Directionally solidified Al2O3-ME3Al5O12 (ME: Y,Er and Yb) eutectic coatings for thermophotovoltaic systems |
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| Affiliation: | 1. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC–Universidad de Zaragoza, E50018 Zaragoza, Spain;2. Centro Universitario de la Defensa, General Military Academy, Ctra. Huesca s/n, E50090 Zaragoza, Spain;1. College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China;2. National Quality Supervision and Testing Center of Vanadium and Titanium Products, Panzhihua 617000, China;3. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions (Chengdu University of Technology), Chengdu 610059, China;1. Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China;2. Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore;3. Carle (Shanghai) Management Co., Ltd., Beijing Demonstration Center, China;1. Istanbul Technical University, Faculty of Chemical and Metallurgical Engineering, Department of Metallurgical and Materials Engineering, Particulate Materials Laboratories (PML), 34469 Maslak, Istanbul, Turkey;2. Koç University, Department of Chemistry, Rumelifeneri Yolu, 34450 Sarıyer, Istanbul, Turkey |
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| Abstract: | Selective emitters for thermophotovoltaic systems consisting of directionally solidified Al2O3-ME3Al5O12 (ME: Y, Er and Yb) eutectic coatings on Al2O3 substrates were produced and characterizated. Coatings were deposited by dip-coating on cylindrical substrates. After sintering, a continuous-wave CO2 laser was used to produce the surface resolidification. The optimization of the processing parameters yielded dense eutectic coatings with good adhesion to the substrate and with 90–200 µm in thickness. All coatings were free of voids and showed a eutectic microstructure consisting of a three dimensional interpenetrated network of Al2O3 and ME3Al5O12. The mechanical properties of the coatings (hardness and fracture toughness) were evaluated by indentation techniques. Thermal emission was studied by heating the rods with a CO2 laser at temperatures between 1000 and 1400 °C. Selective emission was observed in Er3+ and Yb3+ based coatings and attributed to the electronic transitions of the rare earth ions. Er3+-coatings showed the best emission properties as selective emitters for thermophotovoltaic converters. |
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| Keywords: | Laser remelting Eutectic coating Selective emitters Thermophotovoltaic converters |
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