# US 11,897,808 B2 · Tunable glass compositions having improved mechanical durability

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- Number: US 11,897,808 B2
- Document ID: US11897808B2
- Status: Granted
- Kind: B2
- Application number: 17/412,502
- Filed: 2021-08-26
- Published: 2022-03-03
- Granted: 2024-02-13
- Earliest claimed: 2020-08-26
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Xiaoju Guo; Peter Joseph Lezzi; Jian Luo
- Web page: https://patentgrep.com/patent/US11897808B2

## CPC

- C03C 10/0054: {containing PbO, SnO2, B2O3}
- C03C 3/064: containing boron
- C03C 3/091: containing aluminium
- C03C 4/02: for coloured glass
- C03C 10/0027: {containing SiO2, Al2O3, Li2O as main constituents}
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- C03C 2204/04: Opaque glass, glaze or enamel
- 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 includes: greater than or equal to 24 mol % and less than or equal to 60 mol % SiO2; greater than or equal to 23 mol % and less than or equal to 35 mol % Al2O3; greater than or equal to 3.5 mol % and less than or equal to 35 mol % B2O3; greater than 0 mol % and less than or equal to 20 mol % Li2O; greater than or equal to 0 mol % and less than or equal to 10 mol % Na2O; and greater than or equal to 0 mol % and less than or equal to 3 mol % K2O. The sum of Li2O, Na2O, and K2O (i.e., R2O) in the glass composition may be greater than or equal to 12 mol % and less than or equal to 20 mol %.

## Claims

### Claim 1

A glass composition comprising:
greater than or equal to 24 mol % and less than or equal to 60 mol % SiO2;
greater than or equal to 23 mol % and less than or equal to 35 mol % Al2O3;
greater than or equal to 3.5 mol % and less than or equal to 35 mol % B2O3;
greater than 0 mol % and less than 19.99 mol % Li2O;
greater than 0 mol % and less than or equal to 10 mol % Na2O; and
greater than 0.01 mol % and less than or equal to 3 mol % K2O, wherein
R2O is greater than or equal to 12 mol % and less than or equal to 20 mol %, R2O being the sum of Li2O, Na2O, and K2O.

### Claim 2 (depends on 1)

The glass composition of claim 1, wherein Al2O3+B2O3 is greater than or equal to 28 mol % and less than or equal to 60 mol %.

### Claim 3 (depends on 1)

The glass composition of claim 1, wherein the glass composition comprises greater than or equal to 24 mol % and less than or equal to 34 mol % Al2O3.

### Claim 4 (depends on 1)

The glass composition of claim 1, wherein the glass composition comprises greater than or equal to 5 mol % and less than or equal to 30 mol % B2O3.

### Claim 5 (depends on 1)

The glass composition of claim 1, wherein Al2O3—R2O—RO is greater than or equal to −0.5 mol %.

### Claim 6 (depends on 1)

The glass composition of claim 1, wherein the glass composition comprises greater than or equal to 3 mol % and less than or equal to 18 mol % Li2O.

### Claim 7 (depends on 6)

The glass composition of claim 6, wherein the glass composition comprises greater than or equal to 3 mol % and less than or equal to 11 mol % Li2O.

### Claim 8 (depends on 6)

The glass composition of claim 6, wherein the glass composition comprises greater than or equal to 10 mol % and less than or equal to 18 mol % Li2O.

### Claim 9 (depends on 6)

The glass composition of claim 6, wherein the glass composition comprises:
greater than or equal to 25 mol % and less than or equal to 35 mol % Al2O3; and
greater than or equal to 3 mol % and less than or equal to 11 mol % Li2O.

### Claim 10 (depends on 6)

The glass composition of claim 6, wherein the glass composition comprises:
greater than or equal to 24 mol % and less than or equal to 30 mol % Al2O3; and
greater than or equal to 10 mol % and less than or equal to 18 mol % Li2O.

### Claim 11 (depends on 1)

The glass composition of claim 1, wherein R2O is greater than or equal to 12.5 mol % and less than or equal to 19 mol %.

### Claim 12 (depends on 1)

The glass composition of claim 1, wherein RO is greater than or equal to 0 mol % and less than or equal to 17.5 mol %, RO being the sum of MgO, CaO, SrO, BaO, and ZnO.

### Claim 13 (depends on 12)

The glass composition of claim 12, wherein RO is greater than 0 mol % and less than or equal to 15 mol %.

### Claim 14 (depends on 1)

The glass composition of claim 1, wherein the glass composition comprises greater than or equal to 0 mol % and less than or equal to 15 mol % MgO.

### Claim 15 (depends on 1)

The glass composition of claim 1, wherein Al2O3+B2O3-R2O—RO is greater than 2 mol %.

### Claim 16 (depends on 1)

The glass composition of claim 1, wherein the glass composition has a KIc fracture toughness as measured by a chevron notch short bar method greater than or equal to 0.75 MPa·m1/2.

### Claim 17 (depends on 1)

The glass composition of claim 1, wherein the glass composition has a Young's modulus greater than or equal to 70 MPa.

### Claim 18 (depends on 1)

The glass composition of claim 1, wherein a ratio of KIc fracture toughness to Young's modulus of the glass composition is greater than or equal to 0.0095 m1/2.

### Claim 19 (depends on 18)

The glass composition claim 18, wherein the ratio of KIc fracture toughness to Young's modulus of the glass composition is greater than or equal to 0.01 m1/2.

### Claim 20 (depends on 1)

The glass composition of claim 1, wherein the glass composition has a Poisson's ratio greater than or equal to 0.21.