Lithium aluminosilicate glass with high modulus of elasticity, and method for producing same

US9096460B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Peter Brix · Mainz, DE
• Wolfram Beier · Essenheim, DE
• Jochen Alkemper · Klein-Winternheim, DE

Key dates

• Filing date: Feb 24, 2011
• Grant date: Aug 4, 2015
• Expiry date: Apr 14, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C21/002
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A lithium aluminosilicate glass and a method for producing such lithium aluminosilicate glass are provided. The glass has a composition, in mol %, of: SiO2 60-70; Al2O3 10-13; B2O3 0.0-0.9; Li2O 9.6-11.6; Na2O 8.2-less than 10; K2O 0.0-0.7; MgO 0.0-0.2; CaO 0.2-2.3; ZnO 0.0-0.4; ZrO2 1.3-2.6; P2O5 0.0-0.5; Fe2O3 0.003-0.100; SnO2 0.0-0.3; and CeO2 0.004-0.200. Further, the composition complies with the following relations and conditions: (Li2O+Al2O3)/(Na2O+K2O) greater than 2; Li2O/(Li2O+Na2O+K2O) greater than 0.47 and less than 0.70; CaO+Fe2O3+ZnO+P2O5+B2O3+CeO2 greater that 0.8 and less than 3, where at least four out of the six oxides are included. The glass exhibits a modulus of elasticity of at least 82 GPa and has a glass transition point below 540° C. and/or a working point below 1150° C.