White, opaque β-spodumene/rutile glass-ceramic articles and methods for making the same

US8664130B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• George Halsey Beall · Big Flats, US
• Marie Jacqueline Monique Comte · Fontenay-aux-Roses, FR
• George Owen Dale · Horseheads, US
• Linda Ruth Pinckney · Corning, US
• Charlene Marie Smith · Corning, US
• Ronald Leroy Stewart · Elmira, US
• Steven Alvin Tietje · Lindley, US

Key dates

• Filing date: Mar 15, 2013
• Grant date: Mar 4, 2014
• Expiry date: Mar 15, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/315
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit β-spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 62-75 Si O2; 10.5-17 Al2O3; 5-13 Li2O; 0-4 ZnO; 0-8 MgO; 2-5 TiO2; 0-4 B2O3; 0-5 Na2O; 0-4 K2O; 0-2 ZrO2; 0-7 P2O5; 0-0.3 Fe2O3; 0-2 MnOx; and 0.05-0.2 SnO2. Additionally, these glasses and glass-ceramics exhibit the following criteria: Furthermore, the glass-ceramics exhibit an opacity ≧about 85% over the wavelength range of 400-700 nm for an about 0.8 mm thickness and colors an observer angle of 10° and a CIE illuminant F02 determined with specular reflectance included of a* between −3 and +3, b* between −6 and +6, and L* between 88 and 97.