Sealing glass and use thereof

Patent metadata

Field	Value
Publication number	US-11964909-B2
Application number	US-202117218592-A
Country	US
Kind code	B2
Filing date	Mar 31, 2021
Priority date	Mar 31, 2020
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A sealing glass is provided that includes SiO 2 , Al 2 O 3 having a content of less than 2% by weight, is free of PbO except for unavoidable impurities, a coefficient of linear thermal expansion (α 20-300 ) of more than 10*10 −6 /K, a dielectric constant (ε r ) in the range from at least 7.10 to not more than 7.80 at a measurement frequency of 1 MHz and a temperature of 25° C., and a glass transition temperature (T g ) in a range from 400 to 550° C.

First claim

What is claimed is:

1. A sealing glass comprising:
SiO 2 having a content of at least 45% by weight;
Al 2 O 3 having a content of less than 2% by weight;
Na 2 O having a content of not more than 5% by weight;
free of PbO except for unavoidable impurities;
Li 2 O in a content of greater than 0% by weight;
K 2 O in a content of at least 5% by weight;
a coefficient of linear thermal expansion (α 20-300 ) of more than 10*10 −6 /K;
a dielectric constant (ε r ) in the range from at least 7.10 to not more than 7.80 at a measurement frequency of 1 MHz and a temperature of 25° C.; and
a glass transition temperature (T g ) in a range from 400 to 550° C.

2. The sealing glass of claim 1 , wherein the glass transition temperature (T g ) is in a range of 450° C. to 500° C.

3. The sealing glass of claim 1 , wherein the SiO 2 has a content of at least 45% by weight and not more than 75% by weight.

4. A sealing glass comprising:
SiO 2 having a content of at least 45% by weight;
Al 2 O 3 having a content of less than 2% by weight;
Na 2 O having a content of not more than 5% by weight;
free of PbO except for unavoidable impurities;
a coefficient of linear thermal expansion (α 20-300 ) of more than 10*10 −6 /K;
a dielectric constant (ε r ) in the range from at least 7.10 to not more than 7.80 at a measurement frequency of 1 MHz and a temperature of 25° C.;
a glass transition temperature (T g ) in a range from 400 to 550° C.; and
a content of B 2 O 3 of at least 2% by weight and not more than 20% by weight.

5. The sealing glass of claim 1 , further comprising alkali metal oxides having a total content that is at least 10% by weight and not more than 40% by weight and Na 2 O having a content that is not more than 500 ppm.

6. The sealing glass of claim 1 , wherein the Li 2 O has a content of 0% to not more than 10% by weight.

7. The sealing glass of claim 1 , wherein the K 2 O has a content of at least 5% by weight of and not more than 40% by weight.

8. The sealing glass of claim 1 , comprising two different alkaline earth metal oxides.

9. The sealing glass of claim 1 , comprising two different oxides that act as glass network transformers.

10. The sealing glass of claim 9 , wherein the two different oxides are CaO and ZnO.

11. A sealing glass comprising:
SiO 2 having a content of at least 45% by weight;
Al 2 O 3 having a content of less than 2% by weight;
Na 2 O having a content of not more than 5% by weight;
free of PbO except for unavoidable impurities;
a coefficient of linear thermal expansion (α 20-300 ) of more than 10*10 −6 /K;
a dielectric constant (ε r ) in the range from at least 7.10 to not more than 7.80 at a measurement frequency of 1 MHz and a temperature of 25° C.;
a glass transition temperature (T g ) in a range from 400 to 550° C.;
CaO having a content of greater than 0% by weight to not more than 15% by weight; and
ZnO having a content of greater than 0% by weight to not more than 8% by weight.

12. The sealing glass of claim 1 , further comprising ZnO having a content of 0% by weight to not more than 8% by weight.

13. The sealing glass of claim 1 , further comprising a stability of the dielectric constant, determined by a ratio of

C

C
0

where C 0 is a capacitance in an initial state and C is the capacitance after a thermal stressing,
where the ratio is less than 2 determined for the thermal stressing at 85° C.

14. The sealing glass of claim 13 , wherein the thermal stressing takes place between 40 hours and 600 hours.

15. The sealing glass of claim 13 , wherein the ratio is less than less than 1.2.

16. The sealing glass of claim 1 , comprising in % by weight on an oxide basis:
SiO 2 from 45 to 75,
B 2 O 3 from 2 to 20,
Li 2 O from greater than 0 to 10,
K 2 O from 5 to 40,
CaO from 0 to 15,
BaO from 0 to 16,
ZnO from 0 to 8,
F from 0 to 10,
a sum of alkali metal oxides in a range from at least 10% by weight to not more than 40% by weight, and
not more than 500 ppm by weight of Na 2 O and PbO.

17. The sealing glass of claim 1 , comprising, in % by weight on an oxide basis:
SiO 2 from 50 to 63,
B 2 O 3 from 5 to 18,
Li 2 O from 1 to 10,
K 2 O from 12 to 20,
CaO from 1 to 15,
BaO from 0 to 5,
ZnO from 0 to 5,
F from 0 to 5,
a sum of alkali metal oxides in a range from at least 13% by weight to not more than 30% by weight, and
not more than 500 ppm by weight of Na 2 O and PbO.

18. The sealing glass of claim 1 , comprising in % by weight on an oxide basis:
SiO 2 from 50 to 72,
Al 2 O 3 from 0 to 2,
B 2 O 3 from 2 to 20,
Li 2 O from greater than 0 to 5,
K 2 O from 10 to 35,
CaO from 0 to 7,
BaO from 0 to 16,
ZnO from 0 to 5,
F from 0 to 8,
a sum of alkali metal oxides in a range from at least 15% by weight to not more than 35% by weight, and
not more than 500 ppm by weight of Na 2 O and PbO.

19. A sealing glass comprising:
SiO 2 having a content of at least 45% by weight;
Al 2 O 3 having a content of less than 2% by weight;
Na 2 O having a content of not more than 5% by weight;
glass network transformers comprising CaO and ZnO;
free of PbO except for unavoidable impurities;
a coefficient of linear thermal expansion (α 20-300 ) of more than 10*10 −6 /K; and
a dielectric constant (ε r ) in the range from at least 7.10 to not more than 7.80 at a measurement frequency of 1 MHz and a temperature of 25° C.

Assignees

• Schott Ag

Inventors

• Schreder Bianca
• Wölfel Ute
• Hansen Stefanie

Classifications

• C03C8/06 Primary

  containing halogen · CPC title

• C03C3/118

  containing aluminium · CPC title

• C03C3/115 Primary

  containing boron · CPC title

• C03C3/089

  containing boron · CPC title

• C03C3/091

  containing aluminium · CPC title