Method pertaining to the operation of electric furnaces, and a f

Details Method pertaining to the operation of electric furnaces, and a f Method pertaining to the operation of electric furnaces, and a f

1996-07-05

1999-08-31

Hoang, Tu Ba

Industrial electric heating furnaces

Resistance furnace device

With heating element detail

373109, 373133, H05B 362

Patent

active

059463414

ABSTRACT:
An electrically heated furnace includes an inner furnace chamber provided with heating elements of stabilized zirconium dioxide, and an outer furnace chamber in which further heating elements that can work at temperatures above 1800.degree. C. in an oxygen-containing atmosphere are provided. The outer heating elements are conveniently of a molybdenum silicide type, for instance elements marketed under the designation KANTHAL Super. Those walls that define the inner furnace chamber are made of zirconium dioxide material or some other suitable material that has a low specific thermal conductivity and that is capable of withstanding the high working temperature and the occurrent temperature swings. The outer furnace chamber, which completely surrounds the inner furnace chamber, is separated from the surroundings by conventional walls insulated, e.g., with ceramic fibres and/or high-temperature durable brick.

REFERENCES:
patent: 3128325 (1964-04-01), Andersen et al.
patent: 5544195 (1996-08-01), Hardt et al.

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