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US 8,302,428 B2Granted
Extruded glass structures and methods for manufacturing the same
AssigneeCorning Incorporated
InventorsNicholas Francis Borrelli, David John McEnroe, Elizabeth Marie Vileno
Life of this patent
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Abstract
Methods for preparing glass structures include extruding a glass precursor, the glass precursor having a composition in the range of 55%-75% SiO2, 5%-10% Na2O, 20%-35% B2O3 and 0%-5% Al2O3, and heat treating and leaching the glass precursor to yield a glass article comprising at least about 90% SiO2 by weight. Glass articles can be used to manufacture a variety of geometrically complex structures.
Claims12
A method for preparing a glass article comprising:
- providing a glass precursor having a composition, expressed in terms of weight percentage on an oxide basis, consisting essentially of:
- 55%-75% SiO2;
- 5%-10% Na2O;
- 20%-35% B2O3;
- and
- 0%-5% Al2O3;
- melting the glass precursor;
- allowing the melted glass precursor to cool;
- reheating the cooled glass precursor to a temperature in a range from about 700° C. to about 900° C.;
- extruding the glass precursor;
- heat treating the glass precursor, thereby causing phase-separation in the glass precursor;
- and
- leaching the glass precursor to obtain a porous glass article comprising at least 90% by weight of silica.
10 more elements
A method for preparing a glass article comprising:
- providing a glass precursor having a composition, expressed in terms of weight percentage on an oxide basis, consisting essentially of:
- 55%-75% SiO2;
- 5%-10% Na2O;
- 20%-35% B2O3;
- and
- 0%-5% Al2O3;
- melting the glass precursor;
- allowing the melted glass precursor to cool;
- reheating the cooled glass precursor;
- extruding the glass precursor;
- heat treating the glass precursor at a temperature in a range from about 580° C. to about 650° C., thereby causing phase-separation in the glass precursor;
- etching the glass precursor to remove a silica rich skin of the glass precursor;
- and
- leaching the etched glass precursor to obtain a porous glass article comprising at least 90% by weight of silica.
11 more elements
Dependencies are inferred from the claim text.