Mold material mixtures on the basis of inorganic binders, and method for producing molds and cores for metal casting
AssigneeASK Chemicals GmbH
InventorsDennis Bartels, Heinz Deters, Antoni Gieniec, Diether Koch, Hannes Lincke, Martin Oberleiter, Oliver Schmidt, Carolin Wallenhorst
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Abstract
The invention relates to mold material mixtures on the basis of inorganic binders, for producing molds and cores for metal casting. Said mixtures consist of at least one refractory mold base material, an inorganic binder and amorphous silicon dioxide as an additive. The invention also relates to a method for producing molds and cores using said mold material mixtures.
Claims21
A mixture for producing molding forms and cores for metal processing, comprising:
- a refractory mold base material;
- an inorganic binder;
- and
- a particulate amorphous SiO2, obtained by thermal decomposing ZrSiO4 to ZrO2 and SiO2, such that the particulate amorphous SiO2 comprises zirconium compounds, calculated as ZrO2, in an amount of greater than 0.01 wt. % to smaller than 12 wt. %.
A mixture for producing molding forms and cores for metal processing, comprising:
- a refractory mold base material;
- an inorganic binder based on water glass with a SiO2/M2O molar ratio in the range of 1.6 to 4.0, wherein M represents lithium, sodium and potassium;
- and
- a particulate amorphous SiO2 that is obtained by thermal decomposing ZrSiO4 to ZrO2 and SiO2, such that the particulate amorphous SiO2 has a mean particle size (diameter), as determined by dynamic light scattering that is between 0.05 μm and 10 μm, the particulate amorphous SiO2 being present at an amount of from 0.1 to 2 wt. %, with the particulate amorphous SiO2 comprising zirconium compounds, calculated as ZrO2, in an amount of greater than 0.01 wt. % to smaller than 12 wt. %, based on the total weight of the amorphous SiO2.
Dependencies are inferred from the claim text.