Method for producing synthetic quartz glass and quartz glass for use as cladding material of an optical fiber

US9272942B2 · kind B2 · utility

Assignee

• HERAEUS QUARZGLAS GMBH & CO. KG · DE

Inventors

• Martin Trommer · Bitterfeld-Wolfen, DE
• Steffen Zwarg · Wolfen, DE
• Ralph Sattman · Aschaffenburg, DE
• Bodo Kuehn · Gelnhausen, DE

Key dates

• Filing date: Dec 12, 2012
• Grant date: Mar 1, 2016
• Expiry date: Dec 12, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2213/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A known method for producing synthetic quartz glass comprises: (a) reacting a carbonic silicon compound-containing raw material with oxygen in a reaction zone into SiO2 particles, (b) precipitating the SiO2 particles on a sedimentation area by forming a porous SiO2 soot body containing hydrogen and hydroxyl groups, (c) drying the porous SiO2 soot body, and (d) glazing to the synthetic quartz glass by heating the soot body up to a glazing temperature. In order to facilitate cost-efficient production of quartz glass by means of pyrolyzing or hydrolyzing a carbon-containing silicon compound using a carbon-containing raw material, the invention describes the production of a soot body with a carbon content within the range of 1 ppm by weight to 50 ppm by weight.