Electric furnaces

Details Electric furnaces Electric furnaces

1976-03-24

1978-07-25

Myhre, Charles J.

Heat exchange

With valve or movable deflector for heat exchange fluid flow

With by-pass of heat exchanger or heat exchanger section

165135, 13 8, F27D 1104

Patent

active

041030990

ABSTRACT:
Impregnation of a porous carbon body involving deposition of carbon from a as can be effected by establishing a thermal gradient across the body such that carbon is deposited at a boundary which advances through the body. The present furnace is for use in such a process and comprises a heater element with which, in use, the body is in contact and a cooled surface facing the element, characterized in that the latter surface is covered with a layer of thermal insulating material to reduce the thermal gradient across the body. This improves the economy of the process. The insulating material is suitably fibrous, eg graphite felt, and is protected by a layer of relatively low permeability, eg graphite sheet, to prevent deposition of carbon which would reduce its insulation properties.
Such a furnace suitable for impregnating flat bodies, eg brake discs, comprises flat mutually parallel electrical heater elements connected electrically in series having water-cooled felt-covered panels located between them and outside the outermost elements.

REFERENCES:
patent: 3164487 (1965-01-01), Carley-Macauly
patent: 3322644 (1967-05-01), Benson
patent: 3788089 (1974-01-01), Graves
patent: 3809149 (1974-05-01), Deutsch
patent: 3900358 (1975-08-01), Bujas
patent: 4015068 (1977-03-01), Vohler

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