Hitachi Metals, Ltd.

Naoki Mochi

Hiroshi Iwasaki

Takashi Takami

Yoshinori Kobayashi

Ryuji Gotoh

A method for producing a sintered ferrite magnet having an M-type ferrite structure and represented by: CaRBaFeCo, (by atomic ratio), where 0.3&#x2266;1&#x2212;x&#x2212;y&#x2266;0.65, 0.2&#x2266;x&#x2266;0.65, 0.001&#x2266;y&#x2266;0.2, 0.03&#x2266;z&#x2266;0.65, 4&#x2266;n&#x2266;7, and 1&#x2212;x&#x2212;y&#x3e;y. The method includes mixing a Ca compound, an R element compound, a Ba compound, an iron compound and a Co compound as starting materials; calcining the starting materials to obtain calcined bodies; pulverizing the calcined bodies to obtain a calcined powder; providing recycled materials having an M-type ferrite structure and being represented by the above formula; pulverizing the recycled materials to obtain a recycled material powder; mixing the recycled material powder with the calcined powder to form a moldable material; molding the moldable material to obtain green bodies; and sintering the green bodies to obtain the sintered ferrite magnet.

Rotating machine, bonded magnet, magnet roll, and method for producing sintered ferrite magnet

A rotating machine comprising a sintered ferrite magnet having an M-type ferrite structure, comprising Ca, an R element that is at least one of rare earth elements and indispensably includes La, Ba, Fe and Co as indispensable elements, and having a composition represented by the formula: CaRBaFeCo, wherein (1&#x2212;x&#x2212;y), x, y, z and n represent the contents of Ca, the R element, Ba and Co, and a molar ratio, meeting 0.3&#x2266;1&#x2212;x&#x2212;y&#x2266;0.65, 0.2&#x2266;x&#x2266;0.65, 0.001&#x2266;y&#x2266;0.2, 0.03&#x2266;z&#x2266;0.65, 4&#x2266;n&#x2266;7, and 1&#x2212;x&#x2212;y&#x3e;y; a bonded magnet comprising ferrite powder having the above composition and a binder, and a magnet roll, at least one magnetic pole portion of which is made of the above bonded magnet.

A sintered ferrite magnet having an M-type ferrite structure and comprising Ca, an R element which is at least one rare earth element indispensably including La, Ba, Fe and Co as indispensable elements, which is represented by CaRBaFeCo, wherein (1&#x2212;x&#x2212;y), x, y, z and n are numbers representing the amounts of Ca, the R element, Ba and Co and a molar ratio, meeting 0.2&#x2266;x&#x2266;0.65, 0.001&#x2266;y&#x2266;0.2, 0.03&#x2266;z&#x2266;0.65, and 4&#x2266;n&#x2266;7.

Oxide-type, magnetic material and it's production method, and sintered ferrite magnet and it's production method

A sintered ferrite magnet having an M-type ferrite structure and comprising Ca, an R element which is at least one rare earth element indispensably including La, Ba, Fe and Co as indispensable elements, which is represented by CaRBaFeCo, wherein (1--), x, y, z and n are numbers representing the amounts of Ca, the R element, Ba and Co and a molar ratio, meeting 0.2&#x2266;x&#x2266;0.65, 0.001&#x2266;y&#x2266;0.2, 0.03&#x2266;z&#x2266;0.65, and 4&#x2266;n&#x2266;7.

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Saitama-ken, Japan

Naoki Mochi