Molding material mixture containing carbohydrates

B - Operations – Transporting – 22 – C

Patent

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Details

B22C 1/18 (2006.01) B22C 1/26 (2006.01)

Patent

CA 2666760

The invention relates to a moulding material mixture for producing casting moulds for machining metal, to a method for producing casting moulds, to casting moulds obtained according to said method and to the use thereof. A fire-resistant moulding base material and a binding agent based on water glass are used in the production of casting moulds. A fraction of the particulate metal oxide is added to the binding agent, said metal oxide being selected from the group comprising silicon dioxide, aluminium oxide, titanium oxide and zinc oxide. Synthetic amorphous silicon dioxide is preferably used. Said moulding material mixture contains a carbohydrate as an additional component. The mechanical resistance of casting moulds and the quality of the surface of the casting piece can be improved by adding carbohydrates.

L'invention concerne un mélange de matières de moulage utilisé pour produire des moules pour la transformation des métaux, un procédé pour produire des moules, des moules obtenus selon ledit procédé et leur utilisation. Pour produire les moules, il est prévu d'utiliser une matière de base de moulage réfractaire et un liant à base de verre soluble. Une part d'oxyde de métal particulaire est ajoutée au liant, ledit oxyde de métal étant sélectionné dans le groupe comprenant le dioxyde de silicium, l'oxyde d'aluminium, l'oxyde de titane et l'oxyde de zinc, le dioxyde de silicium synthétique amorphe étant tout particulièrement utilisé. Le mélange de matières de moulage contient comme autre constituant un hydrate de carbone. L'adjonction d'hydrates de carbone permet de renforcer la résistance mécanique de moules, ainsi que la qualité de surface de la pièce coulée.

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