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 (Unpublished)
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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/ | |||||||||||||||
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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: |
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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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