High-frequency electric furnace

Details High-frequency electric furnace High-frequency electric furnace

1978-03-23

1979-02-27

Envall, Jr., R. N.

Electric heating

Microwave heating

Tunnel furnace

13 31R, 219 1049R, 219 1061R, H05B 500

Patent

active

041420632

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.

REFERENCES:
patent: 3696223 (1972-10-01), Metcalf et al.
patent: 3860737 (1975-01-01), Moscatello
patent: 4070542 (1978-01-01), Miles et al.

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