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氮吹仪价格异性和粒子形状各

点击次数:1717  发布日期:2016-12-07  【打印此页
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c 晶各向氮吹仪价格异性和粒子形状各向异性两种,合金的磁硬化机制利于得到高的内禀矫 顽力。   (2)稀土钴永磁材料 第一代为15型稀土钴永磁材料:SmCo5,主要含 有金属Sm或者至少含有70%金属Sm,其余30%为较便宜的稀土金属,调整合 金的各向异性场即磁体的矫顽力,具有极高的内禀矫顽力和较好的温度特性。 (Sm80%,Pr20%最佳)Co5,以镨部分取代钐,镨的加入提高合金的最大磁能积, 矫顽力低于未取代的合金单相,各向异性场下降,因此为对磁体应用有利,但镨 的取代量不能太高,否则矫顽力下降过多,磁体长时间稳定性会下降。第二代为 217型稀土钴永磁材料:该型永磁体的饱和磁化强度,最大磁能积比15型 永磁体优良,但矫顽力较低,所以关键是如何提高矫顽力。二元稀土铁金属间 化合物的磁各向异性常数及各向异性场均小于15型,很难获得可适用的矫顽 力,因此通常添加入Fe、Cu、Zr等并经过适当热处理,可提


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