USRE49895EActiveUtility
Thermally tempered glass element and use thereof
Est. expiryNov 26, 2035(~9.4 yrs left)· nominal 20-yr term from priority
C03C 3/097C03B 32/02C03C 8/24C03C 3/087C03B 27/012C03C 17/02E06B 3/64C03C 3/093C03C 3/091C03B 27/00
73
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0
Cited by
30
References
36
Claims
Abstract
A thermally tempered glass element is provided made of glass with two opposite faces that are under compressive stress of at least 40 MPa. The glass has a working point at which the glass has a viscosity of 10 4 dPa·s of at most 1350° C. The glass has a viscosity versus temperature profile and a coefficient of thermal expansion versus temperature profile of the glass are such that a variable (750° C.-T 13 )/(CTE Liq -CTEs Sol ) has a value of at most 5*10 6 K 2 . The CTE Liq is a coefficient of linear thermal expansion of the glass above a glass transition temperature T g , the CTE Sol is a coefficient of linear thermal expansion of the glass in a temperature range from 20° C. to 300° C., and the T 13 is a temperature at which the glass has a viscosity of 10 13 dPa·s.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A thermally tempered glass element, comprising:
glass with two opposite faces that are under compressive stress of at least 40 MPa,
wherein the glass has a working point at which the glass has a viscosity of 10 4 dPa·s of at most 1350° C.,
wherein the glass has a viscosity versus temperature profile and a coefficient of thermal expansion versus temperature profile of the glass are such that a variable
(750° C.−T 13 )/(CTE Liq −CTE Sol )
has a value of at most 5*10 6 K 2 ,
wherein CTE Liq is a coefficient of linear thermal expansion of the glass above a glass transition temperature T g ,
wherein CTE Sol is a coefficient of linear thermal expansion of the glass in a temperature range from 20° C. to 300° C.,
wherein T 13 is a temperature at which the glass has a viscosity of 10 13 dPa·s, and
wherein the glass has a composition that is free of B 2 O 3 , and
wherein the glass has a chemical resistance H, S, L of at least 2, 3, 3 or better, the chemical resistance being defined as hydrolytic class H according to ISO 719, acid class S according to DIN 12116, and alkali class L according to ISO 695.
2. The glass element of claim 1 , wherein the coefficient of linear thermal expansion CTE Sol is in a range from 3.5*10 −6 K −1 to 6*10 −6 K −1 .
3. The glass element of claim 1 , wherein the coefficient of linear thermal expansion CTE Liq is in a range from 11*10 −6 K −1 to 45*10 −6 K −1 .
4. The glass element of claim 1 , wherein the glass has a density of at least 2.4 grams per cubic centimeter.
5. The glass element of claim 1 , further comprising a coating on at least one of the two opposite faces.
6. The glass element of claim 5 , wherein the coating is a glass flux-based coating.
7. The glass element of claim 5 , wherein the coating has a coefficient of thermal expansion, CTE Coat , is adapted to the coefficient of thermal expansion CTE Sol of the glass so that an absolute value of a difference of thermal expansion coefficients, |ΔCTE|=|CTE Sol −CTE Coat |, is not more than 1 ppm/K.
8. The glass element of claim 7 , wherein the difference is not more than 0.5 ppm/K.
9. The glass element of claim 7 , wherein the difference is not more than 0.3 ppm/K.
10. The glass element of claim 1 , further comprising a thickness between the two faces that is between greater than or equal to 2 mm and less than or equal to 5 mm.
11. The glass element of claim 1 , further comprising a thickness between the two faces that is between greater than or equal to 3 mm and less than or equal to 5 mm.
12. The glass element of claim 1 , wherein the composition, in percent by weight, comprises:
SiO 2
60-80,
Al 2 O 3
3-15,
Li 2 O
0-5,
Na 2 O
0-10,
K 2 O
0-6,
MgO
0-8,
CaO
0-10,
SrO
0-5,
TiO 2
0-5, and
ZrO 2
0-9.
13. The glass element of claim 12 , wherein the composition further comprises one or more elements selected from a group consisting of refining agents, coloring agents, trace impurities inevitably contained in raw materials, and any combinations thereof, and wherein the one or more elements amount to a total of less than 2 wt %.
14. The glass element of claim 1 , wherein the composition, in percent by weight, comprises:
SiO 2
63-75,
Al 2 O 3
8-21,
Li 2 O
0-5,
Na 2 O
0-14,
K 2 O
0-5,
MgO
0-12,
CaO
0-18,
SrO
0-5,
TiO 2
0-5, and
ZrO 2
0-9.
15. The glass element of claim 14 , wherein the composition further comprises one or more elements selected from a group consisting of refining agents, coloring agents, trace impurities inevitably contained in raw materials, and any combinations thereof, and wherein the one or more elements amount to a total of less than 2 wt %.
16. The glass element of claim 1 , wherein the composition, in percent by weight, comprises:
SiO 2
50-70,
Al 2 O 3
3-25,
Li 2 O
0-8,
Na 2 O
0-7,
K 2 O
0-5,
MgO
0-5,
CaO
0-7,
SrO
0-5,
ZnO
0-3,
TiO 2
0-5,
ZrO 2
0-5, and
P 2 O 5
0-5.
17. The glass element of claim 16 , wherein the composition further comprises one or more elements selected from a group consisting of refining agents, coloring agents, trace impurities inevitably contained in raw materials, and any combinations thereof, and wherein the one or more elements amount to a total of less than 2 wt %.
18. The glass element of claim 1 , wherein the glass with two opposite faces is configured for a use selected from a group consisting of a door of a cooking chamber, a door of an electric oven, a door of an electric oven having a pyrolysis function, a cooking surface, a cover for a heating element, a cooking surface, a frying surface, a cover for a heating radiator, a grilling surface, a fireplace window, a carrier sheet, a furnace lining, a solar device, a pharmaceutical device, a medical device, a furnace lining for chemical or physical coating processes, a chemically resistant laboratory equipment, a substrate for high temperature applications, a substrate for extreme low temperature applications, a combustion furnace window, a heat shield for hot environment, a cover for a radiator, an IR radiator, an IR radiator appliance, a reflector, a floodlight, a projector, a video projector, a photocopier, thermo-mechanical load device, a night vision device, a wafer substrate, UV protection substrate, a housing component, an electronic device housing, a cover glass, a mobile phone cover glass, a laptop computer cover glass, a scanner cover glass, a facade panel, a fire protection glazing, and a ballistic protection component.
19. A thermally tempered glass element, comprising:
glass with two opposite faces that are under compressive stress of at least 40 MPa, wherein the glass has a working point at which the glass has a viscosity of 10 4 dPa·s of at most 1350° C., wherein the glass has a viscosity versus temperature profile and a coefficient of thermal expansion versus temperature profile of the glass are such that a variable
(750° C.−T 13 )/(CTE Liq −CTE Sol )
has a value of at most 5*10 6 K 2 ,
wherein CTE Liq is a coefficient of linear thermal expansion of the glass above a glass transition temperature T g ,
wherein CTE Sol is a coefficient of linear thermal expansion of the glass in a temperature range from 20° C. to 300° C.,
wherein T 13 is a temperature at which the glass has a viscosity of 10 13 dPa·s, and
wherein the composition comprises B 2 O 3 , less than 70 wt.-% of SiO 2 , and is free of BaO.
20. The glass element as claimed in claim 19, wherein the glass has a chemical resistance H, S, L of at least 2, 3, 3 or better, the chemical resistance being defined as hydrolytic class H according to ISO 719, acid class S according to DIN 12116, and alkali class L according to ISO 695.
21. The glass element as claimed in claim 19, wherein the coefficient of linear thermal expansion CTE Sol is in a range from 3.5*10 −6 K −1 to 6*10 −6 K −1 .
22. The glass element as claimed in claim 19, wherein the coefficient of linear thermal expansion CTE Liq is in a range from 11*10 −6 K −1 to 45*10 −6 K −1 .
23. The glass element as claimed in claim 19, wherein the glass has a density of at least 2.4 grams per cubic centimeter.
24. The glass element as claimed in claim 19, further comprising a coating on at least one of the two opposite faces.
25. The glass element as claimed in claim 24, wherein the coating is a glass flux-based coating.
26. The glass element as claimed in claim 24, wherein the coating has a coefficient of thermal expansion, CTE Coat , is adapted to the coefficient of thermal expansion CTE Sol of of the glass so that an absolute value of a difference of thermal expansion coefficients, |ΔCTE|=|CTE Sol −CTE Coat |, is not more than 1 ppm/K.
27. The glass element as claimed in claim 26, wherein the difference is not more than 0.5 ppm/K.
28. The glass element as claimed in claim 26, wherein the difference is not more than 0.3 ppm/K.
29. The glass element as claimed in claim 19, further comprising a thickness between the two faces that is between greater than or equal to 2 mm and less than or equal to 5 mm.
30. The glass element as claimed in claim 19, further comprising a thickness between the two faces that is between greater than or equal to 3 mm and less than or equal to 5 mm.
31. The glass element as claimed in claim 19, wherein the glass has a content of Al 2 O 3 being in the range of from 3 to 25 wt %.
32. The glass element as claimed in claim 19, wherein the glass has a composition, in percent by weight, comprising:
SiO 2 60 to less than 70, B 2 O 3 4-15, Al 2 O 3 3-15, Li 2 O 0-5, Na 2 O 0-10, K 2 O 0-6, MgO 0-8, CaO 0-10, SrO 0-5, TiO 2 0-5, and ZrO 2 0-9.
33. The glass element as claimed in claim 32, wherein the composition further comprises one or more elements selected from the group consisting of refining agents, coloring agents, trace impurities inevitably contained in raw materials, and any combinations thereof, and wherein the one or more elements amount to a total of less than 2 wt %.
34. The glass element as claimed in claim 19, wherein the glass has a composition, in percent by weight, comprising:
SiO 2 50 to less than 70, B 2 O 3 from greater than 0 to 8, Al 2 O 3 3-25, Li 2 O 0-8, Na 2 O 0-7, K 2 O 0-5, MgO 0-5, CaO 0-7, SrO 0-5, ZnO 0-3, TiO 2 0-5, ZrO 2 0-5, and P 2 O 5 0-5.
35. The glass element as claimed in claim 34, wherein the composition further comprises one or more elements selected from the group consisting of refining agents, coloring agents, trace impurities inevitably contained in raw materials, and any combinations thereof, and wherein the one or more elements amount to a total of less than 2 wt %.
36. The glass element as claimed in claim 19, wherein the glass with two opposite faces is configured for a use selected from the group consisting of a door of a cooking chamber, a door of an electric oven, a door of an electric oven having a pyrolysis function, a cooking surface, a cover for a heating element, a cooking surface, a frying surface, a cover for a heating radiator, a grilling surface, a fireplace window, a carrier sheet, a furnace lining, a solar device, a pharmaceutical device, a medical device, a furnace lining for chemical or physical coating processes, a chemically resistant laboratory equipment, a substrate for high temperature applications, a substrate for extreme low temperature applications, a combustion furnace window, a heat shield for hot environment, a cover for a radiator, an IR radiator, an IR radiator appliance, a reflector, a floodlight, a projector, a video projector, a photocopier, thermo-mechanical load device, a night vision device, a wafer substrate, UV protection substrate, a housing component, an electronic device housing, a cover glass, a mobile phone cover glass, a laptop computer cover glass, a scanner cover glass, a facade panel, a fire protection glazing, and a ballistic protection component.Cited by (0)
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