A 30 % increase in coercivity (HCJ)
with only 0.6 wt. % of Dy achieved by combining electrophoretic
deposition of DyF3 with a modified grain-boundary
diffusion process. With one HRE lean system, a remanence Br
> 1.3 T, and a coercivity HCJ > 2000 kA/m was achieved.
NdFeB films have been micro-patterned by
lithography followed by lift-off, to produce model structures for
the study of grain-boundary engineering.
Significant increases in coercivity were achieved
with powders produced from strip-cast HRE-free alloys with an
average particle size of 1.5-2
:m, produced by jet milling.
HRE free samples with an ultrafine
microstructure were prepared and coercivities reached up to
1600 kA/m. A grain size reduced by 50 % (4
:m → 2
:m) has led to an increase
of about 30 % in coercivity.
Corrosion resistance of NdFeB powders was
greatly enhanced by sol-gel coating.
Substantial improvement of reliability of
interpreting EELS spectra of Dy-containing NdFeB magnets.
Promising new magnetic Heusler alloys
have been identified by database mining. The magnetic
database is accessible at
New ternary magnetic Heusler compounds (e.g. Co2MnTi)
with high magnetization have been fabricated.
Significant increase in coercivity was
observed in milled MnAlC powders, anisotropic MnAlC magnets
with promising properties have been produced by hot
Uestuener, M. Katter, W. Rodewald, IEEE Trans.
Magn. 42 (2006)
Development of hard magnets:
Ball-milled, partly oriented Y(Co,Fe) alloy powders with
energy products of up to 140 kJ/m3
Hot extrusion of oriented MnAl alloys with useful energy