Invention Grant
- Patent Title: Method for producing a cylinder from synthetic quartz glass
- Patent Title (中): 从合成石英玻璃制造圆筒的方法
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Application No.: US12801378Application Date: 2010-06-04
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Publication No.: US08245542B2Publication Date: 2012-08-21
- Inventor: Stefan Ochs , Steffen Zwarg , Mirko Wittrin , Martin Trommer
- Applicant: Stefan Ochs , Steffen Zwarg , Mirko Wittrin , Martin Trommer
- Applicant Address: DE Hanau
- Assignee: Heraeus Quarzglas GmbH & Co. KG
- Current Assignee: Heraeus Quarzglas GmbH & Co. KG
- Current Assignee Address: DE Hanau
- Agency: Tiajoloff and Kelly LLP
- Priority: DE102009024267 20090605
- Main IPC: C03B37/018
- IPC: C03B37/018

Abstract:
A known method for producing synthetic quartz glass comprises the method steps: (a) forming a cylindrical SiO2 soot body having an inner portion and at least one free cylinder jacket surface surrounding the inner portion; (b) thermally drying the porous soot body; and (c) vitrifying the dried soot body with formation of the cylinder from synthetic quartz glass. Starting therefrom, to indicate a method which permits a particularly flat radial distribution in the inner portion of the cylinder, it is suggested according to the invention that the dried SiO2 soot body that is present after method step b) should be subjected to a homogenizing method prior to vitrification, the homogenizing method comprising the following steps: (I) heating the soot body to a consolidation temperature to form a sealing layer in the area of the at least one cylinder jacket, the sealing layer sealing the inner portion to the outside; (II) cooling the soot body from the consolidation temperature; and (III) annealing the soot body in the range of a homogenization temperature during a period of at least 5 hours so that the radial profile of the hydroxyl group concentration flattens in the inner portion.
Public/Granted literature
- US20100307197A1 Method for producing a cylinder from synthetic quartz glass Public/Granted day:2010-12-09
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