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Infrared-optical properties and heat transfer coefficients of semitransparent thermal barrier coatings.

Manara, J and Arduini-Schuster, M and Rätzer-Scheibe, H.-J. and Schulz, Uwe (2009) Infrared-optical properties and heat transfer coefficients of semitransparent thermal barrier coatings. Surface and Coatings Technology, 203 (8), pp. 1059-1068. Elsevier. DOI: DOI: 10.1016/j.surfcoat.2008.09.033

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Official URL: http://www.sciencedirect.com/science/article/B6TVV-4TN0KPJ-1/2/043f18ab7c4f4f81df741e3935712da4

Abstract

Thermal barrier coatings (TBC) which are used in aircraft and land-based gas turbines for thermal insulation of thermally highly loaded components are usually semitransparent in the infrared spectral region at higher temperatures. Thus, at turbine surface conditions the total heat transfer coefficient of TBCs increases above the heat transfer coefficient caused by solid heat conduction alone. The solid thermal conductivity of electron beam physical vapor deposited (EB-PVD) partially yttria stabilized zirconia (YSZ) coatings derived from laser flash measurements were correlated with the microstructure of the coatings, which was adjusted by defined heat treatments. To obtain the contribution of the radiative transfer on the total heat transfer coefficient, infrared-optical characterizations were carried out at ambient and elevated temperatures. A theoretical model was developed which can be used to describe the heat transfer through semitransparent, absorbing and scattering media. Finally, the total heat transfer, caused by solid thermal conduction, radiative transfer and an interaction of both is derived for the coatings prepared in this work. Additionally the measurement method BBC (black body boundary conditions) which is suitable to determine spectral transmittance and emittance at elevated temperatures is introduced.

Item URL in elib:https://elib.dlr.de/57937/
Document Type:Article
Title:Infrared-optical properties and heat transfer coefficients of semitransparent thermal barrier coatings.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Manara, JZAEUNSPECIFIED
Arduini-Schuster, MZAEUNSPECIFIED
Rätzer-Scheibe, H.-J.UNSPECIFIEDUNSPECIFIED
Schulz, UweUNSPECIFIEDUNSPECIFIED
Date:2009
Journal or Publication Title:Surface and Coatings Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:203
DOI :DOI: 10.1016/j.surfcoat.2008.09.033
Page Range:pp. 1059-1068
Publisher:Elsevier
Status:Published
Keywords:EB-PVD, coating, TBC, Schutzschichten
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: Schulz, Prof. Dr Uwe
Deposited On:03 Feb 2009
Last Modified:10 Apr 2019 11:55

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