Title:
Method for manufacturing iron-doped silica glass
Document Type and Number:
Japanese Patent JP6351727
Kind Code:
B2
Abstract:
A method for producing a blank of iron-doped silica glass with high silicic acid content for use as heat protection glass is provided. The method involves: (a) producing an iron-doped SiO2 soot body which contains iron in a first oxidation state Fe3+ by flame hydrolysis of a silicon-containing and an iron-containing starting substance, (b) drying the soot body to obtain a mean hydroxyl group content of less than 10 ppm by weight, and (c) vitrifying the soot body under a reducing atmosphere that is suitable for at least partially reducing the iron from the first oxidation state Fe3+ to a second, lower oxidation state Fe2+. A blank is obtained having an iron content between 0.1 and 1% by weight which exhibits an internal transmission of at most 40% in the infrared wavelength range and an internal transmission of at least 85% in the visible spectral range.
Inventors:
Stephan ox
Application Number:
JP2016543364A
Publication Date:
July 04, 2018
Filing Date:
September 11, 2014
Export Citation:
Assignee:
Heraeus Quarzglas GmbH & Co. KG
International Classes:
C03B8/04
Domestic Patent References:
| JP4270130A | ||||
| JP7215735A | ||||
| JP2005239547A | ||||
| JP2010519751A | ||||
| JP2013535404A |
Attorney, Agent or Firm:
Einzel Felix-Reinhard
Junichi Maekawa
Hiroyasu Ninomiya
Ueshima
Junichi Maekawa
Hiroyasu Ninomiya
Ueshima
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