High PbO-content glasses in the system SiO.sub.2 --PbO--M.sub.2

Details High PbO-content glasses in the system SiO.sub.2 --PbO--M.sub.2 High PbO-content glasses in the system SiO.sub.2 --PbO--M.sub.2

1985-02-05

1988-01-26

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 38, 501 57, 501 58, 501 59, 501 61, 501 62, 501 74, 501 75, 501 76, 501901, 501903, C03C 3102, C03C 1302, C03C 307, C03C 400

Patent

active

047216905

ABSTRACT:
High PbO-content glass in the optical range of flint and heavy flint glasses from the system SiO.sub.2 --PbO--M.sub.2 O wherein M.sub.2 O=alkali metal oxides, said glass having a minimum PbO content of 30 wt. % and a minimum M.sub.2 O content of 0.5 wt. %, are provided with enhanced chemical stability without loss of the desired optical position by replacing a portion of the SiO.sub.2 and PbO such that the glass contains 1.5-6 wt. % (TiO.sub.2 +ZrO.sub.2) and the ratio of TiO.sub.2 :ZrO.sub.2 is about 0.3-2.0.

REFERENCES:
patent: 3902910 (1975-09-01), Hares et al.
patent: 4038448 (1977-07-01), Boyd et al.
patent: 4211569 (1980-07-01), Hares et al.
patent: 4351906 (1982-09-01), Boudot et al.
patent: 4424090 (1984-01-01), Kyle
patent: 4562162 (1985-12-01), Sagara

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