Molding material mixture containing phosphorus for producing...

Details Molding material mixture containing phosphorus for producing... Molding material mixture containing phosphorus for producing...

B - Operations, Transporting

22

C

B22C 1/18 (2006.01)

Patent

CA 2666761

The invention relates to a moulding material mixture for producing casting moulds for machining metal, to a method for producing casting moulds, and to casting mouldes obtained according to said method and to the use thereof. A fire-resistant moulding base material and a binding agent based on water glass is used in the production of said casting moulds. A proportion of a particulate metal oxide is added to the binding agent, said metal oxide being selected from the group of silicon dioxide, aluminium oxide, titanium oxide and zinc oxide. Synthetic amorphous silicon dioxide is preferably used. Said moulding material mixture contains a phosphate as an essential component. The addition of phosphate permits the mechanical resistance of casting moulds to be improved under high thermal stress.

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 principal constituant un phosphate. L'adjonction de phosphate permet de renforcer la résistance mécanique de moules en cas de forte sollicitation thermique.

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