Lithium containing aluminosilicate glass with low expansion after chemical toughening

US12006255B2 · kind B2 · utility

Assignee

• SCHOTT GLASS TECHNOLOGIES (SUZHOU) CO. LTD. · CN

Inventors

• Junming Xue · Suzhou, CN
• Feng He · Nanhu, CN
• Jose Zimmer · Ingelheim am Rhein, DE
• Ning Da · Suzhou, CN

Key dates

• Filing date: Aug 27, 2019
• Grant date: Jun 11, 2024
• Expiry date: Sep 17, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2203/50
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A chemically toughenable or toughened glass has, before chemical toughening, a thickness t of at most 1100 μm. The glass comprises the following components: 45-75 mol-% SiO2; 10-25 mol-% Al2O3; >1-11 mol-% Li2O; 0-15 mol-% P2O5; 0-8 mol-% B2O3; and 0-5 mol-% TiO2. The average number of bridging oxygen per polyhedron (BO) calculated as 2*4−2*(cmol(O)/(cmol(Si)+cmol(Al)+cmol(B)+cmol(P)+cmol(Ti))) is higher than 3.55. Upon chemical toughening, the linear dimension variation in the unit of percentage (V1) is so low that the overall geometry variation (OGV) calculated as (DoL/t)/V1 is higher than 0.8. DoL is the total depth of all ion-exchange layers on one side of the glass and DoL is more than 1 μm, when the glass is chemically toughened with NaNO3 only, KNO3 only or with both KNO3 and NaNO3.