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A TEM and SANS-Study for analysis of phase and morphology of alternative EB-PVD deposited TBC-compositions

Saruhan-Brings, Bilge and Rykhtin, V. and Kelm, Klemens (2011) A TEM and SANS-Study for analysis of phase and morphology of alternative EB-PVD deposited TBC-compositions. ICAAC 2011, 23-28. Januar 2011, Daytona, Florida, USA.

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Electron-beam physical vapor deposition (EB-PVD) of standard (PYSZ) thermal barrier coatings produces tetragonal columnar structure with anisotropic pores. Long-term stability of the ceramic top coat of TBCs can be provided through the development of new materials having ultra-low thermal conductivity, excellent phase stability and improved sintering-resistance. For this purpose two alternative TBC-compositions were produced by EB-PVD-process: Fully yttria (14 wt.%) stabilised zirconia (FYSZ) and pyrochlore (LaZr2O7) both of which yield intrinsically low thermal conductivity values. As-coated and aged samples were analysed by the Laser-Flash technique for their thermal diffusivity which were correlated with the thermal derived changes of coatings. The anisotropic nano-sized pore morphology in FYSZ- and La2Zr2O7-TBCs were analysed by small angle neutron scattering (SANS) method. Pore morphology and phase changes were investigated by advanced SANS and TEM/SEM-analysis on FIB sections, indicating that production of pyrochlore phase by EB-PVD requires some process alteration. Cubic zirconia yields anisotropic pore morphology after high temperature treatment and is present already after coating. TEM and SANS investigations indicate that the pore morphology and microstructure of EB-PVD pyrochlore and fully stabilised zirconia differ significantly from those of PYSZ.

Item URL in elib:https://elib.dlr.de/71293/
Document Type:Conference or Workshop Item (Speech)
Title:A TEM and SANS-Study for analysis of phase and morphology of alternative EB-PVD deposited TBC-compositions
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Saruhan-Brings, BilgeDLR-WFUNSPECIFIED
Rykhtin, V.Helmholtz-Zentrum BerlinUNSPECIFIED
Kelm, KlemensDLR, Institut für Werkstoff-Forschung, KölnUNSPECIFIED
Date:25 January 2011
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:EB-PVD TBC, FYSZ, Pyrochlore, TEM-, SANS-Analyse
Event Title:ICAAC 2011
Event Location:Daytona, Florida, USA
Event Type:international Conference
Event Dates:23-28. Januar 2011
Organizer:The American Ceramic Society
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 - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Saruhan-Brings, Dr. Bilge
Deposited On:20 Oct 2011 17:31
Last Modified:20 Oct 2011 17:31

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