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High heat flux burner-rig testing of 8YSZ thermal barrier coatings: Influence of the powder feedstock
Affiliation:1. Siemens Energy, Inc., 5101 Westinghouse Blvd.Charlotte, NC 28273, USA;2. Siemens Energy AG, Freilagerstrasse 38, 8047 Zürich, Switzerland;3. Siemens Energy, Inc., 261 Lyman Road, Casselberry, FL 32707, USA;1. Peter Grünberg Institute, PGI-7 – Electronic Materials, Forschungszentrum Jülich GmbH & Jülich Aachen Research Alliance of Fundamentals on Future Information Technology (JARA-FIT), Jülich, Germany;2. Department of Materials Engineering, National Pingtung University of Science and Technology, Pingtung, Taiwan, ROC;3. Murata Manufacturing Co., Ltd., Kyoto, Japan;4. Institute of Energy and Climate Research, IEK-1 – Materials Synthesis and Processing, Forschungszentrum Jülich GmbH, Jülich, Germany;5. Institut für Werkstoffe der Elektrotechnik II, RWTH Aachen, Aachen, Germany;1. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, India;2. Center for Thermal Spray Research, Stony Brook University, Stony Brook, NY, USA;1. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China;2. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China;3. Guangdong Academy of Science, Guangdong Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangzhou 510650, China;1. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China
Abstract:Burner-rig thermal cyclic testing of Thermal Barrier Coating (TBC) samples fabricated using different 8YSZ powders was conducted to investigate the influence of the chemical and phase compositions of the powder feedstocks. Four different powder feedstocks were selected. The chemical and phase compositions among the 8YSZ powders were systematically varied while the powder particle size and other physical characteristics were kept nominally the same. The coating process was also selected to achieve similar microstructure among the samples. The testing revealed that (1) higher impurity content (esp. silica) is detrimental to the cyclic life of the TBC; (2) coating porosity has a significant influence on the cyclic life of the TBC, the higher the porosity, the higher the cyclic life, for the range of porosity of the tested samples; (3) a low monoclinic content in the feedstock powder has not been shown to have a positive effect on the cyclic life of the TBC.
Keywords:Yttria stabilized zirconia ceramic  Chemical composition  Phase transformation  Powder feedstock  Burner rig testing  Thermal barrier coatings
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