Ion exchangeable glass, glass ceramics and methods for making the same

Patent metadata

Field	Value
Publication number	US-10544059-B2
Application number	US-201715706044-A
Country	US
Kind code	B2
Filing date	Sep 15, 2017
Priority date	Aug 30, 2013
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

Glass-ceramics and precursor glasses that are crystallizable to glass-ceramics are disclosed. The glass-ceramics of one or more embodiments include rutile, anatase, armalcolite or a combination thereof as the predominant crystalline phase. Such glasses and glass-ceramics may include compositions of, in mole %: SiO2 in the range from about 45 to about 75; Al2O3 in the range from about 4 to about 25; P2O5 in the range from about 0 to about 10; MgO in the range from about 0 to about 8; R2O in the range from about 0 to about 33; ZnO in the range from about 0 to about 8; ZrO2 in the range from about 0 to about 4; B2O3 in the range from about 0 to about 12, and one or more nucleating agents in the range from about 0.5 to about 12. In some glass-ceramic articles, the total crystalline phase includes up to 20% by weight of the glass-ceramic article.

First claim

What is claimed is:

1. A glass-ceramic article comprising:
a predominant crystalline phase comprising anatase, rutile, or a combination thereof; and a composition, in mol %, comprising:
SiO 2 in the range from about 45 to about 75;
Al 2 O 3 in the range from about 4 to about 25;
P 2 O 5 in the range from about 0.1 to about 10;
MgO in the range from about 0 to about 4;
R 2 O in the range from about 0 to about 33;
ZnO in the range from about 0 to about 5;
ZrO 2 in the range from about 0 to about 4;
TiO 2 in the range from about 0.5 to about 10; and
B 2 O 3 in the range from about 0 to 4.44,
wherein R 2 O comprises one or more of Na 2 O, Li 2 O and K 2 O.

2. The glass-ceramic article of claim 1 , wherein (R 2 O—Al 2 O 3 ) is in the range from about −4 to about 4.

3. The glass-ceramic article of claim 1 , wherein the composition comprises, in mol %,
Li 2 O in the range from about 0 to about 12;
Na 2 O in the range from about 4 to about 20; and
K 2 O in the range from about 0 to about 2.

4. The glass-ceramic article of claim 1 , wherein the composition comprises, in mol %, B 2 O 3 in the range from about 2 to 4.41.

5. The glass-ceramic article of claim 1 further comprising a total crystalline phase of up to 20% by weight.

6. The glass-ceramic article of claim 1 , further comprising a compressive stress layer extending from a surface of the glass-ceramic article to a depth of the compressive stress layer, the compressive stress layer comprising a compressive stress of about 200 MPa or greater and the depth of compressive stress layer of about 15 μm or greater.

7. The glass-ceramic article of claim 6 , further exhibiting a Vickers indentation crack initiation load of about 10 kgf or greater.

8. A glass-ceramic article comprising:
a predominant crystalline phase comprising anatase, rutile, or a combination thereof,
wherein the glass-ceramic article is formed from a precursor glass having a liquidus viscosity of about 20 kP or greater.

9. The glass-ceramic article of claim 8 , wherein the predominant crystalline phase comprises crystals having a length of about 1 μm or less and a width of about 50 nm or less.

10. The glass-ceramic article of claim 8 , wherein the combined amount of anatase and rutile is less than about 12 wt. %, of the glass-ceramic article.

11. The glass-ceramic article of claim 8 , further comprising
a color presented in CIELAB color space coordinates determined from specular reflectance measurements selected from any one of:
CIE a* in the range from about −2 to about 8, CIE b* in the range from about −7 to about 30, and CIE L* in the range from about 85 to about 100; and
CIE a* in the range from about −1 to about 0, CIE b* in the range from about −7 to about −3, and CIE L* in the range from about 85 to about 100.

12. The glass-ceramic article of claim 8 , further exhibiting a Vickers indentation crack initiation load of about 10 kgf or greater.

13. An electronic or portable computing device comprising the glass-ceramic article of claim 1 .

14. An electronic or portable computing device comprising the glass-ceramic article of claim 8 .

Assignees

• Corning Inc

Inventors

• Dejneka Matthew John
• Fu Qiang
• Gross Timothy Michael
• Guo Xiaoju
• Likitvanichkul Sumalee
• Mauro John Christopher

Classifications

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title

• C03C4/005

  for opaline glass · CPC title

• C03C10/00

  Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition · CPC title

• C03C3/112

  containing fluorine · CPC title

• C03C21/002

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