High-frequency electric furnace
US4142063A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1978 |
| Grant date | Feb 27, 1979 |
| Priority date | — |
| Expiry date | Mar 23, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2205/64
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a high-frequency furnace whose wall is formed by superposed wall-forming members. This furnace includes in particular an inner tubular wall comprising a zirconia tube (38), an alumina washer (39) laid on the zirconia tube and a silica tube (40) laid on the washer. There is a large groove (41) in a top plate (37) to accommodate the silica tube (40). The furnace also includes an outer tube (36) of silica. This structure makes it possible to accommodate differential expansion of the zirconia and the silica in two separate steps. The axial difference is accommodated at the groove (41) while the radial difference is accomodated at the washer (39). Leakage of inert gas pumped into the chamber during operation can then be maintained within acceptable limits throughout the temperature range. Application to the production of optical fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.