US 11,705,256 B2
Neodymium-iron-boron permanent magnet and preparation method and use thereof
Feng Xia, Inner Mongolia (CN); Yu Wang, Inner Mongolia (CN); Yanli Li, Inner Mongolia (CN); Yonghuai Feng, Inner Mongolia (CN); Chunguang Liu, Inner Mongolia (CN); Haiyuan Zhang, Inner Mongolia (CN); Jixiang Liu, Inner Mongolia (CN); Manyou Su, Inner Mongolia (CN); and Gazhen Liu, Inner Mongolia (CN)
Assigned to BAOTOU JINSHAN MAGNETIC MATERIAL CO., LTD., Inner Mongolia (CN)
Filed by Baotou Jinshan Magnetic Material Co., Ltd., Inner Mongolia (CN)
Filed on Jul. 21, 2021, as Appl. No. 17/381,846.
Claims priority of application No. 202110602728.1 (CN), filed on May 31, 2021.
Prior Publication US 2022/0384071 A1, Dec. 1, 2022
Int. Cl. H01F 1/057 (2006.01); B22F 3/24 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); H01F 41/02 (2006.01); B22F 9/04 (2006.01)
CPC H01F 1/0577 (2013.01) [B22F 3/24 (2013.01); C22C 33/02 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); H01F 41/0266 (2013.01); B22F 9/04 (2013.01); B22F 2003/248 (2013.01); B22F 2009/044 (2013.01); B22F 2202/05 (2013.01); B22F 2301/355 (2013.01); B22F 2998/10 (2013.01); C22C 2202/02 (2013.01)] 11 Claims
 
1. A neodymium-iron-boron permanent magnet, having a composition represented by formula I:
[mHR(1−m)(Pr25Nd75)]x(Fe100-a-b-c-dMaGabIncSnd)100-x-yBy  formula I;
where a is 0.995-3.493, b is 0.114-0.375, c is 0.028-0.125, d is 0.022-0.100; x is 29.05-30.94, y is 0.866-1.000; m is 0.02-0.05;
HR is Dy and/or Tb; and
M is at least one selected from the group consisting of Co, Cu, Ti, Al, Nb, Zr, Ni, W and Mo.