Fabrication of nanostructured metallized glazes by conventional fast-firing route

Autores: Moya, J.S.|Pecharromán, C.|Montero, I.|Pina-Zapardiel, R.|Esteban-Cubillo, A.|Reinosa, J.J.|Fernandez, J.F.
Fuente: J. Am. Ceram. Soc.
94 (7), 2067-2073
2011

A metallized glaze, suitable for large-scale production, has been obtained starting from sepiolite-n(Cu, Fe) as a stable vector containing the metal-dispersed nanoparticles and following a conventional fast-firing fabrication route. A small fraction of black carbon (about 4 wtº/o) was added to the starting mixture of the glaze to avoid oxidation of Cu nanoparticles in the 500°?-700°C temperature range. At higher temperature (700°?-1190°C), a fraction of the oxygen dissolved in the glassy phase is consumed by the Fe°/Fe2 and Fe2 /Fe3 redox reaction. Based on ellipsometric and quantitative optical reflectance measurements, it has been proven that the presence of a minimum concentration of Cu nanoparticles (~10 volº/o) in the top surface glaze layer is a prerequisite to obtain an appropriate metalize glaze.