Process for the production of an optical glass article

Details Process for the production of an optical glass article Process for the production of an optical glass article

1981-09-11

1983-06-21

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 311, 65 315, 65 3013, 501 12, C03C 1502

Patent

active

043892337

ABSTRACT:
This invention relates to a process for the production of an optical glass article, which comprises neutralizing an aqueous solution containing silicic acid to form a porous gelled body, removing soluble materials from the porous gelled body to form a porous glass body, stuffing the porous glass body with a solution containing at least one compound capable of being converted into an oxide dopant for changing the refractive index of the glass body, selected from the group consisting of CsNO.sub.3, RbNO.sub.3 and TlNO.sub.3, unstuffing the glass body with a solvent or solution having a suitable composition at a suitable temperature to leach the compound out of the outside glass body and to give a predetermined concentration distribution in the micropores of the glass body, optionally immersing the unstuffed body in an organic solvent, precipitating the compound in the micropores, drying the glass body in a predetermined atmosphere to decompose the compound, further heating at a higher temperature, and then firing at a temperature sufficiently high to completely decompose the compound and to completely burn the organic materials, but lower than the melting point of silica.

REFERENCES:
patent: 3640093 (1972-02-01), Levene et al.
patent: 4059658 (1977-11-01), Shoup et al.
patent: 4110093 (1978-08-01), Macedo et al.
patent: 4112032 (1978-09-01), Blaszyk et al.
patent: 4317668 (1982-03-01), Susa et al.

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