Glasses and glass-ceramics with high E-moduli

US6184162A · kind A · utility

Assignee

• Schott Glas · DE

Inventors

• Burkhard Speit · Mainz, DE
• Silke Wolff · Hückeswagen, DE
• Peter Brix · Mainz, DE
• Monika Gierke · Wiesbaden, DE

Key dates

• Filing date: Aug 18, 1999
• Grant date: Feb 6, 2001
• Expiry date: Aug 18, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C3/068
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

High E-moduli glasses and glass-ceramics are disclosed based on the SiO.sub.2 --B.sub.2 O.sub.3 --RO--R.sub.2 O--ZrO.sub.2 --TiO.sub.2 --Nb.sub.2 O.sub.5 --La.sub.2 O.sub.3 system. The chemically pre-stressable glasses are lithium-poor or lithium-free. The glass-ceramics contain from 2 to 9 percent by weight lithium and the predominant crystalline phase is lithium titanate. These glasses and glass-ceramics particularly have a high specific E-modulus.