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| Abstract No.: |
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Scheduled at:
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Tuesday, May 04, 2010, Sophia Room 2:45 PM
Young Scientists
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| Title: |
Changes observed in anelastic behavior of plasma sprayed YSZ coatings by modifying the defect surfaces
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| Authors: |
Gopal Dwivedi* / Center for Thermal Spray Research, Department of Materials Science and Engineering, Stony Brook University, USA
Alfredo Valarezo / Center for Thermal Spray Research, Stony Brook University, USA
Sanjay Sampath/ Center for Thermal Spray Research, Stony Brook University, USA
Toshio Nakamura/ Center for Thermal Spray Research, Stony Brook University, USA
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| Abstract: |
Plasma sprayed ceramic coatings show non-linear and hysteretic stress-strain behavior under thermal loading; collectively, this is referred to as anelastic behavior of the coating. The defects (cracks, pores, interfaces etc.) present in the coating are responsible for such unique behavior . Density, sizes and distributions of the defects govern the extent of anelasticity present in the coating. As a load is applied to a coating, these defects undergo geometrical change (crack face sliding, pores or cracks opening or closing etc.). Crack face sliding which has a large influence on hysteretic behavior of coating depends on the surface associated with the cracks, and by modifying the properties of defect surfaces, the anelasticity can be altered. In this study, some preliminary results will be discussed on the change in anelasticity observed in an air plasma sprayed YSZ coated Aluminum specimen after exposing it to two different media (oil and water) for different time periods. The anelasticity change in the coating will be characterized based on its curvature-temperature response during the thermal cycling.
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