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| Abstract No.: |
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Scheduled at:
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Tuesday, September 27, 2011, Saal A 12:15 PM
Aviation Industry 1
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| Title: |
Design of thermal barrier coatings for optimal performance by finite element modeling
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| Authors: |
Mohit Gupta* / University West, Sweden
Per Nylén / Volvo Aero Corporation, Sweden
Jan Wigren/ Volvo Aero Corporation, Sweden
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| Abstract: |
The thermal and mechanical properties of Thermal Barrier Coatings (TBCs) are strongly influenced by coating defects, such as delaminations and pores, thus making it essential to have a fundamental understanding of relationships between coating microstructure and thermal conductivity and stress-strain relationship, to produce a coating that is optimized for its applications. The objective of this work was to design a thermal barrier coating which shows an improved performance in relation to its properties, thus having low thermal conductivity and low stiffness, by optimization of the coating microstructure through modelling. Finite element analysis (FEA) has recently been shown as an effective tool for evaluating thermo-mechanical material behaviour, because of this methods capability to incorporate the inherent material microstructure as an input to the model. In this work, FEA was used to predict the thermal conductivity and Youngs modulus of TBCs represented by their microstructures. The microstructures were artificially generated using a plasma-sprayed TBC like morphology generator, Tbctool. The input parameters for Tbctool were determined by using an optimization algorithm which suggested new values on the basis of the evaluated microstructure properties. These suggested values were restricted by constraints determined from a process map approach made by a design of experiments, thus relating them to the actual spray parameters. The material used for spraying the top coat was Yttria Partially Stabilized Zirconia (YPSZ). Verification of the modelling procedure was performed by comparing predicted values with corresponding measured values. The optimized coating microstructure obtained from the simulation was finally sprayed and evaluated. .
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