SINTERED MAGNET AND ROTARY MACHINE

To provide a sintered magnet having both of a high coercive force and a high squareness ratio, which is one of sintered magnets containing Ce as an alternative element of Nd, and a rotary machine including the sintered magnet.SOLUTION: A sintered magnet comprises a rare earth element R, a transition...

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Hauptverfasser: FURUTA ATSUSHI, JINGU NOBUHIRO, SUWA TAKAHIRO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a sintered magnet having both of a high coercive force and a high squareness ratio, which is one of sintered magnets containing Ce as an alternative element of Nd, and a rotary machine including the sintered magnet.SOLUTION: A sintered magnet comprises a rare earth element R, a transition metal element T and boron B, in which the rare earth element R includes at least Nd, Y and Ce, and the transition metal element T includes at least Fe, the total content of the rare earth element R in the sintered magnet is [R] atom%, the total content of the transition metal element T in the sintered magnet is [T] atom%, the content of B in the sintered magnet is [B] atom%, the content of Y in the sintered magnet is [Y] atom%, the content of Ce in the sintered magnet is [Ce] atom%, [Y]/[R] is 0.05-0.25, [Ce]/[R] is 0.10-0.55, and [T]/[B] is 14-18.SELECTED DRAWING: Figure 1 【課題】Ndの代替元素としてCeを含む焼結磁石の中でも高い保磁力と高い角型比とを兼ね備える焼結磁石、及び当該焼結磁石を備える回転機を提供すること。【解決手段】焼結磁石は、希土類元素R、遷移金属元素T、及びホウ素Bを含有する焼結磁石であって、希土類元素Rが、少なくともNd、Y及びCeを含み、遷移金属元素Tが、少なくともFeを含み、焼結磁石における希土類元素Rの含有量の合計が[R]原子%であり、焼結磁石における遷移金属元素Tの含有量の合計が[T]原子%であり、焼結磁石におけるBの含有量が[B]原子%であり、焼結磁石におけるYの含有量が[Y]原子%であり、焼結磁石におけるCeの含有量が[Ce]原子%であり、[Y]/[R]が0.05〜0.25であり、[Ce]/[R]が0.10〜0.55であり、[T]/[B]が14〜18である。【選択図】図1