发明授权
US09082538B2 Sintered Nd—Fe—B permanent magnet with high coercivity for high temperature applications
有权
用于高温应用的具有高矫顽力的烧结Nd-Fe-B永磁体
- 专利标题： Sintered Nd—Fe—B permanent magnet with high coercivity for high temperature applications
- 专利标题（中）： 用于高温应用的具有高矫顽力的烧结Nd-Fe-B永磁体
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申请号： US13132222申请日： 2008-12-01
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公开(公告)号： US09082538B2公开(公告)日： 2015-07-14
- 发明人: Mi Yan , Xiangzhi Zhou , Xiongfei Fan , Tianyu Ma , Wei Luo
- 申请人： Mi Yan , Xiangzhi Zhou , Xiongfei Fan , Tianyu Ma , Wei Luo
- 申请人地址： CN Hangzhou CN Dongyang
- 专利权人： ZHEJIANG UNIVERSITY,ZHEJIANG INNUOVO MAGNETICS INDUSTRY CO., LTD
- 当前专利权人： ZHEJIANG UNIVERSITY,ZHEJIANG INNUOVO MAGNETICS INDUSTRY CO., LTD
- 当前专利权人地址： CN Hangzhou CN Dongyang
- 代理机构： Hamre, Schumann, Mueller & Larson, P.C.
- 国际申请： PCT/CN2008/073270 WO 20081201
- 国际公布： WO2010/063142 WO 20100610
- 主分类号： H01F1/057
- IPC分类号： H01F1/057 ; H01F41/02
摘要：
A type of sintered Nd—Fe—B permanent magnet with high intrinsic coercivity of about 30KOe or more is produced by dual alloy method. The method comprises the following steps: preparing the powders of master phase alloy and intergranular phase alloy respectively, mixing the powders, compacting the powders in magnetic field, sintering the compacted body at 1050˜1125° C. and annealing at 890-1000° C. and 500-650° C. successively. In the process of preparing the powder of intergranular phase alloy, the nano-powder additive selected from the group consisting of NiAl, TiC, SiC, AlN, TiN, ZrN and the combination thereof is used to modify the powder of intergranular phase alloy.