Al Nasri, N, Patra, N, Jayaseelan, D.D. and Lee, W.E. (2017) Water vapour corrosion of rare earth monosilicates for environmental barrier coatings application. Ceramics International, 43(10), pp. 7393-7400. ISSN (print) 0272-8842

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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 microstrucre 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 coatings 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.

Item Type: Article
Research Area: Metallurgy and materials
Faculty, School or Research Centre: Faculty of Science, Engineering and Computing > School of Aerospace and Aircraft Engineering
Depositing User: Doni Daniel
Date Deposited: 02 Mar 2017 14:30
Last Modified: 12 Jul 2017 07:54
URI: http://eprints.kingston.ac.uk/id/eprint/37323

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