INFLUENCE OF Bi-ADDITIONS ON THE MAGNETIC AND MICROSTRUCTURAL PROPERTIES OF (Nd, Dy)-Fe-Al-B MAGNETS
1993 ◽
Vol 07
(01n03)
◽
pp. 725-728
Keyword(s):
Powder metallurgical additions of Bi enhance the temperature stability of (Nd, Dy)-Fe-B permanent magnets. Bi is not solved in the hardmagnetic RE2Fe14B phase, thus does not influence the intrinsic magnetic properties, Only the microstructure of the sintered magnets is changed. Addition of a few wt.% of Bi leads to the formation of a new ternary intergranular phase with the composition Nd6Fe13Bi. This phase substitutes partially the intergranular Nd-rich phase providing the magnetic insulation of hardmagnetic grains. An enhancement of HCJ by about 40% was reached at 150 ºC for a Nd15.5Dy1.5Fe74AlB8 magnet containing 2.5 wt.% Bi compared to the Bi-free material.
Keyword(s):
2008 ◽
Vol 591-593
◽
pp. 96-101
Keyword(s):
Keyword(s):
2004 ◽
Vol 124
(11)
◽
pp. 699-702
◽
2008 ◽
Vol 591-593
◽
pp. 885-890
◽
1997 ◽
Vol 12
(10)
◽
pp. 2715-2718
◽
Keyword(s):
1989 ◽
Vol 4
(4)
◽
pp. 806-814
◽
Keyword(s):
1993 ◽
Vol 07
(01n03)
◽
pp. 721-724