Method of producing a bubble-free vitreous material

US4414014A · kind A · utility

Assignee

• Heraeus Quarzschmelze GmbH · DE

Inventors

• Rolf Bruning · Bruchköbel, DE
• Poul E. Breidenbach · Bruchköbel, DE
• Norbert Cibis · Alzenau, DE
• Fritz Aldinger · Rodenbach, DE
• Waltraud Werdecker · Hanau, DE

Key dates

• Filing date: Oct 19, 1981
• Grant date: Nov 8, 1983
• Expiry date: Oct 19, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B32/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

For the production of a bubble-free vitreous material, and in particular bubble-free vitreous silica, bubbles-containing vitreous material is exposed in a furnace, at a temperature which reduces its viscosity to a value between 10.sup.13.5 and 10.sup.8 Pa.sec, to the omnidirectional pressure ranging from 100 to 3000 bars of a gas which is insoluble in the vitreous material for a period of not less than 10 minutes and is then cooled.