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Effects of annealing on the microstructure and mechanical properties of EB-PVD thermal barrier coatings

Zotov, Nikolay and Bartsch, Marion and Chernova , Liudmila and Schmidt, D. A. and Havenith, M. and Eggeler, Gunther (2010) Effects of annealing on the microstructure and mechanical properties of EB-PVD thermal barrier coatings. Surface and Coatings Technology, 205, pp. 452-464. Elsevier. doi: 10.1016/j.surfcoat.2010.07.008.

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The effects of thermal annealing at 1000 °C in air on the microstructure and the mechanical properties (Young's modulus and hardness) of thermal barrier coatings consisting of a 4 mol% Y2O3 partially stabilized ZrO2 top coat and a NiCoCrAlY bond coat, deposited by electron beam physical vapour deposition on nickelbased superalloy IN 625, have been investigated using X-ray diffraction, Raman spectroscopy, scanning electron microscopy (SEM), image analysis and nanoindentation. During annealing, the ceramic top coat undergoes sintering and recrystallization. These processes lead to stress relaxation, an increase of the intracolumnar porosity and the number of large pores as measured by image analysis of SEM micrographs. An increase of the grain size of the γ-phase in the bond coat, accompanied by changes in the morphology of γ-grains with annealing time, is also observed. Correlations between these microstructural changes in the top coat and the bond coat and their mechanical properties are established and discussed.

Item URL in elib:https://elib.dlr.de/64635/
Document Type:Article
Title:Effects of annealing on the microstructure and mechanical properties of EB-PVD thermal barrier coatings
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Zotov, NikolayRuhr Universität BochumUNSPECIFIEDUNSPECIFIED
Schmidt, D. A.Ruhr Universität BochumUNSPECIFIEDUNSPECIFIED
Havenith, M.Ruhr Universität BochumUNSPECIFIEDUNSPECIFIED
Eggeler, GuntherRuhr Universität BochumUNSPECIFIEDUNSPECIFIED
Date:24 July 2010
Journal or Publication Title:Surface and Coatings Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 452-464
Keywords:Thermal barrier coatings Microstructure Annealing Nanoindentation Residual stresses Porosity
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 - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:10 Nov 2010 09:40
Last Modified:10 Apr 2019 11:55

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