Indexed by:
Abstract:
Two magnets with the same nominal composition of (MM0.3Nd0.7)-Fe-B (Marked as A) and [(La0.27Ce0.53Pr0.03Nd0.17) Nd-0.3(0.7)]-Fe-B (Marked as B) were prepared using traditional powder metallurgical process, respectively. In order to point out the difference between two magnets, the magnetic properties, microstructure and magnetic domain of both magnets were investigated. Both magnets have the same elements, but different raw materials of misch-metal (MM) and La/Ce/Pr/Nd pure metal, which induces different magnetic properties. The magnet A with B-r of 13.1 kGs, H-cj of 7.6 kOe, (BH)(max) of 37.8 MGOe and magnet B with B-r of 13.4 kGs, H-cj of 5.8 kOe, (BH)(max) of 34.5 MGOe are obtained. Although both magnets have the similar B-r, magnet A has higher coercivity than that of magnet B. According to refined results of characteristic X-ray diffraction peaks, there is a hard magnetic main phase with higher magnetic anisotropy field (H-A) in magnet A and opposite case happens on magnet B. SEM images demonstrate that magnet A has more continuous RE-rich phase and smaller grain size compared to that of magnet B, which contributes to enhancing the coercivity. In addition, two main phases of [Nd-0.82(La, Ce)(0.18)]-Fe-B and [Nd-0.75(La, Ce)(0.25)]-Fe-B were detected by the EDX calculation, and the two main phases in both magnets were observed by magnetic domains again. Compared to magnet B, 2:14:1 main phases in magnet A contain more [Nd-0.82(La, Ce)(0.18)]-Fe-B main phases and less [Nd-0.75(La, Ce) 0.25]-Fe-B main phases, which also leads to higher coercivity due to the different H-A among Nd2Fe14B, La2Fe14B and Ce2Fe14B phases. Therefore, it is concluded that MM substitution could exhibit better magnetic properties than (La0.27Ce0.53Pr0.03Nd0.17)-metal substitution. Furthermore, applications of MM are beneficial to fabricate (MM, Nd)-Fe-B permanent magnets with lower cost. (C) 2017 Elsevier B.V. All rights reserved.
Keyword:
Reprint Author's Address:
Email:
Source :
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN: 0304-8853
Year: 2018
Volume: 449
Page: 390-394
2 . 7 0 0
JCR@2022
ESI Discipline: PHYSICS;
ESI HC Threshold:145
Cited Count:
WoS CC Cited Count: 13
SCOPUS Cited Count: 13
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 5
Affiliated Colleges: