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YSZ Environmental Barrier Coatings for Oxide/Oxide Ceramic Matrix Composites

Mechnich, Peter and Braue, Wolfgang (2010) YSZ Environmental Barrier Coatings for Oxide/Oxide Ceramic Matrix Composites. 7th International Conference on High Temperature Ceramic Matrix Composites (HT-CMC 7), 20.-22. September 2010, Bayreuth, Deutschland.

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Abstract

Oxide/oxide ceramic matrix composites (CMCs) are considered key high-temperature materials for combustor liners, vanes or shrouds of next generation gas turbines. State-of-the-art oxide/oxide CMCs are prone to high-temperature recession in combustion environments caused by hydroxylation and subsequent volatilization of the constituents alumina and mullite. Therefore, CMC protection by suitable environmental barrier coatings (EBCs) is mandatory. Development and performance assessment of EBCs for oxide/oxide CMCs are focused topics at DLR since many years. EBC materials must exhibit superior corrosion stability with respect to alumina and mullite. But also compatibility between EBC and CMC substrate is mandatory. Among candidate EBC materials, yttria stabilized zirconia (YSZ) offers high corrosion resistance and adequate compatibility to alumina and mullite. YSZ-EBCs have been deposited on alumina/alumina CMCs by a variety of processes including electron beam physical vapor deposition (EB-PVD), air plasma spraying (APS) and metal-organic chemical vapor deposition (MOCVD). The different manufacturing processes for YSZ-EBCs are reviewed with regard to microstructure and microstructural stability. A common problem of YSZ coatings is their susceptibility against high-temperature corrosion induced by airborne inorganic particles, commonly referred as CMAS-type corrosion. CMAS-type corrosion of YSZ-coated oxide/oxide CMCs is discussed with respect to turbine target applications.

Item URL in elib:https://elib.dlr.de/66307/
Document Type:Conference or Workshop Item (Speech)
Title:YSZ Environmental Barrier Coatings for Oxide/Oxide Ceramic Matrix Composites
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, Peterpeter.mechnich (at) dlr.deUNSPECIFIED
Braue, Wolfgangwolfgang.braue (at) dlr.deUNSPECIFIED
Date:2010
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:Environmetal Barrier Coating, Yttria-stabilzed Zirconia, CMC, CMAS corrosion
Event Title:7th International Conference on High Temperature Ceramic Matrix Composites (HT-CMC 7)
Event Location:Bayreuth, Deutschland
Event Type:international Conference
Event Dates:20.-22. September 2010
HGF - Research field:Aeronautics, Space and Transport (old)
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 > Structural and Functional Ceramics
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:19 Nov 2010 12:08
Last Modified:19 Nov 2010 12:08

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