Fast response photosensitive opal glasses

Details Fast response photosensitive opal glasses Fast response photosensitive opal glasses

1989-08-07

1990-12-25

Schor, Kenneth M.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 323, 501 13, C03C 1500

Patent

active

049799754

ABSTRACT:
Photosensitively opacifiable glasses requiring very short exposures to ultraviolet radiation to effect the development of opacity are processed by heating to nucleate Ag followed by cooling to nucleate NaF on the Ag followed by heating to grow the NaF. The glasses contain, expressed in terms of weight percent on the oxide basis, about 14-18% Na.sub.2 O, 0-6% ZnO, 6-12% Al.sub.2 O.sub.3, 0-5% B.sub.2 O.sub.3, 65-72% SiO.sub.2, and 0-0.2% Sb.sub.2 O.sub.3, and 0.007-0.04% Ag, 0.008-0.05% CeO.sub.2, 0.7-1.25% Br, and 1.5-2.5% F as analyzed in the glass, the sum of those components are at least 90% of the total composition.

REFERENCES:
patent: 2477329 (1949-07-01), DeGier et al.
patent: 2651145 (1953-09-01), Stookey
patent: 4017318 (1977-04-01), Pierson et al.
patent: 4057408 (1977-11-01), Pierson et al.
patent: 4092139 (1978-05-01), Ference
patent: 4134747 (1979-01-01), Pierson et al.

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