Characteristics and thermal cycling behavior of plasma-sprayed Ba(Mg1/3Ta2/3)O3 thermal barrier coatings |
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| Affiliation: | 1. Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain;2. ITMA Materials Technology, Parque Tecnológico de Asturias, 33428 Llanera, Spain;3. Centro de Investigación en Nanomateriales y Nanotecnología (CSIC-UO-PA), Parque Tecnológico de Asturias, 33428 Llanera, Spain;4. Instituto de Ciencia de los Materiales (ICMUV), Parc Científic de la Universitat de València, Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain;5. Instituto de Cerámica y Vidrio (ICV-CSIC), E-28049 Madrid, Spain;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China;2. Graduate School of University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Chemical and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China;1. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;2. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;1. Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia;2. Department of Mechanical Engineering, Faculty of Engineering, Roudehen Islamic Azad University, 189 Roudehen, Tehran 021, Iran;1. Technische Universität Bergakademie Freiberg, Freiberg, Germany;2. Institute for Applied Materials, Karlsruhe Institute of Technology, Karlsruhe, Germany |
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| Abstract: | Ba(Mg1/3Ta2/3)O3 (BMT) powders were synthesized by the solid state reaction method. BMT thermal barrier coatings (TBCs) were deposited by atmospheric plasma spraying (APS). The phase composition and microstructure of the BMT coatings were characterized. The thermal cycling behavior of the BMT coatings was investigated by the water quenching method from 1150 °C to room temperature. The results reveal that BMT powders have an ordered hexagonal perovskite structure, whereas the as-sprayed coating of BMT has a disordered cubic perovskite structure because of the different degree of structural order for different treatment conditions. During thermal cycling testing, the entire spalling of coatings occurred within the BMT coating near the bond coat. This is attributed to the following reasons: (1) the growth of a thermally grown oxides (TGO) layer, which leads to additional stresses in the coatings; (2) the coefficient of thermal expansion mismatch between the BMT coating and bond coat, which develops enormous stress in the coatings; (3) the precipitation of Ba3Ta5O15 due to the evaporation of MgO during the spraying process, which changes the continuity of the coatings. |
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| Keywords: | Perovskite structure Thermal barrier coatings Atmospheric plasma spraying Thermal cycling behavior |
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