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Analysis of Anisotropic Void Sytem in Electron Beam-Physical Vapour Deposited (EB-PVD) Thermal Barrier Coatings

Ochrombel, Rene and Saruhan, Bilge and Ryukhtin, Vasyl and Wiedenmann, Albrecht (2008) Analysis of Anisotropic Void Sytem in Electron Beam-Physical Vapour Deposited (EB-PVD) Thermal Barrier Coatings. In: MaterialsScience and Engineering. Materials Science and Engineering, 2008-09-01 - 2008-09-04, Nürnberg.

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Abstract

Thermal barrier coatings (TBCs) deposited by EB-PVD protect the turbine blades situated at the high pressure sector of the aircraft and stationary turbines increasing the combustion temperature and/or diminishing the air-cooling requirements. It is an important task to uphold low thermal conductivity in TBCs during long-term service at elevated temperatures. One of the most promising methods to fulfil this task and to improve the turbine efficiency is to optimize the TBC properties by tailoring its microstructure and/or material. The different kinds of pores in EB-PVD TBCs influence their thermal conductivity according to their size, shape, orientation and volume. These pores can be open (inter-columnar and between feather arms gaps) and closed (intra-columnar pores). Since such pores are located within three-dimensionally deposited columns and enclose large differences in their sizes, shapes, distribution and anisotropy, the accessibility for their characterization becomes very complex and requires the use of sophisticated methods. This work describes the analysis of the anisotropic and nano-sized pores in PYSZ-based TBCs by means of small angle neutron scattering (SANS) method. In order to differentiate and analyse 3D closed and open pores in 400 µm thick coatings, a contrast matching SANS technique has been employed. Thermal derived changes in crystal structure as well as pore size and morphology have been correlated with thermal conductivity.

Item URL in elib:https://elib.dlr.de/56083/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of Anisotropic Void Sytem in Electron Beam-Physical Vapour Deposited (EB-PVD) Thermal Barrier Coatings
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ochrombel, ReneUNSPECIFIEDUNSPECIFIED
Saruhan, BilgeUNSPECIFIEDUNSPECIFIED
Ryukhtin, VasylTechnical University of BerlinUNSPECIFIED
Wiedenmann, AlbrechtInstitute Laue-Langevin, GrenobleUNSPECIFIED
Date:1 September 2008
Journal or Publication Title:MaterialsScience and Engineering
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:EB-PVD, PYSZ, TBC, Thermal conductivity, microstructure, SANS, Zirconoxide, Zircondioxide
Event Title:Materials Science and Engineering
Event Location:Nürnberg
Event Type:international Conference
Event Dates:2008-09-01 - 2008-09-04
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old)
DLR - Research area:Aeronautics
DLR - Program:L TT - Triebwerkstechnologien, E VG - Combustion and Gas Turbine Technologies
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: Ochrombel, Dr.rer.nat. Rene
Deposited On:21 Nov 2008
Last Modified:27 Apr 2009 15:28

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