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Thermal barrier coating systems — analysis of nanoindentation curves

Zotov, Nikolay and Bartsch, Marion and Eggeler, Gunther (2009) Thermal barrier coating systems — analysis of nanoindentation curves. Surface and Coatings Technology, 203, pp. 2064-2072. Elsevier. doi: 10.1016/j.surfcoat.2009.02.008.

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Mechanical properties (Young's modulus E, hardness H, degree of plasticity) of all three components of thermal barrier coatings systems, prepared by electron beam physical vapour deposition (EB PVD), have been investigated by nanoindentation. The power-law exponents n and m, describing the shapes of the loading and unloading nanoindentation curves, increase with peak load for the yttrium-stabilized zirconia top coat (TC), containing 4 mol% Y2O3, and the NiCoCrAlY bond coat (BC). The variations of m are correlated to the degree of plasticity. Decrease of the hardness with increasing peak load, generally known as indentation size effect (ISE), is observed only for the TC and the BC. The ISE in the TC is explained using a new empirical equation based on the concept of elastic recovery. The average Young's moduli of the Ni-based superalloy substrate, the BC and the TC are 189±11 GPa, 166±7 GPa, and 126±25 GPa, respectively. The corresponding average hardness values are 3.3±0.3 GPa, 5.5±0.2 GPa, and 6.2±1.7 GPa, respectively. The mechanical properties of the TC show complex behaviour upon annealing at 1000°°C in air, which can be explained by changes in the porosity and the residual stresses.

Item URL in elib:https://elib.dlr.de/61202/
Document Type:Article
Title:Thermal barrier coating systems — analysis of nanoindentation curves
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Zotov, NikolayRuhr-Universität BochumUNSPECIFIEDUNSPECIFIED
Eggeler, GuntherRuhr-Universität BochumUNSPECIFIEDUNSPECIFIED
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. 2064-2072
Keywords:Thermal barrier coatings Yttria-stabilized zirconia Ni-based superalloys Nanoindentation Indentation size effects Degree of plasticity Power-law exponents
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:27 Nov 2009 10:56
Last Modified:10 Apr 2019 11:55

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