Alumina fiber aggregate and its production method
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United States of America Patent
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Jun 8, 2004
Grant Date -
Nov 27, 2003
app pub date -
Mar 20, 2003
filing date -
Jul 23, 2001
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Abstract
An alumina fiber aggregate comprising alumina short fibers whose average diameter is 4.0 to 10.0 .mu.m and smallest diameter is not less than 3.0 .mu.m, and a method of producing an alumina fiber aggregate which comprises spinning a spinning solution containing basic aluminum chloride, a silicon compound, an organic polymer and water by the blowing method, and calcining the obtained aggregate of alumina short fiber precursor, the spinning solution being one in which the aluminum/silicon ratio is 99/1 to 65/35 calculated as Al.sub.2 O.sub.3 /SiO.sub.2 ratio by weight, the concentration of basic aluminum chloride is 180 to 200 g/L and the concentration of the organic polymer is 20 to 40 g/L. The alumina short fibers in the alumina fiber aggregate are enlarged in diameter to suppress scattering of the fibers.
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