Glass useful as either photosensitive glass or opaline foam glas

Details Glass useful as either photosensitive glass or opaline foam glas Glass useful as either photosensitive glass or opaline foam glas

1986-05-09

1987-10-27

Lander, Ferris H.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 42, 501 45, 501 48, 501 49, 501 73, 501 77, C03C 402, C03C 404

Patent

active

047030194

ABSTRACT:
The invention relates to a photosensitive and heat-sensitive glass which is composed of 25-70 mol % of Al.sub.2 O.sub.3 and/or Ga.sub.2 O.sub.3, 30-75 mol % of at least one of CaO, BaO, SrO and MgO and 0-40 mol % of an auxiliary component which is at least one of SiO.sub.2, GeO.sub.2, B.sub.2 O.sub.3 and P.sub.2 O.sub.5. The glass is produced by melting a batch mixture of powdery raw materials. By exposure to UV rays the glass colors in yellowish brown, and the color does not fade by termination of the exposure. Bleaching of the colored glass is accomplished by heating for a short time at about 150.degree.-300.degree. C. Coloration and bleaching can be repeated without deterioration. The same glass turns into an opaline foam glass, which presents a very attractive appearance, by heat treatment at a temperature above the softening temperature. This change is irreversible. The foams created in the glass matrix are usually tens of microns in diameter.

REFERENCES:
G. Whichard and D. E. Day; "Glass Formation and Properties in the Gallia-Calcia System; Journal of Non-Crystalline Solids; 66, (1984); pp. 477-487.
J. E. Shelby; "Formation and Properties of Calcium Aluminosilicate Glasses"; Journal of American Ceramic Society; 68, (1985); pp. 155-158.

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