High-expansion bonding glass having improved water resistance and uses thereof

Patent metadata

Field	Value
Publication number	US-10654745-B2
Application number	US-201816117842-A
Country	US
Kind code	B2
Filing date	Aug 30, 2018
Priority date	Sep 15, 2017
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

The present disclosure relates to a bonding glass which has improved water resistance and has a coefficient of thermal expansion α(25-300) of from 14·10−6K−1 to 17·10−6K−1, comprising, in mol % on an oxide basis, 5-7 of B2O3, 10-14 of Al2O3, 36-43 of P2O5, 15-22 of Na2O, 12.5-20 of K2O, 2-6 of Bi2O3 and >0-6 of R oxide, where R oxide is an oxide selected from the group consisting of MnO2 and SiO2 and SnO2 and Ta2O5 and Nb2O5 and Fe2O3 and GeO2 and CaO. The bonding glass is free of PbO except for, at most, impurities. The bonding glass may have a glass transition temperature Tg of from 390° C. to 430° C. The present disclosure also relates to uses of this bonding glass.

First claim

What is claimed is:

1. A bonding glass which has a coefficient of thermal expansion α(25-300) of from 14·10 −6 K −1 to 17·10 −6 K −1 , comprising a composition in mol % on an oxide basis of:

B 2 O 3
4-8;

Al 2 O 3
10-14;

P 2 O 5
36-43;

Na 2 O
15-22;

K 2 O
12.5-20;  

Bi 2 O 3
2-6; and

R oxide
>0-6, 

wherein R oxide is an oxide selected from the group consisting of MnO 2 , SiO 2 , SnO 2 , Ta 2 O 5 , Nb 2 O 5 , Fe 2 O 3 , GeO 2 , CaO, and combinations thereof, the composition being free of PbO except for, at most, impurities.

2. The bonding glass according to claim 1 , wherein the bonding glass has a glass transition temperature Tg of from 390° C. to 430° C.

3. The bonding glass according to claim 1 , wherein R oxide comprises, in mol % on an oxide basis, 3.0-6.0 MnO 2 .

4. The bonding glass according to claim 3 , wherein R oxide comprises, in mol % on an oxide basis, 3.2-4.9 MnO 2.

5. The bonding glass according to claim 1 , wherein R oxide comprises, in mol % on an oxide basis, at least one of the following oxides:

SiO 2
0.01-1.8;

GeO 2
0.01-2.8;

SnO 2
0.01-2.4;

Fe 2 O 3
0.01-2.1;

Ta 2 O 5
0.01-2.2;

Nb 2 O 5
0.01-2.0; and

CaO
0.01-0.4.

6. The bonding glass according to claim 1 , wherein the composition comprises, in mol % on an oxide basis, at least one of the following oxides:

P 2 O 5
 36-<42;

B 2 O 3
5.5-6.8;

Al 2 O 3
11.4-12.8;

Na 2 O
15.4-20.9;

K 2 O
12.8-19.8; and

Bi 2 O 3
2.5-4.5.

7. The bonding glass according to claim 1 , wherein the composition comprises at least one additional alkali metal oxide, other than Na 2 O and K 2 O, and a total content of alkali metal oxides in the composition is at most 36 mol %.

8. The bonding glass according to claim 7 , wherein the at least one additional alkali metal oxide is selected from the group consisting of Li 2 O, Cs 2 O, and combinations thereof.

9. The bonding glass according to claim 1 , wherein the bonding glass has crystalline regions which comprise phosphate-containing crystal phases.

10. The bonding glass according to claim 9 , wherein the crystal phases comprise crystals from the group consisting of a Bi 2 O 3 —P 2 O 5 system, an R 2 O—Al 2 o 3 —P 2 O 5 system, and combinations thereof.

11. The bonding glass according to claim 10 , wherein the crystal phases comprise crystals from a K 2 O—Al 2 O 3 —P 2 O 5 system.

12. The bonding glass according to claim 1 , wherein the composition is in the form of a glass powder.

13. The bonding glass according to claim 1 , further comprising a metal bonded to the bonding glass to form a glass-metal composite.

14. The glass-metal composite according to claim 13 , wherein the metal is one of a lightweight metal and a lightweight metal alloy.

15. The glass-metal composite according to claim 13 , wherein the metal is selected from the group consisting of aluminum, aluminum alloys, titanium, titanium alloys, magnesium, magnesium alloys, AlSiC, steel, stainless steel, copper, copper alloys, and combinations thereof.

16. The glass-metal composite according to claim 13 , wherein the bonding glass is covered, at least in sections, by a covering glass or a covering polymer.

17. The glass-metal composite according to claim 16 , wherein the bonding glass is covered, at least in sections, by a covering glass having a higher water resistance than the bonding glass and comprising a titanate glass.

18. A device, comprising:
a feedthrough, comprising:
at least one main element composed of a metal and which has at least one opening formed therethrough;
a functional element passed through the at least one opening and embedded in a bonding glass in the at least one opening, the bonding glass seals the at least one opening, the bonding glass having a coefficient of thermal expansion α(25-300) of from 14·10 −6 K −1 to 17·10 −6 K −1 , the bonding glass comprising a composition in mol % on an oxide basis of:

B 2 O 3
4-8;

Al 2 O 3
10-14;

P 2 O 5
36-43;

Na 2 O
15-22;

K 2 O
12.5-20;  

Bi 2 O 3
2-6; and

R oxide
>0-6,

Assignees

• Schott Ag

Inventors

• Mitra Ina
• Kunze Miriam
• Bartelt Linda Johanna
• Wimmer Sabrina
• Kroll Frank
• Esemann Hauke
• Hoppe Bernd
• Witte Jörg

Classifications

• C03C3/253

  containing germanium · CPC title

• C03C8/24

  Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders · CPC title

• C03C27/02

  by fusing glass directly to metal · CPC title

• C03C8/08 Primary

  containing phosphorus · CPC title

• C03C3/066

  containing zinc · CPC title