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Nanolaminated oxide ceramic coatings in the Al2O3-Y2O3 system

Eils, Nadine K. and Mechnich, Peter and Schmücker, Martin and Keune, Hartmut and Schlüter, Inga (2009) Nanolaminated oxide ceramic coatings in the Al2O3-Y2O3 system. 8th Pacific Rim Conference on Ceramic and Glass Technology, 01.-05. Juni 2009, Vancouver, Kanada.

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Abstract

Oxide ceramic coatings are of particular interest for thermal and environmental protection of engineering materials. Coatings in the Al2O3-Y2O3 system ranging from pure Al2O3 to YAlO3 were deposited by MOCVD using a screw feeding system with flash evaporation. Investigations by means of scanning and transmission electron microscopy reveal a nanolamellar microstructure. The nanolamellae result from porosity and grain size fluctuations combined in some cases with an inhomogeneity of phase formation. The nanolamellar microstructure makes the coatings highly interesting for thermal barrier coating (TBC) applications because multiple phase boundaries or grain boundaries reduce phonon scattering as well as phonon transport which may contribute to a lowering of the thermal conductivity. Annealing experiments up to 1300°C were carried out in order to prove the high temperature stability of the promising microstructure.

Item URL in elib:https://elib.dlr.de/60778/
Document Type:Conference or Workshop Item (Speech)
Title:Nanolaminated oxide ceramic coatings in the Al2O3-Y2O3 system
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Eils, Nadine K.Nadine.Eils (at) dlr.deUNSPECIFIED
Mechnich, PeterPeter.Mechnich (at) dlr.deUNSPECIFIED
Schmücker, MartinMartin.Schmuecker (at) dlr.deUNSPECIFIED
Keune, HartmutTechniche Universität Braunschweig, Inst. für OberflächentechnikUNSPECIFIED
Schlüter, IngaTechnische Universität Braunschweig, Inst. für OberflächentechnikUNSPECIFIED
Date:June 2009
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:MOCVD coating, nanolamellar microstructure, Al2O3-Y2O3 system
Event Title:8th Pacific Rim Conference on Ceramic and Glass Technology
Event Location:Vancouver, Kanada
Event Type:international Conference
Event Dates:01.-05. Juni 2009
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 - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional Ceramics
Deposited By: Eils, Dr.rer.nat. Nadine K.
Deposited On:13 Nov 2009 10:57
Last Modified:13 Nov 2009 10:57

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