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Air Plasma-Sprayed Y2O3 Coatings for Al2O3/Al2O3 Ceramic Matrix Composites

Mechnich, Peter and Braue, Wolfgang (2013) Air Plasma-Sprayed Y2O3 Coatings for Al2O3/Al2O3 Ceramic Matrix Composites. Journal of the European Ceramic Society (33), pp. 2645-2653. Elsevier. DOI: 10.1016/j.jeurceramsoc.2013.03.034 ISSN 0955-2219

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Abstract

Al2O3/Al2O3 ceramic matrix composites (CMC) are candidate materials for hot-gas leading components of gas turbines. Since Al2O3/Al2O3 CMC are prone to hot-corrosion in combustion environments, the development of environmental barrier coatings (EBC) is mandatory. Owing to its favorable chemical stability and thermal properties, Y2O3 is considered a candidate EBC material for Al2O3/Al2O3 CMC. Up to one mm thick Y2O3 coatings were deposited by means of air plasma spraying (APS) on Al2O3/Al2O3 CMC with a reaction-bonded Al2O3 bond-coat (RBAO). APS Y2O3 coatings exhibit a good adherence in the as-deposited state as well as upon isothermal annealing up to 1400°C. Moreover, furnace cyclic testing performed at 1200°C revealed an excellent durability. This is explained by the formation of a continuous, approximately one micron thick reaction zone at the APS Y2O3/RBAO interface. The reaction zone between Y2O3 and Al2O3 comprises three layers of thermodynamically stable yttrium-aluminates exhibiting strong bonding, respectively.

Item URL in elib:https://elib.dlr.de/85484/
Document Type:Article
Title:Air Plasma-Sprayed Y2O3 Coatings for Al2O3/Al2O3 Ceramic Matrix Composites
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, PeterWF-KSWUNSPECIFIED
Braue, WolfgangWF-KSWUNSPECIFIED
Date:2013
Journal or Publication Title:Journal of the European Ceramic Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.jeurceramsoc.2013.03.034
Page Range:pp. 2645-2653
Publisher:Elsevier
ISSN:0955-2219
Status:Published
Keywords:Ceramic Matrix Composites, Al2O3/Al2O3, Environmental Barrier Coatings, Y2O3, Air Plasma Spraying, Yttrium Aluminate
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combustion Chamber Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Keramische Strukturwerkstoffe
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:27 Nov 2013 14:15
Last Modified:31 Jul 2019 19:43

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