US 11,798,739 B2
Samarium-iron-nitrogen based magnet powder and method of manufacturing same, and samarium-iron-nitrogen based magnet and method of manufacturing same
Ryuji Hashimoto, Tokyo (JP); Yasushi Enokido, Tokyo (JP); Shusuke Okada, Aichi (JP); and Kenta Takagi, Aichi (JP)
Assigned to TDK Corporation, Tokyo (JP)
Appl. No. 17/42,443
Filed by Ryuji Hashimoto, Tokyo (JP); Yasushi Enokido, Tokyo (JP); Shusuke Okada, Aichi (JP); and Kenta Takagi, Aichi (JP)
PCT Filed Mar. 27, 2019, PCT No. PCT/JP2019/013316
§ 371(c)(1), (2) Date Sep. 28, 2020,
PCT Pub. No. WO2019/189440, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-065356 (JP), filed on Mar. 29, 2018.
Prior Publication US 2021/0082605 A1, Mar. 18, 2021
Int. Cl. H01F 1/059 (2006.01); H01F 41/02 (2006.01); B22F 1/00 (2022.01); B22F 10/32 (2021.01)
CPC H01F 41/0266 (2013.01) [B22F 1/00 (2013.01); H01F 1/059 (2013.01); H01F 41/02 (2013.01); B22F 10/32 (2021.01)] 8 Claims
OG exemplary drawing
 
1. A samarium-iron-nitrogen based magnet powder, comprising:
a main phase containing samarium and iron; and
a sub-phase containing samarium, iron, and zirconium,
wherein an atomic ratio of a rare earth element to an iron group element is greater than an atomic ratio of the rare earth element to the iron group element of the main phase,
wherein at least a part of a surface of the main phase is coated with the sub-phase
wherein oxygen content of the samarium-iron-nitrogen based magnet powder is in a range from 0.8% by mass to 1.2% by mass, and
wherein the sub-phase has the atomic ratio of the rare earth elements to the iron group elements is 0.50 or more.