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| Abstract No.: |
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| Title: |
Mechanical compliance in thermal barrier coatings:
Quantification and its application in coatings design and repeatability assessment
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| Authors: |
Gopal Dwivedi* / Center for Thermal Spray Research, Department of Materials Science and Engineering, Stony Brook University, USA
Sanjay Sampath / Center for Thermal Spray Research, Department of Materials Science and Engineering, Stony Brook University, USA
Toshio Nakamura/ Center for Thermal Spray Research, Department of Mechanical Engineering, Stony Brook University,
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| Abstract: |
Mechanical compliance is one of the important features of thermal barrier coatings which helps coatings withstand large strains generated at high temperatures due to thermal mismatch between coating and underneath materials. These coatings not only exhibit non-linearity but also some hysteresis, collectively called anelastic behavior, under mechanical loading depicting the extent of compliance present in them. This anelastic behavior originates from the opening/closure or sliding of a myriad array of embedded defect surfaces, and is unique for a given coating microstructure. In this study, a method to quantify the coating anelasticity as well as its correlation with other coating properties, such as thermal conductivity, will be presented. Also the applicability of the anelastic parameters in coatings design and in assessment of their repeatability will be discussed.
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