Zinc-containing phosphate glasses

Details Zinc-containing phosphate glasses Zinc-containing phosphate glasses

1989-12-26

1990-07-10

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 44, 501 47, 501 48, C03C 316, C03C 317, C03C 319, C03C 3247

Patent

active

049406779

ABSTRACT:
This invention is directed to the preparation of glasses exhibiting a transition temperature below 450.degree. C., a working temperature below 500.degree. C., and excellent resistance to attack by water and mild aqueous alkaline solutions. The glasses consist essentially, in mole percent, of at least 65% total of 23-55% ZnO, 28-40% P.sub.2 O.sub.5, and 10-35% R.sub.2 O, wherein R.sub.2 O consists of at least two alkali metal oxides in the indicated proportions selected from the group consisting of 0-25% Li.sub.2 O, 0-25% Na.sub.2 O, and 0-25% K.sub.2 O, and up to 35% total of optional ingredients in the indicated proportions selected from the group consisting of 0-6% Al.sub.2 O.sub.3, 0-8% B.sub.2 O.sub.3, 0-8% Al.sub.2 O.sub.3 +B.sub.2 O.sub.3, 0-15% Cu.sub.2 O, 0-5% F, 0-35% PbO, 0-35% SnO, 0-35% PbO+SnO, 0-5% ZrO.sub.2, 0-4% SiO.sub.2, and 0-15% MgO+CaO+SrO+BaO+MnO, consisting of 0-10% MgO, 0-10% CaO, 0-10% SrO, 0-12% BaO, and 0- 10% MnO.

REFERENCES:
patent: 3215543 (1965-11-01), Bre
patent: 3248234 (1966-04-01), Godron
patent: 3979322 (1976-09-01), Alexeeu et al.
patent: 4439530 (1984-03-01), Tajima
patent: 4544974 (1985-10-01), West, Jr. et al.

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