Modified thick thermal barrier coatings: microstructural characterization |
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| Affiliation: | 1. Tampere University of Technology, Institute of Materials Science, PO Box 589, 33101 Tampere, Finland;2. CESI, Via Reggio Emilia, 39, 20090 Segrate, Italy;3. Universita Degli Studi di Trento, Ingegneria dei Materiali, Via Mesiano 77, 38050 Trento, Italy;1. Laboratory of Mechanics, Materials and Energetic, Faculty of Technology, University of Bejaia, 06000 Bejaia, Algeria;2. Laboratory of Mechanics, Faculty of Engineering Sciences, Campus Chaabet-Ersas, University of Constantine, 25000 Constantine, Algeria;3. Mechanical Laboratory of Structure and Energetic, Mechanical Engineering Department, University of Tizi-Ouzou, 15000 Tizi-Ouzou, Algeria;4. Laboratory Processes for Materials, Energy, Water and Environment, Faculty of Science and Technology, University of Bouira, 10000 Bouira, Algeria;1. Key Lab. for New Type of Functional Materials in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, 300132, Tianjin, China;2. Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, 300130, Tianjin, China;3. School of Information Engineering, Hebei University of Technology, Tianjin, China |
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| Abstract: | Thick thermal barrier coatings were modified with laser glazing and phosphate based sealing treatments. Surface porosity of the sealed coatings decreased significantly in all cases. Structural analysis showed a strong preferred crystal orientation of the t′ZrO2 phase in direction 002] in laser-glazed 25CeO2–2.5Y2O3–ZrO2 coating. In laser-glazed 22MgO–ZrO2 coating the major phase was rhombohedral Mg2Zr5O12. In phosphate sealed 8Y2O3–ZrO2 coating the strengthening mechanism was identified as adhesive binding without chemical bonding. Coating microstructures were determined by scanning electron microscopy, energy dispersive spectroscopy, transmission electron microscopy and optical microscopy. Coatings were also characterized by X-ray diffraction, microhardness and porosity. |
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