Sumitomo Special Metals Co., Ltd.

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Sumitomo Special Metal Co. Ltd.

Hitoshi Yamamoto

Masato Sagawa

Yutaka Matsuura

Setsuo Fujimura

Norio Togawa

Naoyuki Ishigaki

Satoshi Hirosawa

Nobutaka Suzuki

Masaki Koga

Koki Tokuhara

Hitoshi Saitoh

Shuji Mino

Kenshiro Oyamada

Akira Higuchi

Its basic means is a monolithically bonded construct prepared by monolithically bonding together a rare-earth magnet,and a an alloy material that is a high melting point metal or a high specific-tenacity material through the solid phase diffusion bonding by the hot isostatic pressing treatment, and a monolithically bonded construct with an interposal of a thin layer of the high melting point metal between a rare-earth magnet,and an alloy material,that is a high specific-tenacity material. As a method for the bonding, there is used a hot isostatic pressing treatment method in which a rare-earth An magnet and a high melting-point metal are laminated together, thereby to prepare an object to be treated, then the object is put into a hermetic-type high pressure container having an inner wall portion equipped with a heater, then the object is uniformly pressurized in all directions by a synergistic effect caused by pressure and temperature, while the object is maintained for a certain period of time under a certain pressure and temperature condition in an atmosphere of an inert gas, thereby to monolithically bond the object. With this, it is possible to obtain a bonded construct in which a magnet can monolithically be bonded with another metal member with a high strength, without deteriorating magnetic characteristics, such that the rare-earth magnet's insufficiency in brittleness, rigidity, tenacity and the like is compensated.

Monolithically bonded construct of rare-earth magnet and metal material and method for bonding same

A magnetically anisotropic sintered permanent magnet of the FeCoBR system (R is sum of R.sub.1 and R.sub.2) wherein:

Permanent magnets

An (Fe, Co)-B-R tetragonal type magnet having a high corrosion resistance, which has a boundary phase stabilized by Co and Al against corrosion, and which consists essentially of:

Rare earth magnet having excellent corrosion resistance

A process for producing permanent magnet materials, which comprises the steps of:

Process for producing permanent magnets and products thereof

A magnetically anisotropic sintered permanent magnet of the FeBR system in which R is sum of R.sub.1 and R.sub.2 wherein:

Permanent magnet

Permanent magnetic materials of the Fe-B-R type are produced by:

Process for producing magnetic materials

A permanent magnetic alloy comprising of an intermetallic compound of rare earth elements and transition metals, shown by the formula:

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Osaka, Japan

Hitoshi Yamamoto