Transparent glass-ceramic articles, glass-ceramic precursor glasses and methods for forming the same

Patent metadata

Field	Value
Publication number	US-9359243-B2
Application number	US-201514707127-A
Country	US
Kind code	B2
Filing date	May 8, 2015
Priority date	May 13, 2014
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Embodiments of glass ceramic articles and precursor glasses are disclosed. In one or more embodiments, the glass-ceramic articles are transparent and include a nepheline phase and a phosphate phase. The glass-ceramic articles are colorless and exhibit a transmittance of about 70% or greater across the visible spectrum. The glass-ceramic articles may optionally include a lithium aluminosilicate phase. The crystals of the glass-ceramic articles may have a major cross-section of about 100 nm or less.

First claim

What is claimed is:

1. A glass-ceramic article comprising:
a major nepheline crystalline phase; and
a minor phosphate crystalline phase,

wherein the glass-ceramic article is colorless and has transmission or reflection color coordinates under the CIE L*, a*, b* colorimetry system of L* in the range from about 80 to about 100, a* in the range from about −5 to about 5, and b* in the range from about b* in the range from about −5 to about 5, and exhibits a transmittance of about 70% or greater across the visible spectrum, in the range from about 390 nm to about 700 nm.

2. The glass-ceramic article of claim 1 , further comprising a lithium aluminosilicate phase.

3. The glass-ceramic article of claim 1 , wherein at least one of the nepheline phase and the phosphate phase comprises a plurality of nanocrystals having a major cross-sectional dimension of about 100 nm or less.

4. The glass-ceramic article of claim 3 , wherein the plurality of nanocrystals form at least one of the nepheline phase, the phosphate phase and the lithium aluminosilicate phase, and the plurality of nanocrystals have a major cross-sectional dimension of about 100 nm or less.

5. The glass-ceramic article of claim 4 , wherein the plurality of nanocrystals form the nepheline phase, the phosphate phase and the lithium aluminosilicate phase.

6. The glass-ceramic article of claim 1 , comprising a composition, in mol %, comprising:
SiO 2 in the range from about 35 to about 60,
Al 2 O 3 in the range from about 10 to about 30,
Na 2 O in the range from about 7 to about 31,
K 2 O in the range from about 0 to about 20,
Li 2 O in the range from about 0 to about 20,
P 2 O 5 in the range from about 1.5 to about 8, and
a rare earth oxide in the range from about 0 to about 6.

7. The glass-ceramic article of claim 6 , wherein the composition further comprises at least one oxide in an amount in the range from 0 mol % to about 8 mol %, wherein the at least one oxide comprises one of B 2 O 3 , MgO, CaO, SrO, BaO, and ZrO 2 .

8. The glass-ceramic article of claim 1 , wherein the composition further comprises, in mol %:
SiO 2 in the range from about 40 to about 55,
Al 2 O 3 in the range from about 14 to about 21,
Na 2 O in the range from about 13 to about 29,
K 2 O in the range from about 2 to about 14,
Li 2 O in the range from about 0 to about 10,
P 2 O5 in the range from about 2.5 to about 5, and
at least one of ZrO 2 , Y 2 O 3 and La 2 O 3 in an amount in the range from about 0 to about 4.

9. The glass-ceramic article of claim 6 , wherein the composition comprises less than about 1 mol % TiO 2 .

10. The glass-ceramic article of claim 1 , wherein the nepheline phase comprises a solid solution.

11. The glass-ceramic article of claim 1 , further comprising a compressive stress layer, the compressive stress layer optionally comprising kalsilite.

12. The glass-ceramic article of claim 1 , comprising an average surface compressive stress of about 400 MPa or greater.

Assignees

• Corning Inc

Inventors

• Beall George Halsey
• Smith Charlene Marie
• Tietjie Steven Alvin

Classifications

• C03C10/0018 Primary

  containing SiO2, Al2O3 and monovalent metal oxide as main constituents · CPC title

• C03C3/062 Primary

  with less than 40% silica by weight · CPC title

• C03C21/00

  Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface · CPC title

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title

• C03B32/02

  Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)} · CPC title