Hamre, Schumann, Mueller & Larson, P.C.
Sintered Nd—Fe—B permanent magnet with high coercivity for high temperature applications
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.
ZHEJIANG INNUOVO MAGNETICS INDUSTRY CO., LTD ZHEJIANG UNIVERSITY
H H
H01F H01F
inventional inventional
Tianyu Wei Mi Xiongfei Xiangzhi
Ma Luo Yan Fan Zhou