Method of making silica sand molds and cores for metal founding
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United States of America Patent
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Jun 15, 1999
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N/A
app pub date -
Sep 20, 1996
filing date -
Nov 16, 1992
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Abstract
Thermal expansion defects, i.e. veining, are reduced in iron, steel, and nonferrous castings by adding a lithia-containing material in a sufficient amount to the silica sand mold to provide about 0.001% to about 2.0% of lithia. The addition of lithia is accomplished by adding lithium bearing minerals such as .alpha.-spodumene, amblygonite, montebrasite, petalite, lepidolite, zinnwaldite, eucryptite or lithium carbonate.
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