# US 9,517,967 B2 · Ion exchangeable glass with high damage resistance

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 9,517,967 B2
- Document ID: US9517967B2
- Status: Granted
- Kind: B2
- Application number: 13/903,398
- Filed: 2013-05-28
- Published: 2014-04-17
- Granted: 2016-12-13
- Earliest claimed: 2012-05-31
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Matthew John Dejneka; Adam James Ellison; John Christopher Mauro
- Web page: https://patentgrep.com/patent/US9517967B2

## CPC

- C03C 3/093: containing zinc or zirconium
- C03C 3/091: containing aluminium
- C03C 4/18: for ion-sensitive glass
- C03C 21/00: Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C 21/002: {to perform ion-exchange between alkali ions (C03C21/005 takes precedence)}
- Y10T 428/315: Surface modified glass [e.g., tempered, strengthened, etc.]
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An ion exchangeable glass having a high degree of resistance to damage caused by abrasion, scratching, indentation, and the like. The glass comprises alumina, B2O3, and alkali metal oxides, and contains boron cations having three-fold coordination. The glass, when ion exchanged, has a Vickers crack initiation threshold of at least about 30 kilogram force.

## Claims

### Claim 1

A glass comprising:
a. at least about 50 mol % SiO2;
b. at least about 10 mol % R2O, wherein R2O comprises at least about 10 mol % Na2O;
c. from 12 mol % to about 22 mol % Al2O3, wherein −1.61 mol %≦Al2O3(mol %)−R2O(mol %)≧2 mol %;
d. from greater than 0 mol % up to 5 mol % B2O3, wherein B2O3(mol %)−(R2O(mol %)−Al2O3(mol %))≧4.5 mol %; and
e. at least 0.1 mol % of at least one of MgO and ZnO, wherein the glass is ion exchangeable.

### Claim 2 (depends on 1)

The glass of claim 1, wherein the glass comprises: at least about 50 mol % SiO2, from 12 mol % to about 22 mol % Al2O3; from about 4.5 mol % to 5 mol % B2O3; from about 10 mol % to about 20 mol % Na2O; from 0 mol % to about 5 mol % K2O; at least about 0.1 mol % of at least one of MgO, ZnO, or combinations thereof, wherein 0 mol %≦MgO≦6 and 0≦ZnO≦6 mol %; and, optionally, at least one of CaO, BaO, and SrO, wherein 0 mol %≦CaO+SrO+BaO≦2 mol %.

### Claim 3 (depends on 2)

The glass of claim 2, wherein the glass comprises from about 60 to 66 mol % SiO2.

### Claim 4 (depends on 1)

The glass of claim 1, wherein the glass comprises greater than 4.5 mol % B2O3 in which boron cations are three-fold coordinated.

### Claim 5 (depends on 1)

The glass of claim 1, wherein the glass is ion exchanged and has a layer under a compressive stress of at least about 600 MPa, the layer extending from a surface of the glass into the glass to a depth of layer of at least about 30 μm.

### Claim 6 (depends on 5)

The glass of claim 5, wherein the compressive stress is at least about 800 MPa.

### Claim 7 (depends on 5)

The glass of claim 5, wherein the glass has a Vickers crack initiation threshold of at least about 30 kgf.

### Claim 8

A glass comprising: at least about 50 mol % SiO2; at least about 10 mol % R2O, wherein R2O comprises at least about 10 mol % Na2O; from 12 mol % to about 22 mol % Al2O3; greater than about 2.5 mol % to 5 mol % B2O3; and at least 0.1 mol % of at least one of MgO and ZnO, wherein B2O3(mol %)−(R2O(mol %)−Al2O3(mol %))≧4.5 mol %, wherein the glass has a zircon breakdown temperature at which the viscosity of the glass is greater than about 40 kPoise.

### Claim 9 (depends on 8)

The glass of claim 8, wherein the glass comprises: at least about 50 mol % SiO2, from 12 mol % to about 22 mol % Al2O3; from about 4.5 mol % to 5 mol % B2O3; from about 10 mol % to about 20 mol % Na2O; from 0 mol % to about 5 mol % K2O; at least about 0.1 mol % of at least one of MgO and ZnO, wherein 0 mol %≦MgO≦6 and 0≦ZnO≦6 mol %; and, optionally, at least one of CaO, BaO, and SrO, wherein 0 mol %≦CaO+SrO+BaO≦2 mol %.

### Claim 10 (depends on 9)

The glass of claim 9, wherein the glass comprises from about 60 to about 66 mol % SiO2.

### Claim 11 (depends on 8)

The glass of claim 8, wherein the glass comprises greater than about 4.5 mol % B2O3 in which boron cations are three-fold coordinated.

### Claim 12 (depends on 9)

The glass of claim 9, wherein the glass is ion exchanged and has a layer under a compressive stress of at least about 600 MPa, the layer extending from a surface of the glass into the glass to a depth of layer of at least about 30 μm.

### Claim 13 (depends on 12)

The glass of claim 12, wherein the compressive stress is at least about 800 MPa.

### Claim 14 (depends on 12)

The glass of claim 12, wherein the glass has a Vickers crack initiation threshold of at least about 30 kgf.

### Claim 15

A glass, wherein the glass is ion exchanged and has a Vickers crack initiation threshold of at least about 30 kgf, the glass comprising:
a. at least about 60 mol % SiO2;
b. at least about 10 mol % R2O, wherein R2O comprises at least about 10 mol % Na2O;
c. from 12 mol % to about 22 mol % Al2O3, wherein −1.61 mol %≦Al2O3(mol %)−R2O(mol %)≦2 mol %;
d. from greater than 0 mol % up to 5 mol % B2O3, wherein B2O3(mol %)−(R2O(mol %)−Al2O3(mol %))≧4.5 mol %; and
e. at least 0.1 mol % of at least one of MgO and ZnO, wherein the glass is ion exchangeable.

### Claim 16 (depends on 15)

The glass of claim 15, wherein the glass comprises: at least about 50 mol % SiO2, from 12 mol % to about 22 mol % Al2O3; from about 4.5 mol % to 5 mol % B2O3; from about 10 mol % to about 20 mol % Na2O; from 0 mol % to about 5 mol % K2O; at least about 0.1 mol % of at least one of MgO and ZnO, wherein 0 mol %≦MgO≦6 and 0≦ZnO≦6 mol %; and, optionally, at least one of CaO, BaO, and SrO, wherein 0 mol %≦CaO+SrO+BaO≦2 mol %.

### Claim 17 (depends on 16)

The glass of claim 16, wherein the glass comprises from about 60 to about 66 mol % SiO2.

### Claim 18 (depends on 15)

The glass of claim 15, wherein the glass comprises greater than about 4.5 mol % B2O3 in which boron cations are three-fold coordinated.

### Claim 19 (depends on 15)

The glass of claim 15, wherein the glass has a layer under a compressive stress of at least about 600 MPa, the layer extending from a surface of the glass into the glass to a depth of layer of at least about 30 μm.

### Claim 20 (depends on 19)

The glass of claim 19, wherein the compressive stress is at least about 800 MPa.

### Claim 21 (depends on 15)

The glass of claim 15, wherein the Vickers crack initiation threshold is in a range from about 30 kgf to about 35 kgf.