US2002065187A1PendingUtilityA1
Glass sheet intended to be thermally toughened
Est. expiryMar 2, 2018(expired)· nominal 20-yr term from priority
C03C 3/087C03C 4/00
40
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Claims
Abstract
The subject of the invention is a glass sheet intended to be thermally toughened, the matrix of which is of the silica-soda-lime type, having an expansion coefficient α of greater than 100×10 −7 K −1 , a Young's modulus E of greater than 60 GPa and a thermal conductivity k of less than 0.9 W/m.K.
Claims
exact text as granted — not AI-modified1 . A glass sheet intended to be thermally toughened, comprising a silica-soda matrix, wherein said sheet has an expansion cofficient α of greater than 100×10 −7 K −1 , a Young's modulus E of greater than 60 GPa and a thermal conductivity k of less than 0.9 W/m.K.
2 . The glass sheet of claim 1 , wherein said sheet has a Poisson's ratio of greater than 0.21.
3 . The glass sheet of claim 2 , wherein said sheet has a specific heat of greater than 7.40 J/kg.K.
4 . The glass sheet of claim 1 , wherein said sheet has a specific heat of greater than 7.40 J/kg.K.
5 . The glass sheet of claim 1 , wherein said sheet has a density of greater than 2520 kg/m 3 .
6 . The glass sheet of claim 1 , wherein said sheet satisfies the relationship:
α· E/K> 8000.
7 . The glass sheet of claim 1 , wherein said matrix comprises, in percentages by weight, the following constituents:
SiO 2
45-69%
Al 2 O 3
0-14%
CaO
0-22%
MgO
0-10%
Na 2 O
6-24%
K 2 O
0-10%
BaO
0-12%
B 2 O 3
0-6%
ZnO
0-10%
and satisfies the relationships:
Na 2 O+K 2 O>20%Na 2 O+K 2 O+CaO>27%.
8 . The glass sheet of claim 1 , wherein said matrix comprises, in percentages by weight, the following constituents:
SiO 2
45-69%
Al 2 O 3
0-14%
CaO
0-22%
MgO
0-10%
Na 2 O
6-24%
K 2 O
0-10%
BaO
0-12%
B 2 O 3
0-6%
ZnO
0-10%
and satisfies the relationships:
Na 2 O+K 2 O>17%Na 2 O+K 2 O+CaO>35%.
9 . The glass sheet of claim 1 , wherein said matrix comprises, in percentages by weight, at least one of Na 2 O and K 2 O in amounts which satisfy the following relationship:
Na 2 O+K 2 O>17%.
10 . The glass sheet of claim 1 , wherein said matrix comprises, in percentages by weight, the following constituents:
SiO 2
45-69%
Al 2 O 3
0-14%
CaO
0-22%
MgO
0-10%
Na 2 O
6-24%
K 2 O
0-10%
BaO
0-12%
B 2 O 3
0-6%
ZnO
0-10%
and satisfies the relationships:
(a) Na 2 O+K 2 O>17%, and
(b) Na 2 O+K 2 O+CaO>29% when at least one of Na 2 O>18%, K 2 O>5%, and Al 2 O 3 <3%.
11 . The glass sheet of claim 9 , wherein said matrix comprises, in percentages by weight, at least one of TiO 2 and Al 2 O 3 in amounts which satisfy the relationship:
TiO 2 +Al 2 O 3 <3%.
12 . The glass sheet of claim 1 , wherein said matrix comprises, in percentages by weight, at least one of Na 2 O, K 2 O, CaO, and Al 2 O 3 in amounts which satisfy the following relationships:
(a) Na 2 O+K 2 O>17%, and (b) Na 2 O+K 2 O+CaO>29% when at least one of Na 2 O>18%, K 2 O>5%, and Al 2 O 3 <3%.
13 . The glass sheet according to claim 1 , wherein said sheet has a thickness of less than 2.5 mm and is thermally toughened.
14 . The glass sheet of claim 1 , wherein said matrix comprises Na 2 O and optionally one or more of K 2 O, CaO or Al 2 O 3 in amounts which satisfy the following relationship:
Na 2 O+K 2 O+CaO>29 wt %
when at least one of Na 2 O>18 wt %, K 2 O>5 wt %, and Al 2 O 3 <3 wt %.
15 . The glass sheet of claim 1 , wherein said matrix has a CaO content of 10.4 to 22 wt %.
16 . A glass sheet intended to be thermally toughened, comprising a silica-soda matrix, wherein said sheet has an expansion cofficient α of greater than 100×10 −7 K −1 , a Young's modulus E of greater than 60 GPa and a thermal conductivity k of less than 0.9 W/m.K and said matrix has a SiO 2 content of 45 to 65 wt %, wherein said matrix comprises Na 2 O and optionally K 2 O in amounts which satisfy the following relationship:
Na 2 O+K 2 O>20wt %.
17 . A glass composition comprising, in percentages by weight:
SiO 2
45-69%
Al 2 O 3
0-14%
CaO
0-22%
MgO
0-10%
Na 2 O
6-24%
K 2 O
0-10%
BaO
0-12%
B 2 O 3
0-6%
ZnO
0-10%,
wherein the glass has a viscosity η in poise, a forming temperature at which log η=3.5, and a liquidus temperature which is less than or equal to the forming temperature.
18 . The glass composition of claim 17 , wherein the liquidus temperature is between 10° C. and 30° C. less than the forming temperature.
19 . The glass composition of claim 18 , wherein the glass has an expansion coefficient of greater than 100×10 −7 K −1 .
20 . The glass composition of claim 19 , wherein the glass has a Young's modulus of greater than 60 GPa.
21 . The glass composition of claim 19 , wherein the glass has a thermal conductivity of less than 0.9 W/m.K.Join the waitlist — get patent alerts
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