Colored glass articles having improved mechanical durability

1. A glass composition comprising:

greater than or equal to 40 mol % and less than or equal to 70 mol % SiO 2 ;

greater than or equal to 8 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 1 mol % and less than or equal to 20 mol % Li 2 O;

greater than or equal to 1 mol % and less than or equal to 15 mol % Na 2 O;

greater than or equal to 0 mol % and less than or equal to 6 mol % MgO;

greater than or equal to 0 mol % and less than or equal to 5 mol % ZnO; and

A greater than or equal to 1×10 −6 mol % and less than or equal to 1 mol % Au, wherein:

MgO+ZnO is greater than or equal to 0.1 mol % and less than or equal to 6 mol %.

2. The glass composition of claim 1 , wherein the glass composition comprises greater than or equal to 0.1 mol % and less than or equal to 5 mol % MgO.

3. The glass composition of claim 1 , wherein the glass composition comprises greater than or equal to 1×10 −6 mol % and less than or equal to 0.01 mol % Au.

4. The glass composition of claim 1 , wherein the glass composition comprises greater than or equal to 0.1 mol % and less than or equal to 2 mol % ZrO 2 .

5. The glass composition of claim 1 , wherein the glass composition comprises greater than or equal to 0.01 mol % and less than or equal to 1 mol % SnO 2 .

6. The glass composition of claim 1 , wherein the glass composition comprises greater than or equal to 0.1 mol % and less than or equal to 1 mol % K 2 O.

7. The glass composition of claim 1 , wherein MgO+ZnO is greater than or equal to 0.5 mol % and less than or equal to 5.5 mol %.

8. The glass composition of claim 1 , wherein R 2 O is greater than or equal to 2 mol % and less than or equal to 35 mol %, wherein R 2 O is the sum of Li 2 O, Na 2 O, and K 2 O.

9. The glass composition of claim 1 , wherein R 2 O—Al 2 O 3 is greater than or equal to −3 mol % and less than or equal to 2 mol %.

10. The glass composition of claim 1 , wherein 5.72*Al 2 O 3 (mol %)-21.4*ZnO (mol %)-2.5*P 2 O 5 (mol %)-35*Li 2 O (mol %)-16.6*B 2 O 3 (mol %)-20.5*MgO (mol %)-23.3*Na 2 O (mol %)-27.9*SrO (mol %)-18.5*K 2 O (mol %)-26.3*CaO (mol %) is greater than −609 mol %.

11. A colored glass article comprising:

greater than or equal to 40 mol % and less than or equal to 70 mol % SiO 2 ;

greater than or equal to 8 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 1 mol % and less than or equal to 20 mol % Li 2 O;

greater than or equal to 1 mol % and less than or equal to 15 mol % Na 2 O;

greater than or equal to 0 mol % and less than or equal to 6 mol % MgO;

greater than or equal to 0 mol % and less than or equal to 5 mol % ZnO; and

greater than or equal to 1×10 −6 mol % and less than or equal to 1 mol % Au, wherein:

MgO+ZnO is greater than or equal to 0.1 mol % and less than or equal to 6 mol %.

12. The colored glass article of claim 11 , wherein the colored glass article has a transmittance color coordinate in the 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;

a* greater than or equal to −10 and less than or equal to 25; and

b* greater than or equal to −20 and less than or equal to 5.

13. The colored glass article of claim 11 , wherein the colored glass article has a thickness greater than or equal to 250 μm and less than or equal to 6 mm.

14. A consumer electronic device, comprising:

a housing having a front surface, a back surface, and side surfaces; and

electrical components provided at least partially within the housing, the electrical components including at least a controller, a memory, and a display, the display being provided at or adjacent the front surface of the housing;

wherein the housing comprises the colored glass article of claim 11 .

15. The colored glass article of claim 11 , wherein the colored glass article is an ion-exchanged colored glass article.

16. The colored glass article of claim 15 , wherein the ion-exchanged colored glass article has a depth of compression 3 μm or greater.

17. The colored glass article of claim 15 , wherein the ion-exchanged colored glass article has a thickness “t” and a depth of compression greater than or equal to 0.15 t.

18. The colored glass article of claim 15 , wherein the ion-exchanged colored glass article has a surface compressive stress greater than or equal to 300 MPa.

19. The colored glass article of claim 15 , wherein the ion-exchanged colored glass article has a maximum central tension greater than or equal to 40 MPa.

20. A method of forming a colored glass article, the method comprising:

heat treating a glass composition to form a glass article, the glass composition comprising:

greater than or equal to 40 mol % and less than or equal to 70 mol % SiO 2 ;

greater than or equal to 8 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 1 mol % and less than or equal to 20 mol % Li 2 O;

greater than or equal to 1 mol % and less than or equal to 15 mol % Na 2 O;

greater than or equal to 0 mol % and less than or equal to 6 mol % MgO;

greater than or equal to 0 mol % and less than or equal to 5 mol % ZnO; and

greater than or equal to 1×10 −6 mol % and less than or equal to 1 mol % Au, wherein:

MgO+ZnO is greater than or equal to 0.1 mol % and less than or equal to 6 mol %; and

subjecting the glass article to a heat treatment cycle at a temperature greater than or equal to 500° C. and less than or equal to 800° C. and a duration greater than or equal to 0.25 hour and less than or equal to 24 hours to produced the colored glass article.