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Residual stresses in strongly-textured EB-PVD Thermal Barrier Coatings: X-ray Diffraction and Raman Spectroscopy Study

Zotov, Nikolay und Bartsch, Marion und Chernova, Liudmila und Schmidt, D.A. und Havenith, M. und Eggeler, Gunther (2010) Residual stresses in strongly-textured EB-PVD Thermal Barrier Coatings: X-ray Diffraction and Raman Spectroscopy Study. 8 European Conference on Residual Stresses (ECRS8), 2010-06-26 - 2010-06-28, Riva del Garda, Italy.

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Kurzfassung

Thermal barrier coatings (TBCs) are widely employed to protect the turbine blades located in the hot sections of aero engines and stationary gas turbines. Their performance and lifetime are strongly affected by the presence of residual stresses, but only limited experimental data for the state and amount of residual stresses in TBCs are available. TBCs were deposited in the present study by electron-beam physical vapour deposition (EB-PVD). The ceramic top coat (TC) of these TBCs consists of Y2O3-stabilised tetragonal ZrO2 (YSZ) and has strongly-textured columnar microstructure [1,2]. The residual stresses on the surface of our TC were investigated by X-ray diffraction (XRD) and Raman spectroscopy. For cubic materials a linear relationship between sin2() and the lattice spacings of the (hhh) and (h00) planes exists, even in the presence of non-random texture [3]. The tetragonal distortion of the YSZ phase is rather small. That is why, we have used the (220) reflection, corresponding to the (400) reflection in cubic setting, for the determination of the residual stresses by the sin2() method. Measurements were done at two different polar angles  =0o and =90o and show sin2()–splitting for <0 and >0, indicative for non-zero shear stresses. From these measurements, the main components of the stress tensor, 11, 22 and 33, as well as the shear stresses 13 and 23 were determined using a procedure based on the work of Jo and Hendricks [4], taking into account the effect of small  misalignment errors. The influence of the crystallographic texture on the accuracy of the stress tensor components is discussed. The residual stress state is tri-axial. In the as-deposited state the normal stresses 11, 22 and 33 are compressive, 13 is negative and 23 is positive. The shear stresses are attributed to the inhomogeneous microstructure and the presence of stress gradients in the surface layer of the TC. In TC samples annealed for different times at 1000oC in air, stress relaxation and development of in-plane tensile stresses is observed. The behaviour with annealing time of the average stress <> = kk, determined from the XRD measurements, is in qualitative agreement with independent Raman spectroscopy measurements. The relaxation of the residual stresses in the TC can be tentatively explained by widening of the gaps between the columns and reorientation of the grains near the TC surface, as observed by XRD texture measurements.

elib-URL des Eintrags:https://elib.dlr.de/66815/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Residual stresses in strongly-textured EB-PVD Thermal Barrier Coatings: X-ray Diffraction and Raman Spectroscopy Study
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Zotov, NikolayRuhr-Universität BochumNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bartsch, MarionNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Chernova, LiudmilaNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schmidt, D.A.Ruhr-Universität Bochum NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Havenith, M.Ruhr-Universität BochumNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Eggeler, GuntherRuhr-Universität BochumNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:26 Juni 2010
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:X-rax diffraction, thermal barrier coating, residual stress
Veranstaltungstitel:8 European Conference on Residual Stresses (ECRS8)
Veranstaltungsort:Riva del Garda, Italy
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:26 Juni 2010
Veranstaltungsende:28 Juni 2010
Veranstalter :Paolo Scardi; Department of Materials Engineering & Industrial Technologies, University of Trento (UniTN)
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Experimentelle und numerische Methoden
Hinterlegt von: Bartsch, Dr.-Ing. Marion
Hinterlegt am:30 Nov 2010 11:10
Letzte Änderung:24 Apr 2024 19:32

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