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US 2015/0174644 A1Published application
Molding material mixtures containing barium sulfate
AssigneeASK Chemicals GmbH
InventorsHeinz Deters, Jörg Körschgen, Martin Oberleiter
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Abstract
The invention relates to molding material mixtures containing barium sulfate in combination with refractory basic molding materials and a waterglass-based binder system for producing casting molds and cores for the foundry industry in order to obtain cast pieces, in particular aluminum ones, which have an improved cast surface.
Claims20
A molding material mixture for producing casting molds for metal processing, comprising:
- a refractory basic molding material,
- a binder based on water glass,
- barium sulfate;
- and
- particulate metal oxides selected from the group consisting of:
- amorphous SiO2, aluminum oxides, aluminosilicates and mixtures thereof.
3 more elements
A method of producing a mold or core for casting pieces from aluminum or an aluminum alloy with an improved cast surface, comprising the step of:
- producing a molding material mixture containing barium sulfate, a waterglass-based binder and particulate metal oxides selected from the group consisting of:
- amorphous SiO2 aluminum oxides aluminosilicates and mixtures thereof.
Dependencies are inferred from the claim text.