Alkali-free aluminoborosilicate glass and its use

Details Alkali-free aluminoborosilicate glass and its use Alkali-free aluminoborosilicate glass and its use

1997-01-31

1998-06-23

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 70, C03C 3093

Patent

active

057705356

ABSTRACT:
An alkali-free aluminoborosilicate glass preferably with a thermal expansion .alpha..sub.20/300 of about 3.7 .times.10.sup.-6 /K, an annealing temperature OKP of above 700.degree. C., a treatment temperature V.sub.A of less than 1220.degree. C., and very good chemical stability, which can be produced in a float unit and has the following composition (in % by weight based on oxide): SiO.sub.2 52-62; B.sub.2 O.sub.3 4-14; Al.sub.2 O.sub.3 12-20; MgO 0-8; CaO 4-11; BaO 0-2; ZnO 2-8; ZrO.sub.2 0-2; SnO.sub.2 0-2. The ratio of Al.sub.2 O.sub.3 /B.sub.2 O.sub.3 is preferably equal to or greater than 3. The glass is especially suitable for use in display technology.

REFERENCES:
patent: 3496401 (1970-02-01), Dumbaugh, Jr.
patent: 4640900 (1987-02-01), Kokubu et al.
patent: 5244847 (1993-09-01), Kushitani et al.
patent: 5348916 (1994-09-01), Kushitani et al.
patent: 5508237 (1996-04-01), Moffat et al.

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