Mullite and mullite/ZrO₂-7wt%Y₂O₃ powders for thermal spraying of environmental barrier coatings

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DOIResolve DOI: http://doi.org/10.1007/s11666-009-9420-4
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TypeArticle
Journal titleJournal of Thermal Spray Technology
Volume19
Issue1-2
Pages286293; # of pages: 8
SubjectCrystallinity; environmental barrier coatings; flame spheroidization; mullite; plasma spray; powder feedstock; spray drying; zirconia
AbstractMullite and mullite/ZrO₂-7wt.%Y₂O₃ coatings could be thought among the main protective layers for environment barrier coatings (EBCs) to protect Si-based substrates in future gas turbine engines. Considering that feedstock of the compound powder is not commercially available, two powder processing routes Spray Drying (SD) and Flame Spheroidization (FS) were implemented for both types of powders. For each method the particle size, the morphology, and microstructure of the powder particles was determined. In addition, the effect of the heat treatment on the powder crystallinity and microstructure of FS powders was also investigated. To evaluate their suitability as feedstock materials, the powders were plasma sprayed and their in-flight particle characteristics monitored for coatings production. The powder morphology was correlated to the in-flight particle characteristics and splat morphology to gain insight about into the influence of powder characteristics on the coating formation.
Publication date
LanguageEnglish
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedNo
NRC number52414
NPARC number18398983
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Record identifier90e7ef61-ab19-4d91-adaa-db7464697207
Record created2011-08-16
Record modified2016-05-09
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