影响烧结Nd-Fe-B磁体退磁曲线方形度的因素  

The Factors Affecting the M-H Loop Squareness of Sintered Nd-Fe-B Magnets

作　　者：王占勇[1] 谷南驹[1] 王宝奇[1] 刘金芳 赵金伶 张志清 张巧格 

机构地区：[1]河北工业大学金属材料研究所,天津300132 [2]美国宾夕法尼亚洲电子能公司 [3]河北省冶金科技股份有限公司磁材部,河北石家庄050000

出　　处：《磁性材料及器件》2003年第1期7-11,共5页Journal of Magnetic Materials and Devices

摘　　要：通过分析具有不同退磁曲线方形度的磁体发现,烧结体的显微组织对磁体的方形度有很大影响。磁体中晶粒的异常长大会严重恶化磁体的方形度;晶粒的形状及晶界相等影响到退磁场的大小,进而影响到磁体的方形度;添加元素影响到磁体中的相结构和相分布,对反磁化场的均匀性有所影响。Investigation into the magnets with different M-H loop squareness reveals that the microstructure of sintered Nd-Fe-B magnets has great effect on the M-H loop squareness of the magnets. The abnormal grain growth deteriorates the M-H loop squareness seriously. The shape of the grain and the grain boundary affect the strength of demagnetization field, and consequently on the M-H loop squareness. The elements addition has effects on the phase structures and distributions in the magnets, which influence the uniform of demagnetization field.

关 键 词：烧结 退磁曲线 ND-FE-B磁体 方形度 晶粒 显微组织 添加元素 永磁材料 

分 类 号：TM273[一般工业技术—材料科学与工程]