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Optimizing Nonlinear Properties of Thermal Sprayed Coatingsthrough Processing Parameters

Published online by Cambridge University Press:  26 February 2011

Yajie Liu ,
Toshio Nakamura ,
Vasudevan Srinivasan ,
Andrew Gouldstone  and
Sanjay Sampath
Yajie Liu
Affiliation:
yalliu@ic.sunysb.edu, State University of New York at Stony Brook, Mechanical Engineering, 006 Light Engineering, Department of Mechanical Engineering, Stony Brook, NY, 11790, United States
Toshio Nakamura
Affiliation:
toshio.nakamura@sunysb.edu, State University of New York, Mechanical Engineering, Stony Brook, NY, 11794, United States
Vasudevan Srinivasan
Affiliation:
vsriniva@ic.sunysb.edu, State University of New York, Materials Science and Engineering, Stony Brook, NY, 11794, United States
Andrew Gouldstone
Affiliation:
bubbleraft@gmail.com, State University of New York, Materials Science and Engineering, Stony Brook, NY, 11794, United States
Sanjay Sampath
Affiliation:
ssampath@ms.cc.sunysb.edu, State University of New York, Materials Science and Engineering, Stony Brook, NY, 11794, United States
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Abstract

Low-temperature thermal cycling of plasma sprayed zirconia coatings viacurvature measurements is used to quantify their nonlinear mechanicalbehavior. The nonlinear feature arises from the unique layered, porous andcracked morphology of thermal sprayed ceramic materials. With thisprocedure, various specimens were tested to investigate the effects ofprocessing condition. The measured nonlinear properties are interpreted inthe context of microstructural changes in the plasma sprayed coatings due todifferences in particle state upon impact and coating build-up. Theimplications of this study are significant for thermo-mechanical design ofstrain-tolerant ceramic coatings in thermal barrier applications.

Keywords

plasma depositioncoatingZr

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