US2003061835A1PendingUtilityA1
Glass plate and method for tempering a glass plate
Est. expiryMar 30, 2021(expired)· nominal 20-yr term from priority
C03B 27/04C03C 3/087C03C 23/007C03B 27/0413C03B 27/00
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Abstract
A method for tempering a glass plate having a thickness of from 2 to 3 mm, and having an average linear thermal expansion coefficient of at least 88×10 −7 /° C. at a temperature of from 50 to 300° C. and a softening point of from 715 to 740° C., which comprises quenching the glass plate from an initial glass temperature of quenching at which the viscosity is within a range of from 10 9 to 10 10 poise to a temperature at which the viscosity is 10 12 poise, so that the heat transfer coefficient h (W/m 2 K) satisfies the following formula (1), where t (mm) is a glass plate thickness: h >4970.5-3149.9 t +550.3 t 2 formula (1)
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A method for tempering a glass plate having a thickness of from 2 to 3 mm, and having an average linear thermal expansion coefficient of at least 88×10 −7 /° C. at a temperature of from 50 to 300° C. and a softening point of from 715 to 740° C., which comprises quenching the glass plate from an initial glass temperature of quenching at which the viscosity is within a range of from 10 9 to 10 10 poise to a temperature at which the viscosity is 10 12 poise, so that the heat transfer coefficient h (W/m 2 K) satisfies the following formula (1), where t (mm) is a glass plate thickness:
h> 4970.5−3149.9 t+ 550.3 t formula (1)
2 . A method for tempering a glass plate having a thickness of from 2 to 3 mm, and having an average linear thermal expansion coefficient of at least 88×10 −7 /° C. at a temperature of from 50 to 300° C. and a softening point of from 715 to 740° C., which comprises quenching the glass plate from an initial glass temperature of quenching at which the viscosity is within a range of from 10 9 to 10 10 poise to a temperature at which the viscosity is 10 12 poise, so that the heat transfer coefficient h (W/m 2 K) satisfies the following formula (2), where t (mm) is a glass plate thickness:
h> 2123.6 ·t −1.4641 formula (2)
3 . The method for tempering a glass plate according to claim 1 , wherein a glass plate having the following composition is tempered:
SiO 2
66.0-74.0 mass %,
Al 2 O 3
1.5-4.0 mass %,
CaO
7.0-10.0 mass %,
MgO
3.8-6.0 mass %,
Na 2 O
12.6-14.6 mass % and
K 2 O
0.4-2.0 mass %,
in a total amount of these components of at least 96 mass %, and
SiO 2 + Al 2 O 3
70.0-74.0 mass %,
CaO + MgO
12.0-14.5 mass % and
Na 2 O + K 2 O
13.5-15.5 mass %.
4 . The method for tempering a glass plate according to claim 3 , wherein a glass plate having the following composition is tempered:
Al 2 O 3
2.0-4.0 mass %,
CaO + MgO
12.5-14.5 mass % and
CaO/MgO
(mass ratio) = 1.7-2.2.
5 . The method for tempering a glass plate according to claim 2 , wherein a glass plate having the following composition is tempered:
SiO 2
66.0-74.0 mass %,
Al 2 O 3
1.5-4.0 mass %,
CaO
7.0-10.0 mass %,
MgO
3.8-6.0 mass %,
Na 2 O
12.6-14.6 mass % and
K 2 O
0.4-2.0 mass %,
in a total amount of these components of at least 96 mass %, and
SiO 2 + Al 2 O 3
70.0-74.0 mass %,
CaO + MgO
12.0-14.5 mass % and
Na 2 O + K 2 O
13.5-15.5 mass %.
6 . The method for tempering a glass plate according to claim 5 , wherein a glass plate having the following composition is tempered:
Al 2 O 3
2.0-4.0 mass %,
CaO + MgO
12.5-14.5 mass % and
CaO/MgO
(mass ratio) = 1.7-2.2.
7 . The method for tempering a glass plate according to claim 3 , wherein the glass plate has at least one member selected from the group consisting of Fe 2 O 3 , CoO, Se, NiO, Cr 2 O 3 , MnO, V 2 O 5 , TiO 2 , CeO 2 , SnO, ZnO and SO 3 added thereto.
8 . The method for tempering a glass plate according to claim 5 , wherein the glass plate has at least one member selected from the group consisting of Fe 2 O 3 , CoO, Se, NiO, Cr 2 O 3 , MnO, V 2 O 5 , TiO 2 , CeO 2 , SnO, ZnO and SO 3 added thereto.
9 . The method for tempering a glass plate according to claim 1 , wherein the glass plate has a thickness of from 2 to 3 mm.
10 . The method for tempering a glass plate according to claim 1 , wherein the glass plate is obtained by a float process.
11 . The method for tempering a glass plate according to claim 1 , wherein the glass plate is used as a window glass for automobiles.
12 . A glass plate which has the following composition:
SiO 2
66.0-74.0 mass %,
Al 2 O 3
2.0-4.0 mass %,
CaO
7.0-10.0 mass %,
MgO
3.8-6.0 mass %,
Na 2 O
12.6-14.6 mass % and
K 2 O
0.4-2.0 mass %,
in a total amount of these components of at least 96 mass %, and
SiO 2 + Al 2 O 3
70.0-74.0 mass %,
CaO + MgO
12.5-14.5 mass %,
Na 2 O + K 2 O
13.5-15.5 mass %, and
CaO/MgO
(mass ratio) = 1.7-2.2.
13 . The glass plate according to claim 12 , which is obtained by tempering a glass plate having the following composition:
Al 2 O 3
2.0-4.0 mass %,
CaO + MgO
12.5-14.5 mass % and
CaO/MgO
(mass ratio) = 1.7-2.2.
14 . The glass plate according to claim 12 , which comprises SrO or BaO instead of CaO.
15 . The glass plate according to claim 12 , which comprises SrO or BaO instead of MgO.
16 . The glass plate according to claim 12 , which has at least one member selected from the group consisting of Fe 2 O 3 , CoO, Se, NiO, Cr 2 O 3 , MnO, V 2 O 5 , TiO 2 , CeO 2 , SnO, ZnO and SO 3 added thereto.
17 . The glass plate according to claim 12 , which has a thickness of from 2 to 3 mm.
18 . The glass plate according to claim 12 , which is obtained by a float process.
19 . The glass plate according to claim 12 , which is used as a window glass for automobiles.Cited by (0)
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