Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1976-04-09
1977-08-09
Padgett, Benjamin R.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75211, 264 63, 264104, B22F 100
Patent
active
040408230
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% by weight of a first material which contains about 80 to 95% by weight of SiC and about 5 to 20% by weight of a mixture of carbonyl iron, nickel-chromium alloy, cobalt and carbon; (b) about 5 to 10% by weight of a second material which contains about 75 to 95% by weight of an organic binder material, such as a linseed oil and about 5 to 25% by weight of a foaming material, such as methylene diphenyl isocyanate; and (c) about 0.2 to 3% 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: 3255500 (1966-06-01), Engel et al.
patent: 3650736 (1972-03-01), Broom
patent: 3699058 (1972-10-01), Matsuoka et al.
Cleland Lorraine M.
Kyle Deborah L.
Padgett Benjamin R.
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