$Gypsum composition for refractory moulds$

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	THIOLIERE STEPHANE, PETIGNY NATHALIE, RETOT HELENE, FOURDRIN EMMANUEL
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 (lambda), at 20 DEG C, greater than 15W/(m.K) and a specific surface area greater than 10 m2/g, preferably 15 to 30 m2/g, these percentages being relative to the total weight of the sum of components (a), (b) and (c).