Process for fabricating fluorine-doped sol-gel article

Details Process for fabricating fluorine-doped sol-gel article Process for fabricating fluorine-doped sol-gel article

C - Chemistry, Metallurgy

03

B

C03B 19/06 (2006.01) C03B 19/12 (2006.01) C03B 37/016 (2006.01) C03C 1/00 (2006.01)

Patent

CA 2335265

The invention reflects discovery of a liquid phase doping technique that, unlike previous techniques, exhibits very little fluorine depletion upon subsequent heating. The invention involves the steps of providing a silica sol comprising a tetraalkylammonium hydroxide and a di-, tri-, or tetra-alkylammonium fluoride, the sol having pH of about 10 to about 14, adding a gelling agent to the sol to induce gelation, casting or extruding the sol to form a gel body, and then drying, heat treating, and sintering the body. Advantageously, the fluorine-containing compound is tetramethylammonium fluoride.

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