US2005101469A1PendingUtilityA1
Aluminoborosilicate glass devoid of alkali and uses thereof
Priority: Mar 24, 2001Filed: Mar 6, 2002Published: May 12, 2005
Est. expiryMar 24, 2021(expired)· nominal 20-yr term from priority
C03C 3/091
42
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Claims
Abstract
The invention relates to an aluminoborosilicate glass devoid of alkali, which has the following composition (in wt. % relative to the oxide content): SiO 2 >58-70; B 2 O 3 0.5-<9; Al 2 O 3 10-25; MgO>8-15; CaO 0-<10; SrO-<3; BaO 0-<2; with MgO+CaO+SrO+BaO>8-18; ZnO 0-<2. Said glass is eminently suitable for use as substrate glass, both in display technology and in thin-film photovoltaic technology.
Claims
exact text as granted — not AI-modified1 . Alkali-free aluminoborosilicate glass which has the following composition (in % by weight, based on oxide):
Si0 2
>58-70
B 2 0 3
0.5-<9
Al 2 0 3
10-25
MgO
>8-15
CaO
0-<10
SrO
0-<3
BaO
0-<2
with MgO + CaO + SrO + BaO
>8-18
ZnO
0-<2
2 . Aluminoborosilicate glass according to claim 1 , characterized by the following composition (in % by weight, based on oxide):
Si0 2
>58-68
B 2 0 3
1-8.5
Al 2 0 3
14-24
MgO
>8-15
CaO
0-9
SrO
0-<3
BaO
0-<2
with MgO + CaO + SrO + BaO
>8-18
ZnO
0-<2
3 . Aluminoborosilicate glass according to claim 1 , characterized in that it comprises between 0 and 0.5% by weight of BaO.
4 . Aluminoborosilicate glass according to claim 1 , characterized in that it comprises between 0 and 1% by weight of SrO, preferably between 0 and 0.5% by weight of SrO.
5 . Aluminoborosilicate glass according to claim 1 , characterized in that it comprises at most 5% by weight of B 2 0 3 .
6 . Aluminoborosilicate glass according to claim 1 , characterized in that it additionally comprises:
Zr0 2
0-2
Ti0 2
0-2
with Zr0 2 + Ti0 2
0-2
As 2 0 3
0-1.5
Sb 2 0 3
0-1.5
Sn0 2
0-1.5
Ce0 2
0-1.5
Cl −
0-1.5
F −
0-1.5
SO 4 2−
0-1.5
with As 2 0 3 + Sb 2 0 3 + Sn0 2 +
<-1.5
Ce0 2 + Cl − + F − + 50 4 2−
7 . Aluminoborosilicate glass according to claim 1 , which has a coefficient of thermal expansion a20/300 of between 2.8·10 −6 /K and 3.9·10 −4 /K, a glass transition temperature Tg of >710° C., a density p of <2.55 g/cm 3 and an “acid resistance HCl” of <0.5 mg/cm 2 .
8 . Aluminoborosilicate glass according to claim 1 , has a modulus of elasticity of more than 80 GPa.
9 . Use of the aluminoborosilicate glass according to claim 1 as substrate glass in display technology.
10 . Use of the aluminoborosilicate glass according to claim 1 as substrate glass in thin-film photovoltaics.
11 . Use of the aluminoborosilicate glass according to claim 1 for the preparation of a substrate glass for hard disks.Join the waitlist — get patent alerts
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