Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder pretreatment
Reexamination Certificate
2006-05-08
2010-02-23
King, Roy (Department: 1793)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder pretreatment
Reexamination Certificate
active
07666348
ABSTRACT:
A production method includes: preparing a metal powder composed of one of Mo and W, and a binder composed of a thermoplastic resin and a wax; mixing the metal powder and 40 to 60 volume % of the binder with respect to the metal powder into a mixed powder; and heating and kneading the mixed powder into a raw material. The production method further includes: supplying a predetermined of the raw material in a hole of a die; and compacting the raw material into a cup-shaped green compact by pressing the raw material by a punch, the cup-shaped green compact having a cylindrical portion, a bottom formed at one end portion thereof, and an opening formed at another end portion thereof. The production method further includes: ejecting the cup-shaped green compact from the hole of the die; removing the binder from the ejected cup-shaped green compact by heating; and sintering the cup-shaped green compact by heating the green compact and diffusion-bonding particles of the green compact.
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Ishijima Zenzo
Murasugi Narutoshi
Okahara Masahiro
Hitachi Powdered Metals Co. Ltd.
King Roy
Oliff & Berridg,e PLC
Takeuchi Yoshitoshi
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