GYPSUM COMPOSITION FOR REFRACTORY MOULDS

The invention concerns a mineral composition for preparing foundry moulds comprising (a) from 20 to 90 % by weight of gypsum (b) from 10 to 80 % by weight of a mineral component made from silica and/or alumina and (c) from 0.5 to 4.8 % and preferably from 1.5 to 4.5% by weight and in particular betw...

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Bibliographische Detailangaben
Hauptverfasser:	THIOLIERE STÉPHANE, PETIGNY NATHALIE, FOURDRIN EMMANUEL, RETOT HÉLÈNE
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE CASTING CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE FOUNDRY MOULDING LIME, MAGNESIA METALLURGY PERFORMING OPERATIONS POWDER METALLURGY REFRACTORIES SLAG TRANSPORTING TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	The invention concerns a mineral composition for preparing foundry moulds comprising (a) from 20 to 90 % by weight of gypsum (b) from 10 to 80 % by weight of a mineral component made from silica and/or alumina and (c) from 0.5 to 4.8 % and preferably from 1.5 to 4.5% by weight and in particular between 2 and 4.5 % by weight of a mineral powder having a thermal conductivity (ŋ) at 20 °C greater than 15W/(m.K) and a specific surface area greater than 10 m/g these percentages being relative to the total weight of the sum of components (a) (b) and (c).