超高矫顽力N35AH烧结Nd-Fe-B永磁材料的研制  

Preparation of N35AH Sintered Nd-Fe-B Permanent Magnet With Ultra-high Coercivity

作　　者：贺琦军 陈威 

机构地区：[1]宁波招宝磁业有限公司,浙江宁波315200

出　　处：《磁性材料及器件》2007年第6期49-51,66,共4页Journal of Magnetic Materials and Devices

摘　　要：重稀土金属Dy、Tb可以提高烧结Nd-Fe-B磁体的磁晶各向异性场,但过量的Dy和Tb会导致铸锭中R2Fe17相的增加,在晶界易形成R(FeCo)2和R(FeCo)3软磁性相,从而降低磁体的矫顽力。采用氢爆碎和双合金工艺混合烧结法制备Nd-Fe-B磁体,避免了软磁性Laves相的形成,研制出使用温度达到240℃的N35AH磁体。The substitution of heavy rare-earth elements such as Dy or Tb for Nd can enhance the anisotropy field HA of Nd-Fe-B magnet. However, over-substitution of heavy rare-earth element would conduce the form of the soft magnetic Laves phase of R（FeCo）2 and R（FeCo）3 at the grain boundary, which decreases the intrinsic coercivity. By using both the hydrogen decrepitation and double-alloy processes to avoid soft magnetic Laves phase, we prepared N35AH sintered Nd-Fe-B permanent magnet with ultra-high coercivity, which can be used at temperature up to 240℃.

关 键 词：烧结ND-FE-B磁体 使用温度 双合金工艺 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]