Method of manufacturing a silica powder and use of such a powder in making an optical fiber preform
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United States of America Patent
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Apr 11, 2000
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N/A
app pub date -
May 6, 1997
filing date -
Jul 7, 1992
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Abstract
A method of manufacturing a silica powder using a sol-gel technique, wherein a suspension consisting of synthetic silica soot, having a specific surface area of less than 80 m.sup.2 /g, is made in water to form a concentration of 50% to 75% by weight of silica; the suspension is gelled; the resulting gel is dried without forming a crust and with microwaves and broken up into silica grains having an apparent density of 0.5 g/cm.sup.3 to 0.6 g/cm.sup.3 ; and screening of the dry gel is performed to provide grains having a desired size.
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