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Journal of Materials Science
Erschienen in: Journal of Materials Science 24/2015

01.12.2015 | Original Paper

Structure, composition, and defect control during plasma spray deposition of ytterbium silicate coatings

verfasst von: Bradley T. Richards, Hengbei Zhao, Haydn N. G. Wadley

Erschienen in: Journal of Materials Science | Ausgabe 24/2015

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Abstract

Environmental barrier coatings (EBCs) are needed to protect SiC structures exposed to high temperatures in water vapor-rich environments. Recent studies of a tri-layer EBC system consisting of a silicon layer attached to the SiC, a mullite diffusion barrier and a low-steam volatility ytterbium silicate topcoat have shown some promise for use at temperatures up to 1316 °C. However, the performance of the coating system appeared to be dependent upon the manner of its deposition. Here, an air plasma spray method has been used to deposit this tri-layer EBC on α-SiC substrates, and the effects of the plasma arc current and hydrogen content upon the structure, composition, and defects in ytterbium monosilicate (Yb2SiO5) and disilicate (Yb2Si2O7) topcoats are investigated. Modification of spray parameters enabled the loss of SiO from the injected powder to be reduced, leading to partial control of coating stoichiometry and phase content. It also enabled significant control of the morphology of solidified droplets, the porosity, and the microcracking behavior within the coatings. Differences between the Yb2SiO5 and Yb2Si2O7 are discussed in the context of their EBC application.
Vorheriger Artikel The fabrication of dielectric elastomers from silicone rubber and barium titanate: employing equi-biaxial pre-stretch to achieve large deformations
Nächster Artikel Enhancement of optical transparency in Bi2O3-modified (K0.5Na0.5)0.9Sr0.1Nb0.9Ti0.1O3 ceramics for electro-optic applications

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Fußnoten
1
For Yb2SiO5, the stoichiometric Yb:Si ratio is 2 and for the Yb2Si2O7 this stoichiometric ratio is 1.
 
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Metadaten
Titel
Structure, composition, and defect control during plasma spray deposition of ytterbium silicate coatings
verfasst von
Bradley T. Richards
Hengbei Zhao
Haydn N. G. Wadley
Publikationsdatum
01.12.2015
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 24/2015
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-015-9358-5

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