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Evaluation of the Rockwell indentation test for interfacial fracture toughness measurement of Thermal Barrier Coating systems

Bartsch, Marion and Mircea, Iulian and Baufeld, Bernd and Leist, Thorsten and Yan, Jin and Karlsson, Anette M. (2006) Evaluation of the Rockwell indentation test for interfacial fracture toughness measurement of Thermal Barrier Coating systems. In: 30th annual international conference on composites, advanced ceramic materials and structures. 30th international conference on advanced ceramics and composites, [2006-01-22 - 2006-01-27], Cocoa Beach, FL, USA.

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Abstract

A critical measure of the adherence of a Thermal Barrier Coating (TBC) to the substrate is its interfacial fracture toughness. Indentation testing has been proposed by several authors as a method for estimating the interfacial fracture toughness of TBC systems: indentation perpendicular to the surface 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 systematically been performed 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. It was found that crushing and compaction of the brittle TBC, crack initiation within the TBC, and deformation of the substrate are controlling the formation of debonding cracks. The experimental results are discussed in terms of energy consumption for the observed damage processes and driving force for the evolution of debonding cracks.

Item URL in elib:https://elib.dlr.de/45991/
Document Type:Conference or Workshop Item (Speech)
Title:Evaluation of the Rockwell indentation test for interfacial fracture toughness measurement of Thermal Barrier Coating systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bartsch, MarionUNSPECIFIEDUNSPECIFIED
Mircea, IulianUNSPECIFIEDUNSPECIFIED
Baufeld, BerndKatholieke Universiteit Leuven, BelgiumUNSPECIFIED
Leist, ThorstenTechnische Universität DarmstadtUNSPECIFIED
Yan, JinUniversity of Delaware, DE, USAUNSPECIFIED
Karlsson, Anette M.University of Delaware, DE, USAUNSPECIFIED
Date:24 January 2006
Journal or Publication Title:30th annual international conference on composites, advanced ceramic materials and structures
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal Barrier Coating, Interfacial Fracture Toughness
Event Title:30th international conference on advanced ceramics and composites
Event Location:Cocoa Beach, FL, USA
Event Type:international Conference
Event Dates:[2006-01-22 - 2006-01-27]
Organizer:The American Ceramic Society
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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