# US 8,541,327 B1 · Barium oxide, calcium oxide, magnesia, and alkali oxide free glass

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- Number: US 8,541,327 B1
- Document ID: US8541327B1
- Status: Granted
- Kind: B1
- Application number: 13/278,438
- Filed: 2011-10-21
- Granted: 2013-09-24
- Earliest claimed: 2011-10-21
- Assignees: U.S. Department of Energy
- Applicants: Peizhen Kathy Lu; Manoj Kumar Mahapatra
- Inventors: Peizhen Kathy Lu; Manoj Kumar Mahapatra
- Web page: https://patentgrep.com/patent/US8541327B1

## CPC

- C03C 3/068: containing rare earths
- C03C 3/095: containing rare earths
- C03C 8/24: 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
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

A glass composition consisting essentially of about 10-45 mole percent of SrO; about 35-75 mole percent SiO2; one or more compounds from the group of compounds consisting of La2O3, Al2O3, B2O3, and Ni; the La2O3 less than about 20 mole percent; the Al2O3 less than about 25 mole percent; the B2O3 less than about 15 mole percent; and the Ni less than about 5 mole percent. Preferably, the glass is substantially free of barium oxide, calcium oxide, magnesia, and alkali oxide. Preferably, the glass is used as a seal in a solid oxide fuel/electrolyzer cell (SOFC) stack. The SOFC stack comprises a plurality of SOFCs connected by one or more interconnect and manifold materials and sealed by the glass. Preferably, each SOFC comprises an anode, a cathode, and a solid electrolyte.

## Claims

### Claim 1

A glass composition consisting essentially of:
a. about 28-30 mole percent of SrO;
b. about 35-75 mole percent SiO2;
c. a plurality of compounds from the group of compounds consisting of La2O3, Al2O3, B2O3, and Ni;
d. said La2O3 less than about 20 mole percent;
e. said Al2O3 less than about 25 mole percent;
f. said B2O3 less than about 15 mole percent; and
g. said Ni less than about 5 mole percent.

### Claim 2 (depends on 1)

The glass composition of claim 1 further consisting essentially of:
a. at least some La2O3; and
b. at least some Al2O3.

### Claim 3 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 28-30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 0-10 mole percent B2O3;
e. about 50-60 mole percent SiO2; and
f. about 0-2 mole percent Ni.

### Claim 4 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 0-10 mole percent B2O3;
e. about 50-60 mole percent SiO2; and
f. about 2 mole percent Ni.

### Claim 5 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 0-10 mole percent B2O3; and
e. about 55-60 mole percent SiO2.

### Claim 6 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 28-30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 58-60 mole percent SiO2; and
e. about 0-2 mole percent Ni.

### Claim 7 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 28-30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 58-60 mole percent SiO2; and
e. about 2 mole percent Ni.

### Claim 8 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 10 mole percent B2O3; and
e. about 50 mole percent SiO2.

### Claim 9 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 5 mole percent B2O3; and
e. about 55 mole percent SiO2.

### Claim 10 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3; and
d. about 60 mole percent SiO2.

### Claim 11 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 5 mole percent B2O3;
e. about 53 mole percent SiO2; and
f. about 2 mole percent Ni.

### Claim 12 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 3 mole percent B2O3;
e. about 55 mole percent SiO2; and
f. about 2 mole percent Ni.

### Claim 13 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 30 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 58 mole percent SiO2; and
e. about 2 mole percent Ni.

### Claim 14 (depends on 1)

The glass composition of claim 1 consisting essentially of:
a. about 28 mole percent of SrO;
b. about 5 mole percent La2O3;
c. about 5 mole percent Al2O3;
d. about 60 mole percent SiO2; and
e. about 2 mole percent Ni.