Electrical resistant fluid-permeable heat generating member and

Details Electrical resistant fluid-permeable heat generating member and Electrical resistant fluid-permeable heat generating member and

1974-08-15

1976-06-22

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

252504, 252516, 428450, 428457, H01B 104

Patent

active

039650472

ABSTRACT:
A fluid-permeable electrically energized heat generating member of a desired shape, such as a rectangular brick, is formed by (1) mixing (a) about 87 to 94 percent by weight of a first material which contains about 80 to 95 percent by weight of SiC and about 5 to 20 percent by weight of a mixture of carbonyl iron, nickel-chromium alloy, cobalt and carbon; (b) about 5 to 10 percent by weight of a second material which contains about 75 to 95 percent by weight of an organic binder material, such as a linseed oil and about 5 to 25 percent by weight of a foaming material, such as methylene diphenyl isocyanate; and (c) about 0.2 to 3 percent by weight of a third material selected from the group consisting of polystyrene preformed powder, sawdust, wood flour, starch, corn flour and mixtures thereof; (2) placing the resultant mixture in a select mold and subjecting the mold to curing conditions sufficient to provide self-sustaining members composed of the foregoing mixture; (3) removing the self-sustaining members from the molds and subjecting them to a heat at a temperature in the range of about 250.degree.to 350.degree. F. for a period of time sufficient to render the bodies electrically conductive; (4) sintering the electrically conductive bodies as by passing a controlled electrical current through each member until a temperature in the range of about 1000.degree. to 1600.degree. F. is achieved within the member; and (5) metallizing terminal sides of each member, as by applying an aluminum layer thereon for contact with a suitable electrical circuit.

REFERENCES:
patent: 3153636 (1964-10-01), Shanta et al.

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