Ground calcined alumina for input in a precursor composition for refractory material and method for obtaining same
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United States of America Patent
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Oct 24, 2006
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app pub date -
Oct 17, 2002
filing date -
Oct 18, 2001
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Abstract
The invention concerns an additive-containing ground calcined alumina used as constituent of a refractory material precursor characterized in that it comprises an organofunctional silane, the organic function being typically an epoxy function, an alkyl function, an alcohol function or a diol function. Preferably said organofunctional silane is an oxyranyl-alkyl-silane, of chemical formula C.sub.9H.sub.20O.sub.5Si. Said additive-containing alumina can be obtained by adding said organofunctional silane during grinding to take advantage of its anti-caking properties, the intimate and homogeneous mixture being obtained as a result of grinding. It may also result from a post-grinding mixing.
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