Method for improving the sinterability of...

Details Method for improving the sinterability of... Method for improving the sinterability of...

B - Operations, Transporting

30

B

13/4

B30B 9/32 (2006.01)

Patent

CA 1061513

ABSTRACT OF THE DISCLOSURE 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 sub- stantially 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. - 1 -

253158

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