Apparatus and method for cold working metal powder

B - Operations – Transporting – 22 – F

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Details

18/1120, 18/1141

B22F 3/02 (2006.01) B22F 9/04 (2006.01) C21D 7/02 (2006.01)

Patent

CA 1086468

ABSTRACT OF THE DISCLOSURE An apparatus and method for cold working metal powder to produce a metal powder highly suited for consolidation wherein the apparatus comprises a cold rolling mill including a pair of driven rolls mounted within a sealed work chamber for receiving and deforming a closely metered amount of powder. The work chamber is continuously purged with an inert atmosphere to protect the powder from gaseous contaminants and circulating and filter means is provided for removing solid contaminants. To facilitate cold rolling the powder is lubricated prior to passage through the rolls and brushes are provided for cleaning any adhering powder from the surface of the rolls. The re- sulting cold worked powder particles have a coin, or plate-like, shape and demonstrate desirable properties for hot consolidation, such as, a low incidence of hollow particles and nonmetallic inclusions, the capability of achieving a condition of super- plasticity, and an increased tap density of the loose powder.

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