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TBC-Adherence in Indentation Testing

Bartsch, Marion (2006) TBC-Adherence in Indentation Testing. In: Proceedings of the 1st Japanese-German Workshop on Properties and Performance of TBC-Systems, [B5]. Technische Universität Darmstadt, Institut für Werkstoffkunde. Properties and Performance of Thermal Barrier Coating Systems and Factors Affecting it, [2006-09-13 - 2006-09-15], Darmstadt, Deutschland.

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A critical measure of the adherence of a Thermal Barrier Coating (TBC) to the substrate is its interfacial fracture toughness. Indentation testing perpendicular to the surface has been proposed by several authors as a method for estimating the interfacial fracture toughness of TBC systems. Indenting the surface with a Rockwell brale C indenter generates local coating debonding, which size can be used for calculating the interfacial fracture toughness. This test has several striking advantages: it is easy to perform, small quantity of material is necessary, elaborate sample preparation is not required, and the test can be applied on components. The drawback is the difficult interpretation of the test results, which are sometimes misleading. In this study, instrumented Rockwell indentation tests have been performed systematically on TBC systems with the ceramic top coat deposited by electron beam physical vapor deposition. Specimens in “as coated” condition and after different heat treatments, which impair the interfacial fracture toughness, have been investigated. The damages induced in the TBC system during the indentation process have been analyzed by microscopic investigation of cross sections after testing with different maximum loads. After heat treatment, smaller delamination crack sizes were measured than in ‘as coated’ condition, indicating an increase of interfacial fracture toughness after heat treatment. It was found that microstructural changes during the heat treatment led to a shielding of the weakest interface in the TBC system in a way that the indentation induced crack did not reach this weakest interface.

Item URL in elib:https://elib.dlr.de/45986/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:TBC-Adherence in Indentation Testing
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:13 September 2006
Journal or Publication Title:Proceedings of the 1st Japanese-German Workshop on Properties and Performance of TBC-Systems
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:[B5]
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Technische Universität Darmstadt, Institut für Werkstoffkunde
Keywords:interfacial fracture toughness, Rockwell indentation test
Event Title:Properties and Performance of Thermal Barrier Coating Systems and Factors Affecting it
Event Location:Darmstadt, Deutschland
Event Type:international Conference
Event Dates:[2006-09-13 - 2006-09-15]
Organizer:Technische Universität Darmstadt, Institut für Werkstoffkunde
HGF - Research field:Aeronautics, Space and Transport (old)
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
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:08 Dec 2006
Last Modified:27 Apr 2009 13:18

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