Daido Steel Co., Ltd.

Daido Tokushuko Kabushiki Kaisha

Intermetallics Co., Ltd.

Hayato Hashino

Takao Yabumi

Masato Sagawa

Shinobu Takagi

Shunji Suzuki

Fumiya Kitanishi

Masahiro Hiraoka

Kazumasa Fujimura

Jumpei Hinata

Kazuya Gomi

Keiko Hioki

The present invention relates to an RFeB-based magnet in which a treatment (grain boundary diffusion treatment) for diffusing atoms of the heavy rare earth element Ris performed in a base material including an RFeB-based sintered magnet obtained by subjecting crystal grains in a raw-material powder including a powder of an RFeB-based alloy containing the light rare earth element R, Fe and B to orientation in a magnetic field and then sintering the oriented raw-material powder, or an RFeB-based hot-deformed magnet obtained by subjecting the same raw-material powder to hot pressing and then to hot deforming to thereby orient the crystal grains in the raw-material powder, and a method for producing the RFeB-based magnet.

RFeB-based magnet and method for producing RFeB-based magnet

A method for producing an RFeB system magnet with high coercivity by preventing a coating material from peeling off the surface of a base material during a grain boundary diffusion treatment is provided. A method for producing an RFeB system magnet which is a sintered magnet or a hot-deformed magnet containing, as the main rare-earth element, a light rare-earth element Rwhich is at least one of the two elements of Nd and Pr, the method including: applying, to a surface of a base material M of the RFeB system magnet, a coating material prepared by mixing a silicone grease and an R-containing powder containing a heavy rare-earth element Rcomposed of at least one element selected from the group of Dy, Tb and Ho; and heating the base material together with the coating material. Improved coating and base materials adhesion facilitates transfer of Rinto base material grain boundaries.

RFeB system magnet production method, RFeB system magnet, and coating material for grain boundary diffusion treatment

A material for anisotropic magnet, comprising,

Material for anisotropic magnet and method of manufacturing the same

The present invention provides a rare earth magnet, which is formed through at least hot molding, the rare earth magnet containing grains including an RXB phase as a main phase, and a grain boundary phase surrounding peripheries of the grains, in which R is at least one element selected from the group consisting of Nd, Pr, Dy, Tb and Ho, and X is Fe or Fe with a part being substituted by Co; in which an element RH is more concentrated in the grain boundary phase than in the grains, in which the element RH is at least one element selected from the group consisting of Dy, Tb and Ho; and the element RH is present with a substantially constant concentration distribution from the surface part of the magnet to the central part of the magnet.

Rare earth magnet and production process thereof

Growing community of inventors

Nagoya, Japan

Hayato Hashino