The work focuses on the syntheses of red inorganic ceramic pigments by inclusion of hematite in a fumed silica matrix. Leaching tests in boiling solutions of concentrated (36 wt%) hydrochloric acid demonstrated that, starting from mixtures of fumed silica and synthetic goethite, the occlusion of hematite occurs by calcination at 1150-1200 degrees C for 2-4 h. Better results were obtained by using fumed silica having surface area ranging from 300 to 400 m(2)/g. A continuos change in colour was measured by comparing L-a-b values of the calcined samples and more information were obtained by the Kubelka-Munk absorption function. Because its chemical and thermal stability, the obtained heteromorphic pigment may be considered a suitable red pigment for ceramic manufacturing by fast firing cycles.

Syntheses of Fe2O3/silica red inorganic inclusion pigments for ceramic applications / Bondioli, Federica; A. M., Ferrari; C., Leonelli; T., Manfredini. - In: MATERIALS RESEARCH BULLETIN. - ISSN 0025-5408. - 33 (5):(1998), pp. 723-729.

Syntheses of Fe2O3/silica red inorganic inclusion pigments for ceramic applications

BONDIOLI, Federica;
1998-01-01

Abstract

The work focuses on the syntheses of red inorganic ceramic pigments by inclusion of hematite in a fumed silica matrix. Leaching tests in boiling solutions of concentrated (36 wt%) hydrochloric acid demonstrated that, starting from mixtures of fumed silica and synthetic goethite, the occlusion of hematite occurs by calcination at 1150-1200 degrees C for 2-4 h. Better results were obtained by using fumed silica having surface area ranging from 300 to 400 m(2)/g. A continuos change in colour was measured by comparing L-a-b values of the calcined samples and more information were obtained by the Kubelka-Munk absorption function. Because its chemical and thermal stability, the obtained heteromorphic pigment may be considered a suitable red pigment for ceramic manufacturing by fast firing cycles.
1998
Syntheses of Fe2O3/silica red inorganic inclusion pigments for ceramic applications / Bondioli, Federica; A. M., Ferrari; C., Leonelli; T., Manfredini. - In: MATERIALS RESEARCH BULLETIN. - ISSN 0025-5408. - 33 (5):(1998), pp. 723-729.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2673313
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