White, opaque, β-spodumene glass-ceramic articles with inherent damage resistance and methods for making the same

US10781131B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• George Halsey Beall · Big Flats, US
• Qiang Fu · Beijing, CN
• Charlene Marie Smith · Corning, US
• Randall Eugene Youngman · Horseheads, US

Key dates

• Filing date: Jan 25, 2019
• Grant date: Sep 22, 2020
• Expiry date: Jan 25, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2204/00
• 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: 60-75 SiO2; 10-18 Al2O3; 5-14 Li2O; and 4.5 B2O3. The glass-ceramics also have a Vickers initiation crack threshold of at least about 25 kgf.