Abstract
Densification of exchange-spring magnet ribbons of NdxFe85-xCo8V1B6 (x = 7-11) alloys has been investigated. The starting ribbon powders containing amorphous parts were prepared by melt spinning and were compacted by using a Spark Plasma Sintering (SPS) method. SPS is a type of solid compression sintering similar to hot-pressing and the sintering promotion factor is self heat generation by electric discharges between particles when the on-off D.C. pulse is applied. The bulk magnets indicated the springback phenomenon, pointing to multiple phases of the Nd2Fe14B type and the α-Fe type, and had isotropic magnetic properties. With increasing Nd content, Br decreased from 1.05 T to 0.82 T and HcJ increased from 256 kA/m to 832 kA/m. These changes were equivalent to those of the starting ribbons following annealing. The grain sizes of these bulk magnets were about 40 nm when x = 7-11. Under optimum preparation conditions, bulk Nd10Fe75Co8V1B6 magnet indicated (BH)max = 134 kJ/m3 (16.8 MGOe).
| Original language | English |
|---|---|
| Pages (from-to) | 2552-2554 |
| Number of pages | 3 |
| Journal | IEEE Transactions on Magnetics |
| Volume | 37 |
| Issue number | 4 I |
| DOIs | |
| Publication status | Published - 2001 Jul |
| Externally published | Yes |
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Keywords
- Bulk exchange-spring magnets
- Densification of melt-spun ribbons
- Isotropic magnetic properties
- Nd-Fe-Co-V-B system alloys
- Spark Plasma Sintering method
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Physics and Astronomy (miscellaneous)
Cite this
Isotropic bulk exchange-spring magnets with 134 kJ/m3 prepared by spark plasma sintering method. / Ono, Hideaki; Waki, Norihisa; Shimada, Munekatsu; Sugiyama, Tatsuo; Fujiki, Akira; Yamamoto, Hiroshi; Tani, Masato.
In: IEEE Transactions on Magnetics, Vol. 37, No. 4 I, 07.2001, p. 2552-2554.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Isotropic bulk exchange-spring magnets with 134 kJ/m3 prepared by spark plasma sintering method
AU - Ono, Hideaki
AU - Waki, Norihisa
AU - Shimada, Munekatsu
AU - Sugiyama, Tatsuo
AU - Fujiki, Akira
AU - Yamamoto, Hiroshi
AU - Tani, Masato
PY - 2001/7
Y1 - 2001/7
N2 - Densification of exchange-spring magnet ribbons of NdxFe85-xCo8V1B6 (x = 7-11) alloys has been investigated. The starting ribbon powders containing amorphous parts were prepared by melt spinning and were compacted by using a Spark Plasma Sintering (SPS) method. SPS is a type of solid compression sintering similar to hot-pressing and the sintering promotion factor is self heat generation by electric discharges between particles when the on-off D.C. pulse is applied. The bulk magnets indicated the springback phenomenon, pointing to multiple phases of the Nd2Fe14B type and the α-Fe type, and had isotropic magnetic properties. With increasing Nd content, Br decreased from 1.05 T to 0.82 T and HcJ increased from 256 kA/m to 832 kA/m. These changes were equivalent to those of the starting ribbons following annealing. The grain sizes of these bulk magnets were about 40 nm when x = 7-11. Under optimum preparation conditions, bulk Nd10Fe75Co8V1B6 magnet indicated (BH)max = 134 kJ/m3 (16.8 MGOe).
AB - Densification of exchange-spring magnet ribbons of NdxFe85-xCo8V1B6 (x = 7-11) alloys has been investigated. The starting ribbon powders containing amorphous parts were prepared by melt spinning and were compacted by using a Spark Plasma Sintering (SPS) method. SPS is a type of solid compression sintering similar to hot-pressing and the sintering promotion factor is self heat generation by electric discharges between particles when the on-off D.C. pulse is applied. The bulk magnets indicated the springback phenomenon, pointing to multiple phases of the Nd2Fe14B type and the α-Fe type, and had isotropic magnetic properties. With increasing Nd content, Br decreased from 1.05 T to 0.82 T and HcJ increased from 256 kA/m to 832 kA/m. These changes were equivalent to those of the starting ribbons following annealing. The grain sizes of these bulk magnets were about 40 nm when x = 7-11. Under optimum preparation conditions, bulk Nd10Fe75Co8V1B6 magnet indicated (BH)max = 134 kJ/m3 (16.8 MGOe).
KW - Bulk exchange-spring magnets
KW - Densification of melt-spun ribbons
KW - Isotropic magnetic properties
KW - Nd-Fe-Co-V-B system alloys
KW - Spark Plasma Sintering method
UR - http://www.scopus.com/inward/record.url?scp=0035386315&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0035386315&partnerID=8YFLogxK
U2 - 10.1109/20.951232
DO - 10.1109/20.951232
M3 - Article
VL - 37
SP - 2552
EP - 2554
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
SN - 0018-9464
IS - 4 I
ER -