Ni–YSZ cermet micro-tubes with textured surface |
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| Authors: | R Campana A Larrea JI Peña VM Orera |
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| Affiliation: | 1. Department of Chemical Engineering, Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil;2. The University of Queensland, FIMLab – Films Inorganic Membrane Laboratory, School of Chemical Engineering, Brisbane, Qld 4072, Australia;1. Department of Chemistry, Sookmyung Women’s University, Seoul 140-742, Republic of Korea;2. Department of Physics, Sogang University, Seoul 121-742, Republic of Korea;1. Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, 3 Krzhyzhanovskoho str., 03680, Kyiv, Ukraine;2. Physics and Technology Institute for Metals and Alloys, NAS, Kyiv, 34/1 Akademika Vernadskoho Blvd, 03680, Kyiv, Ukraine;1. Advanced Materials Center, Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland;2. Advanced Materials Center, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland;3. Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 10608, Taiwan, ROC;1. CEA, DEN, SRMA, F-91191 Gif-sur Yvette Cedex, France;2. LSI, CEA-CNRS-Ecole Polytechnique, F-91128 Palaiseau Cedex, France |
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| Abstract: | Tubular Ni–YSZ porous cermets, with the external surface textured in the form of submicron size alternating YSZ and porous Ni lamellae aligned perpendicular to the tube surface have been fabricated. The surface of the ceramic tubes of eutectic composition was directionally solidified in the radial direction using the laser zone melting procedure where the power of the laser was adjusted to melt a thin surface layer. The melt solidified in the very high thermal growth radial gradient produced by radiation losses and convention cooling. A crack free layer with typical eutectic lamellar microstructure, with domains aligned perpendicular to the tube surface, was produced along the external surface of the tubes. The porous cermet tubes were prepared by thermo-chemical reduction of the NiO phase in the previously textured binary NiO–YSZ eutectic precursors. After reduction, porous Ni leaves of about 100 nm lateral dimension were confined between the YSZ lamellae in the textured layer. The influence of growth parameters over microstructure size and morphology is discussed. |
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