US2009018007A1PendingUtilityA1
Lithium-aluminosilicate glass with short glazing times
Est. expiryMar 20, 2026(expired)· nominal 20-yr term from priority
C03C 10/0027C03C 10/0045C03C 3/095C03C 10/0054
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Claims
Abstract
A lithium-aluminosilicate glass or a corresponding glass ceramic that has a content of 0-0.4 SnO 2 , 1.3-2.7% by weight of ΣSnO 2 +TiO 2 , 1.3-2.5% by weight of ZrO 2 , 3.65-4.3% by weight of ΣZrO 2 +0.87 (TiO 2 +SnO 2 ), ≦0.04% by weight of Fe 2 O 3 , 50-4000 ppm of Nd 2 O 3 and 0-50 ppm of CoO is described. The glass or the glass ceramic is color-neutral, has a turbidity of less than 1% HAZE and a high light transmission. The glazing time for conversion of the glass into glass ceramic is especially short with less than 2.5 hours.
Claims
exact text as granted — not AI-modified1 . Lithium-aluminosilicate glass, which can be converted with glazing times of under 2.5 hours into a transparent glass ceramic with high-quartz mixed crystals as the prevailing crystal phase, which has a turbidity of less than 1% according to ASTM D 1003 and has a neutral color shade, characterized by a content in % by weight based on oxide of:
0-0.4
SnO 2
1.3-2.7
ΣSnO 2 + TiO 2
1.3-2.5
ZrO 2
3.65-4.3
ΣZrO 2 + 0.87 (TiO 2 + SnO 2 )
≦0.04
Fe 2 O 3
0.005-0.4
Nd 2 O 3
0-0.005
CoO
2 . Lithium-aluminosilicate glass according to claim 1 , characterized by a content (in % by weight based on oxide) of:
Li 2 O
3.0-4.5
Na 2 O
0-1.5
K 2 O
0-1.5
ΣNa 2 O + K 2 O
0.2-2.0
MgO
0-2.0
CaO
0-1.5
SrO
0-1.5
BaO
0-2.5
ZnO
0-2.5
B 2 O 3
0-1.0
Al 2 O 3
19-25
SiO 2
55-69
TiO 2
1.4-2.7
ZrO 2
1.3-2.5
SnO 2
0-0.4
ΣSnO 2 + TiO 2
<2.7
P 2 O 5
0-3.0
Nd 2 O 3
0.01-0.4
CoO
0-0.004
optionally with additions of chemical refining agents such as As 2 O 3 , Sb 2 O 3 , and CeO 2 and refining additives such as sulfate, chloride and fluoride compounds in total contents of up to 2.0% by weight.
3 . Lithium-aluminosilicate glass according to claim 2 , characterized by a content (in % by weight based on oxide) of:
Li 2 O
3.2-4.3
Na 2 O
0.2-1.0
K 2 O
0-0.8
ΣNa 2 O + K 2 O
0.3-1.5
MgO
0.1-1.5
CaO
0-1.0
SrO
0-1.0
BaO
0-2.5
ZnO
0-2.0
Al 2 O 3
19-24
SiO 2
60-68
TiO 2
1.4-2.7
ZrO 2
1.3-2.2
SnO 2
0-0.3
ΣSnO 2 + TiO 2
<2.7
P 2 O 5
0-1.5
Nd 2 O 3
0.02-0.3
CoO
0-0.003
optionally with the additions of chemical refining agents such as As 2 O 3 , Sb 2 O 3 , and CeO 2 and refining additives such as sulfate compounds, chloride compounds, and fluoride compounds in total amounts of up to 1.5% by weight.
4 . Lithium-aluminosilicate glass according to claim 1 , characterized by an MgO content of <0.8, preferably <0.6% by weight.
5 . Glass ceramic, converted from a lithium-aluminosilicate glass with a composition according to claim 1 .
6 . Transparent glass ceramic converted from a lithium-aluminosilicate glass with a composition according to claim 1 , with a content of Nd 2 O 3 <2000 ppm, CoO<20 ppm and a thermal expansion coefficient α 20/700 of 0±0.5·10 −6 /K, preferably 0±0.3·10 −6 /K, a light transmission with a thickness of 4 mm of greater than 80% and a variegation of colors in the CIELAB color system C*<3.5.
7 . Use of the transparent glass ceramic, converted from a lithium-aluminosilicate glass with a composition according to claim 1 , as fire protection glass, fireplace door windows, oven door windows, cooking surfaces with bottom coating and covers in the lighting sector.Join the waitlist — get patent alerts
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