Method of making forsterite glass-ceramics
AssigneeCorning Incorporated
InventorsGeorge H. Beall, Joseph E. Pierson, Linda R. Pinckney
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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.
Claims12
A method of dissolving at least 30% by weight of forsterite component in a glass-ceramic, the method comprising:
- providing a R2O—MgO—Al2O3—SiO2 glass composition, wherein R is an alkali ion, containing, in weight percent, at least about 3% of Na2O coupled with greater than 5% of TiO2;
- melting said glass at a temperature between about 1575° C. to about 1650° C.
Dependencies are inferred from the claim text.