Colored glass articles having improved mechanical durability

Patent metadata

Field	Value
Publication number	US-11834370-B2
Application number	US-202318093090-A
Country	US
Kind code	B2
Filing date	Jan 4, 2023
Priority date	Jun 18, 2021
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A glass composition includes greater than or equal to 50 mol % and less than or equal to 70 mol % SiO 2 ; greater than or equal to 10 mol % and less than or equal to 20 mol % Al 2 O 3 ; greater than or equal to 1 mol % and less than or equal to 10 mol % B 2 O 3 ; greater than or equal to 7 mol % and less than or equal to 14 mol % Li 2 O; greater than 0 mol % and less than or equal to 8 mol % Na 2 O; greater than 0 mol % and less than or equal to 1 mol % K 2 O; greater than or equal to 0 mol % and less than or equal to 7 mol % CaO; greater than or equal to 0 mol % and less than or equal to 8 mol % MgO; and greater than or equal to 0 mol % and less than or equal to 8 mol % ZnO. R 2 O+R′O is less than or equal to 25 mol %, wherein R 2 O is the sum of Li 2 O, Na 2 O, and K 2 O and R′O is the sum of CaO, MgO, and ZnO. The glass composition includes at least one of NiO+Co 3 O 4 +Cr 2 O 3 +CuO is greater than or equal to 0.001 mol %, CeO 2 is greater than or equal to 0.1 mol %, and TiO 2 is greater than or equal to 0.1 mol %.

First claim

What is claimed is:

1. A colored glass back cover for an electronic device, comprising:
B 2 O 3 , Al 2 O 3 , Li 2 O, Na 2 O, K 2 O, MgO, and CaO in mol % amounts such that (3.802946+0.01747*B 2 O 3 +0.058769*Al 2 O 3 +0.080876*Li 2 O+0.148433*Na 2 O+0.153264*K 2 O+0.045179*MgO+0.080113*CaO) is less than or equal to 6.8 and greater than or equal to 5.7, and wherein a sum of (R 2 O+R′O) in mol % is less than or equal to 25 mol %, where R 2 O is a sum of alkali metal oxides Li 2 O, Na 2 O, and K 2 O in mol % of the glass of the colored glass back cover and R′O is a sum of ZnO and alkaline earth metal oxides CaO and MgO in mol %, thereby facilitating dielectric properties for use of the colored glass back cover in high frequency applications;
wherein the Al 2 O 3 is greater than or equal to 10 mol % and less than or equal to 20 mol %, and a difference of (R 2 O−Al 2 O 3 ) in mol % is greater than or equal to −8 mol % and less than or equal to 4 mol %, thereby controlling formation of non-bridging oxygen, wherein K IC fracture toughness of the glass of the colored glass back cover as measured by a chevron notch short bar method is greater than or equal to 0.7 MPa·m 1/2 ;
wherein the glass of the colored glass back cover further comprises transition metal oxides and/or rare earth oxides colorants of NiO, Co 3 O 4 , Cr 2 O 3 , CuO, CeO 2 , TiO 2 and/or combinations thereof such that a sum of (NiO+Co 3 O 4 +Cr 2 O 3 +CuO+CeO 2 +TiO 2 ) in mol % is greater than or equal to 0.001 mol % and less than or equal to 10 mol %, and the glass of the colored glass back cover falls within a CIELAB color space, as measured at an article thickness of 1.33 mm under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 65 and less than or equal to 98, absolute value of a* greater than or equal to 0.3, and absolute value of b* greater than or equal to 0.5; and
wherein the Na 2 O of the glass of the colored glass back cover is greater than 0 mol % and less than or equal to 8 mol %, and the K 2 O is greater than 0 mol % and less than or equal to 1 mol %, thereby facilitating ion-exchange, wherein the colored glass back cover has a depth of compression of 10 μm or greater, a surface compressive stress greater than or equal to 300 MPa, and a central tension greater than or equal to 40 MPa.

2. The colored glass back cover of claim 1 , wherein the depth of compression is greater than or equal to 0.15t and less than or equal to 0.3t, where “t” is a thickness of the colored glass back cover, and wherein the thickness is greater than or equal to 250 μm and less than or equal to 6 mm.

3. The colored glass back cover of claim 1 , wherein the sum of (R 2 O+R′O) in mol % is greater than or equal to 7 mol %, and wherein the R′O is greater than 4 mol % and less than or equal to 10 mol %.

4. The colored glass back cover of claim 1 , wherein (3.802946+0.01747*B 2 O 3 +0.058769*Al 2 O 3 +0.080876*Li 2 O+0.148433*Na 2 O+0.153264*K 2 O+0.045179*MgO+0.080113*CaO) is greater than 6.1.

5. The colored glass back cover of claim 1 , wherein the sum of (NiO+Co 3 O 4 +Cr 2 O 3 +CuO+CeO 2 +TiO 2 ) in mol % is greater than or equal to 0.001 mol % and less than or equal to 3 mol %.

6. The colored glass back cover of claim 1 , wherein the glass of the colored glass back cover falls within the CIELAB color space, as measured at an article thickness of 1.33 mm under F2 illumination and a 10° standard observer angle, of a* greater than or equal to −20 and less than or equal to 10, and b* greater than or equal to −15 and less than or equal to 15.

7. A colored glass back cover for an electronic device, comprising:
B 2 O 3 , Al 2 O 3 , Li 2 O, Na 2 O, K 2 O, MgO, and CaO in mol % amounts such that (3.802946+0.01747*B 2 O 3 +0.058769*Al 2 O 3 +0.080876*Li 2 O+0.148433*Na 2 O+0.153264*K 2 O+0.045179*MgO+0.080113*CaO) is less than or equal to 6.8 and greater than or equal to 5.7, and wherein a sum of (R 2 O+R′O) in mol % is less than or equal to 25 mol %, where R 2 O is a sum of alkali metal oxides Li 2 O, Na 2 O, and K 2 O in mol % of the glass of the colored glass back cover and R′O is a sum of ZnO and alkaline earth metal oxides CaO and MgO in mol %, thereby facilitating dielectric properties for use of the colored glass back cover in high frequency applications;
wherein the B 2 O 3 is greater than or equal to 1 mol % and less than or equal to 10 mol %, and a difference of (R 2 O−Al 2 O 3 ) in mol % is greater than or equal to −8 mol % and less than or equal to 4 mol %, thereby controlling formation of non-bridging oxygen, wherein K IC fracture toughness of the glass of the colored glass back cover as measured by a chevron notch short bar method is greater than or equal to 0.7 MPa·m 1/2 ;
wherein the glass of the colored glass back cover further comprises transition metal oxides and/or rare earth oxides colorants of NiO, Co 3 O 4 , Cr 2 O 3 , CuO, CeO 2 , TiO 2 and/or combinations thereof such that a sum of (NiO+Co 3 O 4 +Cr 2 O 3 +CuO+CeO 2 +TiO 2 ) in mol % is greater than or equal to 0.001 mol % and less than or equal to 10 mol %, and the glass of the colored glass back cover falls within a CIELAB color space, as measured at an article thickness of 1.33 mm under F2 illumination and a 10° standard observer angle, of L* greater than or equal to 65 and less than or equal to 98, absolute value of a* greater than or equal to 0.3, and absolute value of b* greater than or equal to 0.5; and
wherein the Na 2 O of the glass of the colored glass back cover is greater than 0 mol % and less than or equal to 8 mol %, and the K 2 O is greater than 0 mol % and less than or equal to 1 mol %, thereby facilitating ion-exchange, wherein the colored glass back cover has a depth of compression of 10 μm or greater, a surface compressive stress greater than or equal to 300 MPa, and a central tension greater than or equal to 40 MPa.

8. The colored glass back cover of claim 7 , wherein the depth of compression is greater than or equal to 0.15t and less than or equal to 0.3t, where “t” is a thickness of the colored glass back cover, and wherein the thickness is greater than or equal to 250 μm and less than or equal to 6 mm.

9. The colored glass back cover of claim 7 , wherein the sum of (R 2 O+R′O) in mol % is greater than or equal to 7 mol %, and wherein the R′O is greater than 4 mol % and less than or equal to 10 mol %.

10. The colored glass back cover of claim 7 , wherein (3.802946+0.01747*B 2 O 3 +0.058769*Al 2 O 3 +0.080876*Li 2 O+0.148433*Na 2 O+0.153264*K 2 O+0.045179*MgO+0.080113*CaO) is greater than 6.1.

11. The colored glass back cover of claim 7 , wherein the sum of (NiO+Co 3 O 4 +Cr 2 O 3 +CuO+CeO 2 +TiO 2 ) in mol % is greater than or equal to 0.001 mol % and less than or equal to 3 mol %.

12. The colored glass back cover of claim 7 , wherein the glass of the colored glass back cover falls within the CIELAB color space, as measured at an article thickness of 1.33 mm under F2 illumination and a 10° standard observer angle, of a* greater than or equal to −20 and less than or equal to 10, and b* greater than or equal to −15 and less than or equal to 15.

13. A colored glass back cover for an electronic device, comprising:
B 2 O 3 , Al 2 O 3 , Li 2 O, Na 2 O, K 2 O, MgO, and CaO in mol % amounts such that (3.802946+0.01747*B 2 O 3 +0.058769*Al 2 O 3 +0.080876*Li 2 O+0.148433*Na 2 O+0.153264*K 2 O+0.045179*MgO+0.080113*CaO) is less than or equal to 6.8 and greater than or equal to 5.7, and wherein a sum of (R 2 O+R′O) in mol % is less than or equal to 25 mol %, where R 2 O is a sum of alkali metal oxides Li 2 O, Na 2 O, and K 2 O in mol % of the glass of the colored glass back cover and R′O is a sum of ZnO and alkal

Assignees

• Corning Inc

Inventors

• Guo Xiaoju
• Koch Iii Karl William
• Smith Liping Xiong
• Wiles Nicole Taylor

Classifications

• C03C4/02 Primary

  for coloured glass · CPC title

• C03C3/091 Primary

  containing aluminium · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title

• C03C3/095 Primary

  containing rare earths · CPC title

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title