Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Reexamination Certificate
2006-05-16
2006-05-16
Jenkins, Daniel (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
C148S108000
Reexamination Certificate
active
07045092
ABSTRACT:
A perpendicular pressing/compacting method for a rare-earth alloy powder is provided to produce a sintered magnet with excellent magnetic properties. A method for pressing a rare-earth alloy powder by using a die is provided. The die is made of a non-magnetic material and has a die hole to define a cavity and a pair of yoke members provided on both sides of the cavity. The method includes the steps of: providing the rare-earth alloy powder; filling the cavity of the die with the rare-earth alloy powder; and compressing the rare-earth alloy powder, loaded in the cavity, between a pair of opposed press surfaces. A pulse magnetic field substantially perpendicular to a compressing direction is not applied until the apparent density of the rare-earth alloy powder in the cavity reaches a predetermined value, at least equal to 47% of the true density thereof, while the compressing step is being carried out.
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JP09-31229A, English translation of Example, 10 pages, Dec. 1997.
Ogawa Atsushi
Okumura Shuhei
Costellia Jeffrey L.
Jenkins Daniel
Neomax Co. Ltd.
Nixon & Peabody LLP
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