Method of making a float glass convertible into a glass ceramic and float glass made thereby

US8728961B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Gerhard Lautenschlaeger · Jena, DE
• Andreas Langsdorf · Ingelheim am Rhein, DE
• Ulrich Lange · Mainz, DE
• Bernd Ruedinger · Wörrstadt, DE
• Klaus Schneider · Zell am Harmersbach, DE
• Michael Jacquorie · Rheinau, DE
• Friedrich Siebers · Nierstein, DE
• Wolfgang Schmidbauer · Mainz, DE

Key dates

• Filing date: Jul 27, 2011
• Grant date: May 20, 2014
• Expiry date: Jun 23, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B32/02
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A method is described for making a float glass convertible into a glass ceramic, by which a largely crystal fault-free glass can be produced. In this method the glass is cooled from a temperature (TKGmax), at which a crystal growth rate is at a maximum value (KGmax), to another temperature (TUEG), at which practically no more crystal growth occurs, with a cooling rate, KR, in ° C. min−1 according to:wherein ΔT=TKGmax−TUEG, and KGmax=maximum crystal growth rate in μm min−1. The float glass has a thickness below an equilibrium thickness, a net width of at least 1 m and has no more than 50 crystals with a size of more than 50 μm, especially no crystals with a size of more than 10 μm, per kilogram of glass within the net width.