Lithium-aluminosilicate glass ceramic with high keatite content and structural member made thereof

US7107793B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Thorsten Doehring · Mainz, DE
• Ralf Jedamzik · Griesheim, DE
• Hauke Esemann · Wörrstadt, DE
• Eva Hoelzel · Ingelheim am Rhein, DE
• Ina Mitra · Stadecken-Elsheim, DE

Key dates

• Filing date: Aug 11, 2003
• Grant date: Sep 19, 2006
• Expiry date: Jan 25, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C10/0027
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A lithium-aluminosilicate glass ceramic is transformed by a suitable heat treatment into a glass ceramic comprising at least 80 vol.-% of keatite mixed crystals. This may be utilized for the preparation of optical or mechanical high-precision parts having a high temperature resistance, a good stability and compatibility with components consisting of metals having a small coefficient of thermal expansion based on nickel and iron, such as Invar®.