Engineered low-density heterogeneous microparticles and methods and formulations for producing the microparticles
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United States of America Patent
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Dec 17, 2013
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Apr 24, 2008
app pub date -
Dec 8, 2006
filing date -
Dec 8, 2005
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Abstract
A low density material and a method for preparing a low-density material and precursor for forming a low-density material are provided. An aqueous mixture of inorganic primary component and a blowing agent is formed, the mixture is dried and optionally ground to form an expandable precursor. Such a precursor is then fired with activation of the blowing agent being controlled such that it is activated within a predetermined optimal temperature range. The firing conditions are also controlled to provide a low density sphere containing a heterogeneous sphere wall structure comprising a combination of amorphous glass and a crystalline phase or gas phase or both.
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