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Yttria-Fully Stabilized Zirconia Environmental Barrier Coatings for All-Oxide Ceramic Matrix Composites Fabricated by RF-Magnetron Sputtering

Mechnich, Peter and Braue, Wolfgang and Stranzenbach, Mathias and Schneider, Hartmut (2005) Yttria-Fully Stabilized Zirconia Environmental Barrier Coatings for All-Oxide Ceramic Matrix Composites Fabricated by RF-Magnetron Sputtering. 29th International Conference on Advanced Ceramics and Composites, 2005-01-23 - 2005-01-28, Cocoa Beach, FL (USA). (Unpublished)

Full text not available from this repository.

Abstract

All-oxide ceramic matrix composites are developed at DLR for various high-temperature applications, with special focus on thermal protection systems for advanced gas turbines. These alumina/mullite-based composites (“WHIPOX”, wound highly porous oxide) are inherently oxidation resistant, however high-temperature corrosion by combustion products, mainly water vapor and molten salts, must be prevented by employing additional environmental barrier coatings (EBCs). Zirconia (ZrO2) exhibits a superior stability against such high-temperature corrosion as compared to most refractory oxides. Therefore, in conjunction with its thermodynamic stability to alumina and mullite, zirconia is one of the most promising EBC materials for WHIPOX-type CMCs. Yttria-fully stabilized zirconia (Y-FSZ) coatings were deposited on WHIPOX-type CMCs by radio-frequency magnetron sputtering. As-sputtered Y-FSZ coatings are characterized by very fine-grained, narrow-standing columns which are the result of a high nucleation density in the early stages of deposition and a low deposition velocity. Upon subsequent heat-treatment, this microstructure is transformed to a homogeneous and virtually dense Y-FSZ layer. For successful deposition of thin and uniform FSZ-coatings on WHIPOX-type CMCs the application of suitable bond-coats is mandatory. Performance of magnetron-sputtered Y-FSZ EBCs in combustion environments is discussed in comparison to zirconia coatings produced by thermal spraying and electron-beam physical vapour deposition.

Item URL in elib:https://elib.dlr.de/20886/
Document Type:Conference or Workshop Item (Speech)
Title:Yttria-Fully Stabilized Zirconia Environmental Barrier Coatings for All-Oxide Ceramic Matrix Composites Fabricated by RF-Magnetron Sputtering
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, PeterUNSPECIFIEDUNSPECIFIED
Braue, WolfgangUNSPECIFIEDUNSPECIFIED
Stranzenbach, MathiasUNSPECIFIEDUNSPECIFIED
Schneider, HartmutUNSPECIFIEDUNSPECIFIED
Date:27 January 2005
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:ceramic matrix composites,zirconia,environmental barrier coatings,magnetron sputtering,
Event Title:29th International Conference on Advanced Ceramics and Composites
Event Location:Cocoa Beach, FL (USA)
Event Type:international Conference
Event Dates:2005-01-23 - 2005-01-28
Organizer:The American Ceramic Society
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:03 Jan 2006
Last Modified:27 Apr 2009 04:50

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