Abstract
Abstract Nanocrystalline pigments for ceramic glazes have been obtained by mechanochemical insertion of Fe and Ti in an α-Al 2 O 3 host matrix (Fe and Ti oxides were reduced by high energy milling with metallic Al with subsequent formation of additional Al 2 O 3 by oxidation of Al(0)). The powders have been characterized by X-ray diffraction, laser granulometry and by surface area and porosity measurements. Sol-gel techniques have also been used in order to obtain pigments with pure Al 2 O 3 and Cr or Fe/Ti-doped Al 2 O 3 . Pigments have been prepared using Al(III)-alkoxides or Al(III)-inorganic salts, obtaining products with different characteristics in the two cases. Pigments have been studied by X-ray diffraction, surface area and porosity measurements and by the analysis of electrochemical reactivity in aqueous suspensions. Coloring properties of pigments obtained by mechanomaking and by sol-gel techniques have been tested in ceramic glazes; their properties have also been analyzed by insertion in ceramic bodies for glazed gres (porcelain) technology.
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