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    • 3. 发明授权
    • Permanent magnet
    • 永久磁铁
    • US4578125A
    • 1986-03-25
    • US392593
    • 1982-06-28
    • Masashi SahashiKoichiro InomataNaoyuki SoriHideki Yamamiya
    • Masashi SahashiKoichiro InomataNaoyuki SoriHideki Yamamiya
    • C22C19/07H01F1/055C04B35/00
    • C22C19/07H01F1/0557
    • Disclosed is a comprising a powdered alloy composed of 23 to about 29% by weight of samarium, 0.2 to about 7% by weight of titanium, 3 to about 9% by weight of copper, 10 to about 25% by weight of iron, and the balance of cobalt principally; said powdered alloy being sintered to obtain a sintered body, followed by(a) annealing the sintered body at a cooling rate of not more than 5.degree. C./min from an annealing-initiating temperature of from 600.degree. to 900.degree. C., or(b) subjecting the sintered body to a multi-stepwise aging processing initiated from a higher temperature to a lower temperature within the temperature range of from 350.degree. to 900.degree. C.The magnet is excellent in all the magnetic properties such as residual magnetic flux density, coercive force and maximum energy product, and also excellent in antioxidation property.
    • 公开了一种粉末状合金,其包含23至29重量%的钐,0.2至约7重量%的钛,3至约9重量%的铜,10至约25重量%的铁以及 钴的余量主要为 所述粉末状合金被烧结以获得烧结体,然后(a)从600℃至900℃的退火起始温度以不超过5℃/分钟的冷却速率对烧结体进行退火, 或(b)使烧结体在350〜900℃的温度范围内从较高的温度开始进行多步骤老化处理。该磁体具有优异的磁性能,例如残余磁性 磁通密度,矫顽力和最大能量乘积,抗氧化性也优异。