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Title:
REDUCTION OF THE CARBON CONTENT OF SILICA GRANULATE, AND PRODUCTION OF A SILICA GLASS ARTICLE
Document Type and Number:
WIPO Patent Application WO/2017/103167
Kind Code:
A3
Abstract:
The invention relates to a method for producing a silica glass article, involving method steps i.) providing a silica granulate, the providing involving at least the steps of: I. providing silica powder; and II. processing the silica powder so as to obtain a silica granulate, the silica granulate having a larger particle diameter than the silica powder, the processing involving the following steps: 1) processing the silica powder to obtain a silica granulate I that has a first carbon content wC(1), 2) treating silica granulate I with a reactant so as to obtain a silica granulate II having another carbon content wC(2), which is lower than the first carbon content wC(1); ii.) forming a glass melt from the silica granulate; and iii.) forming a silica glass article from at least some of the glass melt. The invention further relates to a silica glass article that can be obtained by said method. The invention also relates to an optical waveguide, an illuminant and a molded article, each of which can be obtained by further processing the silica glass article. The invention finally relates to a silica granulate II that can be obtained as an intermediate product in the disclosed method.

Inventors:
OTTER MATTHIAS (DE)
LEHMANN WALTER (DE)
HÜNERMANN MICHAEL (DE)
NIELSEN NILS CHRISTIAN (DE)
WHIPPEY NIGEL ROBERT (DE)
GROMANN BORIS (DE)
KPEBANE ABDOUL-GAFAR (DE)
KAYSER THOMAS (DE)
Application Number:
PCT/EP2016/081520
Publication Date:
November 23, 2017
Filing Date:
December 16, 2016
Export Citation:
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Assignee:
HERAEUS QUARZGLAS (DE)
International Classes:
C03B20/00; C03B37/012; C03C1/02; C03C3/06; C03B17/04; C03B19/10
Foreign References:
US20110100063A12011-05-05
EP0890555A11999-01-13
EP1167309A12002-01-02
EP1088789A22001-04-04
US20060137400A12006-06-29
DE102011121153B32013-03-21
EP0711736A11996-05-15
US20040118155A12004-06-24
US20090208760A12009-08-20
US4650511A1987-03-17
US6136736A2000-10-24
US20060055300A12006-03-16
US20060183623A12006-08-17
Attorney, Agent or Firm:
HERZOG FIESSER & PARTNER PATENTANWÄLTE PARTG MBB (DE)
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