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

Tetsuya Sawayama

Takehiro Tsuchida

Yoshikazu Seki

Masaaki Sato

Hiroshi Yaguchi

Hiroyuki Mitani

Nobuaki Akagi

Yuichi Seki

Akihiko Kagawa

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

A method for compacting powders for powder metallurgy comprises packing powders for powder metallurgy formulated with a lubricant in a compacting die applied with a lubricant on inner wall surfaces thereof, and subjecting the powders to warm or hot compaction. The powders contain the lubricant in an amount up to 0.2 wt %, non-inclusive of 0%, based on the total of the powders and the lubricant.

Method for compaction of powders for powder metallurgy

Growing community of inventors

Takasago, Japan

Tetsuya Sawayama