Coated glasses with high effective fracture toughness

Patent metadata

Field	Value
Publication number	US-11613498-B2
Application number	US-202016991457-A
Country	US
Kind code	B2
Filing date	Aug 12, 2020
Priority date	Aug 12, 2019
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

Glass-based articles comprise high effective fracture toughness. Glass-based articles comprise: a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (ts), a substantially planar central portion, and a perimeter portion; a polymer coating disposed on at least a portion of at least one of the first or the second surfaces; and an effective fracture toughness that is greater than or equal to 1.25 MPa·m0.5 as measured at room temperature.

First claim

What is claimed is:

1. A glass-based article comprising:
a glass-based substrate comprising opposing first and second surfaces defining a substrate thickness (t s ), a substantially planar central portion, and a perimeter portion;
a polymer coating disposed on at least a portion of at least one of the first or the second surfaces; and
an effective fracture toughness that is greater than or equal to 1.25 MPa·m 0.5 as measured at room temperature.

2. The glass-based article of claim 1 , wherein the perimeter portion comprises finished edges.

3. The glass-based article of claim 1 , wherein an average thickness of the polymer coating (t c ) is greater than or equal to 5 micrometers and/or is less than or equal to 150 micrometers, and wherein t s is greater than or equal to 0.02 mm and less than or equal to 1.3 mm.

4. The glass-based article of claim 1 , wherein the polymer coating comprises a polymer comprising a first material index (MI 1 ) as defined by MI 1 =θ 0.5 σ y , wherein θ is elongation of the polymer in percentage and σ y is tensile strength of the polymer in MPa, where MI 1 is greater than or equal to 35 MPa and/or less than or equal to 100 MPa.

5. The glass-based article of claim 4 , wherein the polymer coating comprises a polymer comprising a second material index (MI 2 ) as defined by MI 2 =θσ y , wherein θ is elongation of the polymer in percentage and σ y is tensile strength of the polymer in MPa, where MI 2 is greater than or equal to 12 MPa and/or less than or equal to 75 MPa.

6. The glass-based article of claim 5 , wherein the polymer coating comprises a polymer comprising a third material index (MI 3 ) as defined by MI 3 =θσ y 2 /E, where θ is elongation, σ y is the tensile strength in MPa, and E is the Young's Modulus in GPa, the range of MI 3 being greater than or equal to 0.5 MPa and/or less than or equal to 5 MPa.

7. The glass-based article of claim 1 , wherein the polymer coating comprises a polymer selected from the group consisting of: polyimides, polyamides, polysulfones, polybenzimidazoles, silicones, epoxies, acrylates, and combinations thereof.

8. The glass-based article of claim 1 , wherein the glass-based substrate comprises in mole percent: greater than or equal to 55% to less than or equal to 70% SiO 2 , and greater than or equal to 10% to less than or equal to 20% Al 2 O 3 .

9. The glass-based article of claim 8 , wherein the glass-based substrate comprises in mole percent: 55 to 70% SiO 2 , 10 to 20% Al 2 O 3 , 0 to 7% P 2 O 5 , 0 to 20% Li 2 O, and 0 to 20% Na 2 O.

10. 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 disposed over the display;
wherein a portion of at least one of the housing and the cover comprises the glass-based article of claim 1 .

11. A process for making a glass-based article based in part on mechanical modeling, the glass-based article comprising an effective fracture toughness (K C ), the process comprising:
disposing a polymer precursor on at least a portion of at least one of first and second surfaces of a glass-based substrate that comprises: a substrate thickness (t s ) defined by the first and second surfaces, a glass composition-based fracture toughness (K g ), wherein the polymer precursor delivers a polymer comprising a tensile strength σ y in MPa; and
curing the polymer precursor to form a polymer coating comprising an average coating thickness (t c ) on the glass-based substrate to form a glass-based article;
wherein the K C is defined by:
K c =K g *(1+αβ 2 /γ) 0.5   (I),

wherein α is the ratio of coating thickness (t c ) to glass-based substrate thickness (t s ), β is the ratio of K m to K g , γ is the ratio of Young's Modulus of the polymer (E p ) to Young's Modulus of the glass (E g ), and K m is a value of greater than or equal to 0.45 MPa*m 0.5 to less than or equal to 10 MPa*m 0.5 .

12. The process of claim 11 , wherein the glass-based article comprises an effective fracture toughness that is greater than or equal to 1.25 MPa·m 0.5 as measured at room temperature, and wherein the average coating thickness (t c ) is greater than or equal to 5 micrometers and/or is less than or equal to 150 micrometers.

13. The process of claim 11 , wherein the polymer precursor delivers a polymer comprising a first material index (MI 1 ) as defined by MI 1 =θ 0.5 σ y , wherein θ is elongation and the σ y is the tensile strength in MPa, the range of MI 1 being greater than or equal to 35 MPa and/or less than or equal to 100 MPa.

14. The process of claim 13 , wherein the polymer precursor delivers a polymer comprising a second material index (MI 2 ) as defined by MI 2 =θσ y , wherein θ is elongation of the polymer in percentage and σ y is tensile strength of the polymer in MPa, where MI 2 is greater than or equal to 12 MPa and/or less than or equal to 75 MPa.

15. The process of claim 14 , wherein the polymer precursor delivers a polymer comprising a third material index (MI 3 ) as defined by MI 3 =θσ y 2 /E, where θ is elongation, σ y is the tensile strength in MPa, and E is the Young's Modulus in GPa, the range of MI 3 being greater than or equal to 0.5 MPa and/or less than or equal to 5 MPa.

16. A method of manufacturing a glass-based article comprising:
disposing a polymer precursor on at least a portion of at least one of first and second surfaces of a glass-based substrate that comprises: a substrate thickness (t s ) defined by the first and second surfaces, a substantially planar central portion, and a perimeter portion; and
curing the polymer precursor to form a polymer coating on the glass-based substrate to form a glass-based article comprising an effective fracture toughness that is greater than or equal to 1.25 MPa·m 0.5 as measured at room temperature.

17. The method of claim 16 , wherein the curing is conducted at a temperature of greater than or equal to 300° C., and wherein applying the polymer precursor comprises applying a solution comprising at least one monomer and at least one solvent.

18. The method of claim 16 , wherein applying the polymer coating comprises spreading by a doctor blade.

19. The method of claim 16 , wherein the polymer coating comprises a polymer selected from the group consisting of: polyimides, polyamides, polysulfones, polybenzimidazoles, silicones, epoxies, acrylates, and combinations thereof.

20. The method of one of claim 16 , wherein an average thickness of the polymer coating (t c ) is greater than or equal to 5 micrometers and/or is less than or equal to 150 micrometers.

Assignees

• Corning Inc

Inventors

• Gu Yunfeng
• Luo Jian
• Niu Weijun
• Zhang Rui

Classifications

• C03C2218/114

  by brushing, pouring or doctorblading · CPC title

• C03C2218/365

  Coating different sides of a glass substrate · CPC title

• C03C3/087 Primary

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• C03C2217/70

  Properties of coatings · CPC title

• C03C17/32 Primary

  with synthetic or natural resins (C03C17/30 takes precedence) · CPC title