Kabushiki Kaisha Kobe Seiko Sho

Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

Akihiko Kagawa

Hironori Suzuki

Kazuhisa Fujisawa

Hiroyuki Mitani

Takehiro Tsuchida

Yoshikazu Seki

Masahiro Murakami

Yuichi Seki

Masaaki Sato

Tetsuya Sawayama

Hirotaka Hanaoka

Kunihiro Yoshioka

Disclosed is a method for the compaction of a soft magnetic powder capable of manufacturing a green compact which has attained high density and high strength, is excellent in mechanical properties and magnetic properties, and does not cause a reduction in electrical resistance. Soft magnetic powder particles individually surface-coated with an insulating vitreous layer containing P, Mg, B, and Fe as essential components are used, and a lubricant is applied to the inner wall surface of a compaction die. The soft magnetic powder is subjected to compaction at from not less than room temperature to less than 50&deg; C. without mixing the lubricant with the soft magnetic powder, followed by annealing at from 50 to 300&deg; C.

Method for the compaction of soft magnetic powder

Disclosed is a powder metallurgical mixed powder capable of preventing the defective dispersion, that is, the segregation of physical property improving powders and a lubricant powder without reduction in lubricity, and of suppressing the generation of dust upon handling of powders; and a powder metallurgical binder capable of realizing such a mixed powder. The binder including a copolymer containing monomer components of ethylene and propylene, which may be combined with a liquid binder having a specified composition as needed, is added to a powder metallurgical raw powder.

Powder metallurgical binder and powder metallurgical mixed powder

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Takasago, Japan

Akihiko Kagawa