Effect of microstructure changes on magnetic properties of spark plasma sintered Nd-Fe-B powders

Waldemar Kaszuwara , Marcin Leonowicz , Bartosz Michalski , M. Lis


In this study the SPS method was applied for low RE content (8,5% at.) and high RE content (13,5 % at.) MQ powders. The powders were sintered in a wide range of temperature, for 5 min., under pressure of 35 MPa. The low RE content grade, densified reluctantly and gained the density close to the theoretical value only for 850 oC. The coercivity decreased gradually with increasing sintering temperature. On the other hand, the densification of the higher RE content grade powder occurred much easier and the coercivity, close to the theoretical value, was achieved already at 650 oC. The coercivity of this material also decreased with increasing sintering temperature. Microstructural studies revealed that the SPS sintering process leads to partial decomposition of the Nd2Fe14B phase. The proportion of the RE-rich and iron phases increases parallel to the increasing sintering temperature. On the basis of the current results one can conclude that fabrication of high density MQ powders based magnets by the SPS method is possible, however the powders having higher RE content should be used for this purpose and the sintering temperature as low as possible, related to density, should be kept.
Author Waldemar Kaszuwara (FMSE / DCFM)
Waldemar Kaszuwara,,
- Division of Construction and Functional Materials
, Marcin Leonowicz (FMSE / DCFM)
Marcin Leonowicz,,
- Division of Construction and Functional Materials
, Bartosz Michalski (FMSE / DCFM)
Bartosz Michalski,,
- Division of Construction and Functional Materials
, M. Lis - [Instytut Metali Niezelaznych, Gliwice]
M. Lis,,
Journal seriesEuropean Physical Journal Web of Conferences, ISSN 2100-014X
Issue year2013
Publication size in sheets0.3
ConferenceJoint European Magnetic Symposia (JEMS 2012), 09-09-2012 - 14-09-2012, Parma, Włochy
ProjectAdvanced materials and manufacturing method. Project leader: Zdunek Joanna, start date 04-01-2010, planned end date 31-12-2014, POIG.01.01.02-00-015/09, Implemented
Program Operacyjny Innowacyjna Gospodarka (PO IG)
Languageen angielski
epjconf_Jems2012_06002.pdf 4.16 MB
Score (nominal)0
Score sourcejournalList
ScoreMinisterial score = 0.0, 07-02-2020, ArticleFromJournal
Ministerial score (2013-2016) = 0.0, 07-02-2020, ArticleFromJournal
Publication indicators WoS Citations = 1; Scopus Citations = 1
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