USING SILICON TETRAFLOURIDE DURING POWDER-IN-TUBE (PIT) PROCESS
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United States of America Patent
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Issued Date -
Sep 8, 2016
app pub date -
Mar 6, 2015
filing date -
Mar 6, 2015
priority date (Note) -
Abandoned
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Abstract
The embodiments disclosed herein seek to ameliorate the high costs associated with the use of ultra-pure silica by using a lower-cost starting material and purifying the lower-cost starting material to an acceptable level of purity during the preform manufacturing process. In one embodiment, instead of using fully densified silica crystals, the disclosed process uses porous silica grains that have a substantially monodisperse size distribution as the starting materials for a powder-in-tube preform manufacturing process and utilize silicon tetrafloride doping to promote silica dehydration.
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