Foundry sand
AssigneesIluka Resources Limited, University of Northern Iowa Research Foundation
InventorsGerard Thiel, Sairam Ravi
Life of this patent
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Abstract
A foundry sand comprises a blend that includes a silica sand and a zircon aggregate. The zircon aggregate exhibiting a sharp rise in linear thermal expansion coefficient in a temperature band above 1200° C. A method of casting an article in molten metal at a temperature above 1200° C. includes forming a single or multi-part mold for the article from the above-described foundry sand, admitting molten metal to the mold at a temperature such that at least one or more regions of the foundry sand in contact with the admitted metal are heated to a temperature within the temperature band, and cooling the mold and metal to obtain a cast article.
Claims23
A foundry sand comprising a blend that includes a silica sand and a zircon aggregate, the zircon aggregate exhibiting a sharp rise in linear thermal expansion coefficient in a temperature band above 1200° C.
A method of casting an article in molten metal at a temperature above 1200° C., comprising:
- forming a single or multi-part mould for the article from a foundry sand comprising a blend that includes a silica sand and a zircon aggregate, the zircon aggregate exhibiting a sharp rise in linear thermal expansion coefficient in a temperature band above 1200° C.;
- admitting molten metal to the mould at a temperature such that at least one or more regions of the foundry sand in contact with the admitted metal are heated to a temperature within said temperature band;
- and
- cooling the mould and metal to obtain a cast article.
A method of casting an article in molten metal at a temperature above 1200° C., comprising:
- sourcing and/or supplying a zircon aggregate that exhibits a sharp rise in linear thermal expansion coefficient in a temperature band above 1200° C.;
- forming a single or multi-part mould for the article from a foundry sand comprising a blend that includes a silica sand and said zircon aggregate;
- admitting molten metal to the mould at a temperature such that at least one or more regions of the foundry sand in contact with the admitted metal are heated to a temperature within said temperature band;
- and
- cooling the mould and metal to obtain a cast article.
Dependencies are inferred from the claim text.