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

Patent metadata

Field	Value
Publication number	US-10611675-B2
Application number	US-201715794752-A
Country	US
Kind code	B2
Filing date	Oct 26, 2017
Priority date	May 13, 2014
Publication date	Apr 7, 2020
Grant date	Apr 7, 2020

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 comprising a composition, in mol %, comprising:
SiO 2 in the range from about 35% to 55%,
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 0% to about 20%,
Li 2 O in the range from 0% to about 20%,
P 2 O 5 in the range from 3% to about 8%,
less than about 1% TiO 2 , and
a rare earth oxide in the range from greater than 0% to about 6%.

2. The glass of claim 1 , 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 .

3. The glass of claim 1 , wherein the composition further comprises, in mol %:
SiO 2 in the range from about 40% to 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 0% to about 10%,
P 2 O 5 in the range from 3% 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 0% to about 4%,
wherein the composition comprises less than about 1% TiO 2 .

4. The glass of claim 1 , further comprising a compressive stress layer having a surface compressive stress in the range from about 200 MPa to about 600 MPa and a depth of layer in the range from about 50 μm to about 150 μm.

5. The glass of claim 1 , wherein the glass is a glass sheet having a thickness of less than about 5 mm.

6. The glass of claim 5 , wherein the glass sheet further comprises a compressive stress layer having a surface compressive stress in the range from about 200 MPa to about 600 MPa and a depth of layer in the range from about 50 μm to about 150 μm.

7. The glass of claim 1 , further comprising a rare earth oxide in the range from 0.1% to about 6%.

Assignees

• Corning Inc

Inventors

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

Classifications

• C03B32/02

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

• C03C4/18

  for ion-sensitive glass · CPC title

• C03C21/002

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

• C03C10/0018 Primary

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