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High Energy X-rays Characterizing the Material Behavior of High Temperature Thermal Barrier Coatings

Knipe, Kevin and Sofronsky, Stephen and Siddiqui, Sanna and Manero, Albert and Meid, Carla and Wischek, Janine and Okasinski, John and Almer, Jonathan and Karlsson, Anette M. and Bartsch, Marion and Raghavan, Seetha (2014) High Energy X-rays Characterizing the Material Behavior of High Temperature Thermal Barrier Coatings. 38th International Conference on Advanced Ceramics and Composites, 26.-31. Jan. 2014, Daytona, FL, USA.

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Abstract

ABSTRACT BODY: This study monitors the material behavior of Thermal Barrier Coatings (TBC) used on turbine blades. Samples tested consisted of 7-8 wt% YSZ applied by EB-PVD with a NiCrCaAlY bond coat. Monitoring of the phases in each layer and their material, mechanical and thermal characteristics under thermal gradient and mechanical loads gives insight into the behavior of these coatings at high temperature. High-energy synchrotron xrays were used to provide measurements with depth resolution through the bond coat and YSZ layers of 30 to 50 μm. X-ray diffraction patterns were taken using a 2D detector, giving accurate 360° lattice parameter measurement. The necessary information for the separation of lattice parameter changes between thermal expansion and residual mechanical strain was obtained by varying mechanical loading at high temperature. Monitoring lattice parameters such as c/a for the t’ YSZ phase gives insight into stabilizer concentration over cycling and corresponding load bearing capabilities. Additionally, these measurements give the susceptibility to phase transformations of the bond coat and its load bearing capability at high temperature under various loading conditions. Results from this study provide knowledge of how these coatings behave at high temperature and its dependence on phase and lattice parameters under variable real life thermal gradient and mechanical loads.

Item URL in elib:https://elib.dlr.de/88314/
Document Type:Conference or Workshop Item (Speech)
Title:High Energy X-rays Characterizing the Material Behavior of High Temperature Thermal Barrier Coatings
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knipe, KevinUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Sofronsky, StephenUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Siddiqui, SannaUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Manero, AlbertUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Meid, Carlacarla.meid (at) dlr.deUNSPECIFIED
Wischek, Janinejanine.wischek (at) dlr.deUNSPECIFIED
Okasinski, JohnAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Almer, JonathanAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Karlsson, Anette M.Cleveland State University, Ohio, USAUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Raghavan, SeethaUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Date:28 January 2014
Refereed publication:No
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Synchrotron, Thermal Barrier Coatings, high temperature
Event Title:38th International Conference on Advanced Ceramics and Composites
Event Location:Daytona, FL, USA
Event Type:international Conference
Event Dates:26.-31. Jan. 2014
Organizer:American Ceramic Society
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:24 Feb 2014 07:34
Last Modified:24 Feb 2014 07:34

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