Silicon oxide based articles
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United States of America Patent
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Issued Date -
Oct 5, 2006
app pub date -
Mar 12, 2004
filing date -
Mar 21, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Particularly shaped articles constituted by silicon oxide, as such or with suitable additives, prepared by room temperature molding according to a process comprising: preparation of a sol starting from a silicon alcoxide, or from a silicon alcoxide and at least a precursor of at least one of the additional elements; hydrolysis of the sol obtained thereby; addition of colloidal silica; pouring the resulting mixture into the desired mould; sol gelling and fast removal of the solid product; gel drying; gel densification by means of a thermal treatment at temperature ranging from 900 .degree. C to 1500 .degree. C. The articles can be used as preforms for the optic fiber spinning.
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