Compositions – Electrolytes for electrical devices
Patent
1975-04-07
1977-03-22
Gantz, Delbert E.
Compositions
Electrolytes for electrical devices
72 42, 252 495, C10M 110, C10M 302, C10M 502, C10M 704
Patent
active
040135705
ABSTRACT:
An improved colloidal graphite hot forming lubricant and hot forming process for high density ferrous powdered metal articles using this lubricant. Extremely fine powdered copper is included in an otherwise conventional colloidal graphite hot forming lubricant. High quality, including high density, ferrous metal articles are produced by coating a ferrous powdered metal preform with this lubricant, presintering the coated preform at a higher temperature of 2100.degree. - 2500.degree. F. for a short time by induction heating, allowing the presintered preform to cool to a desired hot forming temperature below 2000.degree. F., and then hot forming the preform in the usual manner. Lubricant-preform interaction at the higher temperature is precluded, making long presintering times and special presintering equipment necessary.
REFERENCES:
patent: 2326000 (1943-08-01), Teeple
patent: 2416480 (1947-02-01), Henry et al.
patent: 3804761 (1974-04-01), Milz et al.
patent: 3931020 (1976-01-01), Burgess et al.
"Copper-Graphite Materials with Additives of Graphite Granules Plated with Copper" by D. S. Yas et al. in Porosh. Met. (USSR), No. 5, pp. 70-75, S15150034, May, 1971.
Gantz Delbert E.
General Motors Corporation
Vaughn I.
Wallace Robert J.
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