Method for reducing metal-mold reaction
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United States of America Patent
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Oct 20, 2020
Grant Date -
Mar 8, 2018
app pub date -
Nov 14, 2017
filing date -
May 14, 2015
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Abstract
Defects can arise in a product of a metal casting process from reactions occurring at a metal-mold interface. A method that reduces the defects uses an organic binder system by introducing a separate third component to a two-part polyurethane-based binder system used in the cold box or no bake process. The third part is added only after the first two parts are mixed with a refractory molding material to provide a shapeable foundry mix. The third part is an alkyl silicate, such as tetraethyl orthosilicate (“TEOS”), an alkyl orthoformate, such as trimethyl orthoformate (TMOF) or triethyl orthoformate (TEOF), or combinations thereof.
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