Method for producing a hollow cylinder of synthetic quartz glass, and thickwalled hollow cylinder obtained according to the method
US8316671B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2007 |
| Grant date | Nov 27, 2012 |
| Priority date | — |
| Expiry date | Jun 24, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2207/46
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A known method for producing a hollow cylinder of synthetic quartz glass comprises the steps of: (a) providing an inner tube of synthetic quartz glass having an inner bore defined by an inner wall, (b) cladding the inner tube (3′) with an SiO2 soot layer (4′), and (c) sintering the SiO2 soot layer with formation of the hollow cylinder. Starting therefrom, to indicate a method in which on the one hand the sintering process is completed before the hollow cylinder is further processed together with the core rod, and in which on the other hand a complicated machining of the inner bore of the hollow cylinder of quartz glass is not required, the invention suggests that during sintering the surface temperature of the inner wall of the inner tube should be kept below the softening temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.