74853 20190709135509.0 doi 10.1016/j.ceramint.2017.08.212 sideral 101862 ART-2017-101862 eng (orcid)0000-0003-3480-398X Oliete, Patricia B. Universidad de Zaragoza Directionally solidified Al2O3-ME3Al5O12 (ME: Y, Er and Yb) eutectic coatings for thermophotovoltaic systems 2017 Access copy available to the general public Unrestricted 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. info:eu-repo/grantAgreement/ES/MINECO/MAT2013-41045-R info:eu-repo/grantAgreement/ES/UZ/CUD2014-TEC-11 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 3.057 2017 MATERIALS SCIENCE, CERAMICS 2 / 27 = 0.074 2017 Q1 T1 0.784 2017 Ceramics and Composites 2017 Q1 Electronic, Optical and Magnetic Materials 2017 Q1 Surfaces, Coatings and Films 2017 Q1 Process Chemistry and Technology 2017 Q1 Materials Chemistry 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0003-2117-2808 López-Robledo, Manuel J. (orcid)0000-0003-2242-6822 Peña, José I. Universidad de Zaragoza Silva, Jorge 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 43, 18 (2017), 16270-16275 Ceram. int. Ceramics International 0272-8842 1153557 http://zaguan.unizar.es/record/74853/files/texto_completo.pdf Postprint 8683 http://zaguan.unizar.es/record/74853/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:74853 articulos driver 2019-07-09-11:50:29 ARTICLE