Foam glass having a low coefficient of thermal expansion and related methods
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United States of America Patent
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Jan 20, 2015
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app pub date -
Jul 14, 2011
filing date -
Jul 19, 2010
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Abstract
Foam glass may include natural glass, wherein the foam glass includes greater than 5% alumina by weight of the foam glass and has a coefficient of thermal expansion ranging between 4×10−6 ppm/° C. and 6×10−6 ppm/° C. A composition for making foam glass may include natural glass including at least 5% alumina by weight of the composition, soda ash including less than 10% by weight of the composition, and boric acid including at least 5% by weight of the composition. A method for making foam glass may include mixing natural glass with boron to form a mixture, milling the mixture, melting the mixture at a temperature of at least 900° C., and allowing the melted mixture to cool, such that the foam glass includes at least 5% alumina by weight of the foam glass and at least 5% boron oxide by weight of the foam glass.
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