White glass-ceramic substrates and articles including tetragonal zirconia crystalline phase, and method of manufacturing the same

US12006248B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• Carol A. Click · Perrysburg, US
• Qiang Fu · Beijing, CN
• Mathieu Hubert · Torino, IT
• Charlene Marie Smith · Corning, US
• Alana Marie Whittier · Riverside, US

Key dates

• Filing date: Jun 20, 2023
• Grant date: Jun 11, 2024
• Expiry date: Jun 20, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2204/04
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A glass-ceramic article comprises: a center-volume composition comprising (on an oxide basis): 55-75 mol % SiO2; 0.2-10 mol % Al2O3; 0-5 mol % B2O3; 15-30 mol % Li2O; 0-2 mol % Na2O; 0-2 mol % K2O; 0-5 mol % MgO; 0-2 mol % ZnO; 0.2-3.0 mol % P2O5; 0.1-10 mol % ZrO2; 0-4 mol % TiO2; and 0-1.0 mol % SnO2. Lithium disilicate and either β-spodumene or β-quartz are the two predominant crystalline phases (by weight) of the glass-ceramic article. The glass-ceramic article further comprises tetragonal ZrO2 as a crystalline phase. The composition of the glass-ceramic article from a primary surface into a thickness of the glass-ceramic article can comprise over 10 mol % Na2O (on an oxide basis), with the mole percentage of Na2O decreasing from the primary surface towards the center-volume. The glass-ceramic article exhibits a ring-on-ring load-to-failure of at least 120 kgf, when the thickness of the glass-ceramic article is 0.3 mm to 2.0 mm.