Patent
Process for making non-porous, micron-sized high purity silica
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TLDR
In this paper, a process for making nonporous, dense, silica particles having a diameter of about 3 to 1000 microns, a nitrogen B.E.T. surface area less than about 1 m2/g, a total impurity content of less than 50 ppm and a metal impurity concentration of less about 15 ppm from an aqueous dispersion of fumed silica.Abstract:
A process for making non-porous, dense, silica particles having a diameter of about 3 to 1000 microns, a nitrogen B.E.T. surface area less than about 1 m2/g, a total impurity content of less than about 50 ppm and a metal impurity content of less than about 15 ppm from an aqueous dispersion of fumed silica. The particles are converted into porous particles and sintered in an atmosphere having a water partial pressure of from about 0.2 to about 0.8 atmosphere for temperatures below about 1200 °C.read more
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References
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Journal Article
Sol-gel processing of ceramics and glass
TL;DR: Preparation des ceramiques et verres par le procede sol-gel: cas des alcoolates polymerises and des sols colloidaux as discussed by the authors, i.e.
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Fabrication of sintered high-silica glasses
TL;DR: High-silica glasses are formed by sintering a dried gel at temperatures below the liquidus as discussed by the authors, where the gel may be formed by mixing colloidal silica particles or silica-containing liquids with appropriate liquids.
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Fabrication of high-silica glass article
TL;DR: In this paper, the incorporation of fluorine into a porous silica body, such as an unsintered body produced by a sol-gel method, by VAD or OVPO, reduces or eliminates bubble or pore formation upon re-heating of the glass formed by sintering of the porous material.
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TL;DR: In this article, particulate oxides, e.g., fumed silica, are prepared in nonaqueous media and the suspensions are used to cast shapes for glass or ceramic products.
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