Forsterite glass-ceramics of high crystallinity and chrome content
AssigneeCorning Incorporated
InventorsGeorge H. Beall, Joseph E. Pierson, Linda R. Pinckney
Life of this patent
Estimating the term…
Abstract
A composition for a glass-ceramic material that contains a crystallinity of at least about 30% by weight of forsterite components at a liquidus temperature of about 1525° C. or below. The glass-ceramic has a composition, in weight percent on an oxide basis, consisting essentially of about: 40-60% SiO2; 10-25% Al2O3; 18-30% MgO; 3-10% Na2O; 0-10% K2O; >5-15% TiO2. The invention further comprises a method for achieving high crystalline yield at such a low liquidus with increased solubility of high levels of chromium ions. The glass-ceramics can be used in drawing optical fibers and as gain media in amplifier and laser devices for near infrared wavelengths.
Claims31
A transparent glass-ceramic containing a predominant crystal phase of forsterite, the glass-ceramic having a composition, in weight percent on an oxide basis, consisting essentially of about:
- 40-60% SiO2;
- 10-25% Al2O3;
- 18-30% MgO;
- 3-10% Na2O;
- 0-10% K2O;
- >5-15% TiO2;
- and
- said glass-ceramic has a crystallinity of at least about 30% by weight of forsterite components at a liquidus temperature of about 1525° C. or below.
A transparent glass-ceramic with a crystallinity of at least about 30% by weight of forsterite components at a liquidus temperature of about 1525° C. or below, having a composition, in weight percent on an oxide basis, consisting essentially of about:
- 43-55% SiO2;
- 11-16% Al2O3;
- 20-26% MgO;
- 3.5-6.5% Na2O;
- 3.0-8.0% K2O;
- 5.5-9.0% TiO2.
An optical element comprising:
- a transparent glass-ceramic containing a crystallinity of at least about 30% by weight of forsterite component at a liquidus temperature of about ≦1525° C.±5° C. or below, the glass-ceramic having a composition, in weight percent on an oxide basis, consisting essentially of about:
- 40-60% SiO2;
- 10-25% Al2O3;
- 18-30% MgO;
- 3-10% Na2O;
- 0-10% K2O;
- and >5-15% TiO2.
Dependencies are inferred from the claim text.