Refractory paints based on SiC were developped using inorganic aluminosilicates binders. In order to optimize the binders, different raw materials have been tested for their preparations (calcined kaolin, metakaolin, alfa-alumina and fumed silica synthetic powders). The alkali activator was an aqueous solution of KOH/K2SiO3. Calcined kaolin and metakaolin in alkaline conditions dissolved and re-precipitated to form geopolymer resins acting as a glue for the un-reacted Al-Si materials and SiC (90 wt.%). Binders based on alfa-alumina and fumed silica behaved as water glass. Binders and SiC paints were tested and characterized in inert and oxidative atmospheres up to 1300°C. The oxidation of the SiC paints was 50% lower thant that of pure SiC, evidencing a key role of the alkali aluminosilicate binders during thermal treatm,ents.
V. Medri, S. Fabbri, A. Ruffini, J. Dedecek, A. Vaccari (2011). Si-C based refractory paints prepared with alkali aluminosilicate binders. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 31, 2155-2165 [10.1016/j.jeurceramsoc.2011.05.006].
Si-C based refractory paints prepared with alkali aluminosilicate binders
VACCARI, ANGELO
2011
Abstract
Refractory paints based on SiC were developped using inorganic aluminosilicates binders. In order to optimize the binders, different raw materials have been tested for their preparations (calcined kaolin, metakaolin, alfa-alumina and fumed silica synthetic powders). The alkali activator was an aqueous solution of KOH/K2SiO3. Calcined kaolin and metakaolin in alkaline conditions dissolved and re-precipitated to form geopolymer resins acting as a glue for the un-reacted Al-Si materials and SiC (90 wt.%). Binders based on alfa-alumina and fumed silica behaved as water glass. Binders and SiC paints were tested and characterized in inert and oxidative atmospheres up to 1300°C. The oxidation of the SiC paints was 50% lower thant that of pure SiC, evidencing a key role of the alkali aluminosilicate binders during thermal treatm,ents.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
