# US 11,078,105 B2 · Transparent ion-exchangeable silicate glasses with high fracture toughness

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- Number: US 11,078,105 B2
- Document ID: US11078105B2
- Status: Granted
- Kind: B2
- Application number: 16/136,537
- Filed: 2018-09-20
- Published: 2019-03-21
- Granted: 2021-08-03
- Earliest claimed: 2017-09-21
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Jian Luo; John Christopher Mauro
- Web page: https://patentgrep.com/patent/US11078105B2

## CPC

- C03C 3/095: containing rare earths
- C03C 3/062: with less than 40% silica by weight
- C03C 3/078: containing an oxide of a divalent metal, e.g. an oxide of zinc
- C03C 3/085: containing an oxide of a divalent metal
- C03C 3/097: containing phosphorus, niobium or tantalum
- 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

Provided herein are glass based articles comprising SiO2 in a range from about 20 mol % to about 80 mol %; Al2O3 in a range from about 2 mol % to about 60 mol %; MgO; Li2O; La2O3 in an amount greater than or equal to about 3 mol %; a sum of alkali metal oxides (R2O) is greater than or equal to about 6 mol %; and a sum of MgO and Al2O3 is greater than or equal to about 28 mol %, wherein the glass based article is free of B2O3.

## Claims

### Claim 1

A glass based article comprising:
SiO2 in a range from 20 mol % to 63 mol %;
Al2O3 in a range from 15 mol % to 60 mol %;
MgO;
Li2O;
La2O3 in an amount greater than or equal to 3 mol %;
a sum of alkali metal oxides (R2O) is greater than or equal to 6 mol %; and
a sum of MgO and Al2O3 is greater than or equal to 28 mol %,
wherein the glass based article is free of B2O3.

### Claim 2 (depends on 1)

The glass based article of claim 1, wherein MgO is in a range from 1 mol % to 42 mol %.

### Claim 3 (depends on 1)

The glass based article of claim 1, wherein the sum of R2O is in a range from 6 mol % to 15 mol %.

### Claim 4 (depends on 1)

The glass based article of claim 1, wherein La2O3 is in a range from 5 mol % to 15 mol %.

### Claim 5 (depends on 4)

The glass based article of claim 4, wherein MgO is in a range from 3 mol % to 32 mol %.

### Claim 6 (depends on 1)

The glass based article of claim 1, wherein La2O3 is in a range from 3 mol % to 18 mol %.

### Claim 7 (depends on 6)

The glass based article of claim 6, wherein MgO is in a range from 2 mol % to 37 mol %.

### Claim 8 (depends on 1)

The glass based article of claim 1, comprising:
MgO in the range of 1 mol % to 12 mol %;
La2O3 in the range of 3 mol % to 18 mol %; and
the sum of R2O is in a range from 6 mol % to 15 mol %.

### Claim 9 (depends on 8)

The glass based article of claim 8, comprising:
SiO2 in the range of 25 mol % to 63 mol %; and
Al2O3 in the range of 15 mol % to 50 mol %.

### Claim 10 (depends on 9)

The glass based article of claim 9, comprising:
SiO2 in the range of 30 mol % to 63 mol %; and
Al2O3 in the range of 15 mol % to 40 mol %.

### Claim 11 (depends on 1)

The glass based article of claim 1, comprising:
SiO2 in the range of 25 mol % to 63 mol %;
Al2O3 in the range of 15 mol % to 50 mol %;
MgO in the range of 2 mol % to 37 mol %;
La2O3 in the range of 3 mol % to 18 mol %; and
the sum of R2O is in a range from 6 mol % to 15 mol %.

### Claim 12 (depends on 1)

The glass base article of claim 1, comprising:
SiO2 in the range of 30 mol % to 63 mol %;
Al2O3 in the range of 15 mol % to 40 mol %;
MgO in the range of 3 mol % to 32 mol %;
La2O3 in the range of 5 mol % to 15 mol %; and
the sum of R2O is in a range from 6 mol % to 15 mol %.

### Claim 13 (depends on 1)

The glass based article of claim 1, wherein (i) a fracture toughness is at least 0.8 MPa*m0.5, (ii) a Young's modulus value is at least 90 GPa; and/or (iii) a stress optical coefficient (SOC) is not more than 3 Brewster.

### Claim 14 (depends on 1)

A consumer electronic product, comprising:
a housing comprising a front surface, a back surface and side surfaces;
electrical components at least partially within the housing, the electrical components comprising at least a controller, a memory, and a display, the display at or adjacent the front surface of the housing; and
a cover substrate disposed over the display,
wherein at least one of a portion of the housing or the cover substrate comprises the glass based article of claim 1.