Process for dewatering porous glass

Details Process for dewatering porous glass Process for dewatering porous glass

1986-06-30

1988-09-20

Schor, Kenneth M.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 32, 65900, C03C 2300

Patent

active

047723050

ABSTRACT:
There is disclosed a method of dewatering porous 96% silica glass by impregnating the glass pores with an aqueous solution of a water-soluble, nitrogen-containing, organic compound that is thermally decomposable to produce reactive gaseous nitrogen species, and then thermally decomposing the impregnating compound to yield nitrogen which combines with the glass to oust hydroxyl group. A preferred material is guanidine hydrochloride, and a non-oxidizing atmosphere is maintained during heating to avoid nitrogen oxidation. The nitrided porous glass may subsequently be thermally consolidated to a non-porous body.

REFERENCES:
patent: 2106744 (1938-02-01), Hood et al.
patent: 2315329 (1943-03-01), Hood et al.
patent: 3775078 (1973-11-01), Elmer et al.
patent: 3826560 (1974-07-01), Schultz
patent: 4105427 (1978-08-01), Elmer
patent: 4203744 (1980-05-01), Schultz et al.

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