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Fuel mixture approach for solution combustion synthesis of Ca3Al2O6 powders / Robert Ianoş in Cement and concrete research, Vol. 39 N° 7 (Juillet 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 7 (Juillet 2009) . - pp. 566–572 Titre : Fuel mixture approach for solution combustion synthesis of Ca3Al2O6 powders Type de document : texte imprimé Auteurs : Robert Ianoş, Auteur ; Ioan Lazău, Auteur ; Cornelia Păcurariu, Auteur Année de publication : 2009 Article en page(s) : pp. 566–572 Note générale : Génie Civil Langues : Anglais (eng) Résumé : Single-phase 3CaO·Al2O3 powders were prepared via solution combustion synthesis using a fuel mixture of urea and β-alanine. The concept of using this fuel mixture comes from the individual reactivity of calcium nitrate and aluminum nitrate with respect to urea and β-alanine. It was proved that urea is the optimum fuel for Al(NO3)3 whereas β-alanine is the most suitable fuel for Ca(NO3)2. X-ray diffraction and thermal analysis investigations revealed that heating at 300 °C the precursor mixture containing the desired metal nitrates, urea and β-alanine triggers a vigorous combustion reaction, which yields single-phase nanocrystalline 3CaO·Al2O3 powder (33.3 nm). In this case additional annealing was no longer required. The use of a single fuel failed to ensure the formation of 3CaO·Al2O3 directly from the combustion reaction. After annealing at 900 °C for 1 h, the powders obtained by using a single fuel (urea or β-alanine) developed a phase composition comprising of 3CaO·Al2O3, 12CaO·7Al2O3 and CaO. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000775 [article] Fuel mixture approach for solution combustion synthesis of Ca3Al2O6 powders [texte imprimé] / Robert Ianoş, Auteur ; Ioan Lazău, Auteur ; Cornelia Păcurariu, Auteur . - 2009 . - pp. 566–572. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 7 (Juillet 2009) . - pp. 566–572 Résumé : Single-phase 3CaO·Al2O3 powders were prepared via solution combustion synthesis using a fuel mixture of urea and β-alanine. The concept of using this fuel mixture comes from the individual reactivity of calcium nitrate and aluminum nitrate with respect to urea and β-alanine. It was proved that urea is the optimum fuel for Al(NO3)3 whereas β-alanine is the most suitable fuel for Ca(NO3)2. X-ray diffraction and thermal analysis investigations revealed that heating at 300 °C the precursor mixture containing the desired metal nitrates, urea and β-alanine triggers a vigorous combustion reaction, which yields single-phase nanocrystalline 3CaO·Al2O3 powder (33.3 nm). In this case additional annealing was no longer required. The use of a single fuel failed to ensure the formation of 3CaO·Al2O3 directly from the combustion reaction. After annealing at 900 °C for 1 h, the powders obtained by using a single fuel (urea or β-alanine) developed a phase composition comprising of 3CaO·Al2O3, 12CaO·7Al2O3 and CaO. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000775