Method for improving the sinterability of cryogenically-produced

Details Method for improving the sinterability of cryogenically-produced Method for improving the sinterability of cryogenically-produced

1976-07-09

1978-05-23

Schafer, Richard E.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75212, 75213, C22C 104, B22F 102

Patent

active

040908747

ABSTRACT:
A method is disclosed of making sintered parts with cryogenically-produced powder derived from scrap metal, such as machine turnings. The scrap metal is subjected to two impacting operations (such as by use of a ball milling machine). The first operation is carried out with the use of a refrigerating agent (to lower the temperature of the scrap metal below its ductile-brittle transition temperature) thereby resulting in comminution of the scrap to a cryogenic powder. The second impacting operation is carried out at ambient temperature conditions utilizing milling elements which impart cold work to at least a portion of the cryogenic powder; simultaneously, copper is mechanically transferred to substantially each particle of said cryogenic powder to form a continuous copper envelope thereabout. The coated cryogenic powder is then compacted and sintered; the sintered product may be subjected to hardening or tempering treatments if desired.

REFERENCES:
patent: 2289897 (1942-07-01), Balk et al.
patent: 2301805 (1942-11-01), Harder
patent: 2402120 (1946-06-01), Boegeholn et al.
patent: 2853767 (1958-09-01), Burkhammer
patent: 3307924 (1967-03-01), Michael

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