Method for the production of a composite body from a basic body of opaque quartz glass and a tight sealing layer

US8408027B2 · kind B2 · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Waltraud Werdecker · Hanau, DE
• Johann Leist · Schongau, DE

Key dates

• Filing date: Jun 18, 2008
• Grant date: Apr 2, 2013
• Expiry date: Jul 28, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2218/11
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

To optimize a known method for producing a composite body from a basic body of opaque quartz glass and a dense sealing layer, in such a way that the basic body can be provided with the dense sealing layer without any significant changes and deformations in the opaque material being noticed, the invention suggests a method comprising the following steps: (a) producing the basic body by using a first slip which contains larger amorphous SiO2 particles; (b) providing a second slip which contains smaller amorphous SiO2 particles and the composition of which differs from that of the first slip at least in that it contains SiO2 nanoparticles in the range between 0.2% by wt. to 15% by wt. and which is distinguished by a relatively low vitrification temperature; (d) producing a slip layer from the second slip on a surface of the basic body, drying the slip layer, and (e) subsequently vitrifying the slip layer with formation of the dense sealing layer.