| 摘要 |
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 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 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. |
