Colloidal graphite forging lubricant and method

Details Colloidal graphite forging lubricant and method Colloidal graphite forging lubricant and method

1976-08-05

1977-09-27

Schafer, Richard E.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

294205, 72 42, 75200, 75226, 252 26, 252 30, B22F 314, B22F 324

Patent

active

040509320

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: 3720512 (1973-03-01), Yamaguchi et al.
patent: 3779747 (1973-12-01), Conta
patent: 3894892 (1975-07-01), Conta
patent: 4002474 (1977-01-01), Blachford
patent: 4011077 (1977-03-01), Kaufman
Metal Progress, vol. 99, No. 4, pp. 54-60, Apr. 1971.
Wick, C. H. "Forging Gears From Powder Metal Preforms," In Machine & Production Eng. pp. 668-670, Oct. 21, 1970, vol. 117.
Pietrocini, J. W., Int. J. Pow. Met., vol. 6, No. 4, Oct. 1970, pp. 19-25.

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