Comparison of temperature dependent deformation mechanisms of 8YSZ thermal barrier coatings prepared by air-plasma-spray and D-gun thermal spray: An in situ study |
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| Affiliation: | 1. School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA;2. Praxair Surface Technologies, Indianapolis, IN, 46222, USA;3. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA;1. Institute of Sensor and Actuator Systems, TU Wien, Gusshausstrasse, 27-29, 1040, Vienna, Austria;2. Institute of Chemical Technologies and Analytics, TU Wien, Getreidemarkt 9/164-CT, 1060, Vienna, Austria;3. University Service Centre for Transmission Electron Microscopy, TU Wien, Wiedner Hauptstrasse 8-10, 1040, Vienna, Austria;1. Universidade de São Paulo, Instituto de Física, Departamento de Física Geral, Rua do Matão, 1371 Cidade Universitária-Butantã, 05508-090 São Paulo, SP, Brazil;2. Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), C/Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain;3. Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland;4. Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland;5. Missouri University of Science and Technology, Missouri S&T, Department of Material Science & Engineering, MO 65409, USA;1. Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000, Rennes, France;2. Univ Rennes, CNRS, ISCR – UMR 6226, ScanMAT – UMS 2001, F-35000, Rennes, France;1. University of Limoges, IRCER, UMR CNRS 7315, 12 rue Atlantis, F-87068 Limoges, France;2. University of Bremen, Department of Chemistry (FB2), in vivo MR Group, Leobener Str. 7, 28359 Bremen, Germany;3. University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, IW3, 28359 Bremen, Germany |
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| Abstract: | 8 weight percent yttria stabilized zirconia (8YSZ) has gained widespread use in thermal barrier coatings for the hot sections of aero and power generation turbines due to its superb thermal and mechanical properties. In this study, in situ microcompression tests were conducted to evaluate the mechanical performance of 8YSZ coatings with dense vertically cracked (DVC) microstructures produced by detonation gun thermal spray to those deposited by air plasma spray (APS). At room temperature, the APS coatings showed high variability in fracture strength resulting from cracks and pores in the coating. DVC coatings, conversely, exhibited fracture strengths ranging from 3.9 to 6.6 GPa and less variability in fracture strength attributed to the relatively dense and less defective microstructure. At 500 °C, both coatings showed better consistency of fracture strength and enhanced deformability owing to deformable pores, ferroelastic domain switching, and dislocation activities. |
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| Keywords: | Thermal barrier coating Yttria stabilized zirconia Air plasma spray Dense vertically cracked |
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