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    • 3. 发明授权
    • Permanent magnet materials
    • 永磁材料
    • US3977917A
    • 1976-08-31
    • US493396
    • 1974-07-31
    • Yasuo FujimuraMasayuki Tada
    • Yasuo FujimuraMasayuki Tada
    • C22C19/07H01F1/053H01F1/055H01F1/06H01F1/04
    • H01F1/0557H01F1/06
    • Samarium cobalt magnetic materials for permanent magnets comprising, by atomic ratio relative to the samarium content, samarium of 1, cobalt of 4.0-5.2 and at least one addition selected from silicon up to 5.8 wt.% or 0.82 by atomic ratio to the samarium, germanium up to 8.5 wt.% or 0.57 by atomic ratio to the samarium and aluminum up to 4.75 wt.% or 0.82 by atomic ratio to the samarium, and having increased intrinsic coercive force and decreased irreversible magnetic induction loss with temperature. In the case wherein the total amount of the aforesaid addition or additions is limited, by atomic ratio to the samarium, to up to 0.25, the samarium cobalt magnetic materials may provide sintered permanent magnets having a reduced irreversible magnetic induction loss with temperature, without decreased residual magnetic flux density. When the total amount of the aforesaid addition is restricted, by atomic ratio to samarium, to up to 0.21, the resulting material may provide compacted permanent magnets having reduced irreversible magnetic induction loss with temperature, without any reduction of residual magnetic flux density.
    • 用于永磁体的钐钴磁性材料包括相对于钐含量的原子比为1的钐,4.0-5.2的钴和至少一种选自硅中至多5.8重量%或0.82原子比的钐, 锗与钐和铝的原子比高达8.5重量%或0.57,与钐相比高达4.75重量%或0.82原子比,并且具有增加的固有矫顽力和降低的不可逆磁感应损耗随温度升高。 在上述添加或添加的总量以钐的原子比限制至0.25以下的情况下,钐钴磁性材料可以提供具有降低的不可逆磁感应损耗随温度降低的烧结永磁体,而不减少 剩余磁通密度。 当上述添加量的总量以钐的原子比限制为高达0.21时,所得到的材料可以提供具有降低的不可逆磁感应损耗随温度降低的压实永磁体,而不会降低剩余磁通密度。