NdFeB ? injection moulded0 pages

KOLEKTOR MAGNET TECHNOLOGY GmbH

KOERDYM I I C
KOERDYM& & C
TM

Injection Molded NdFeB & Compression Molded NdFeB
PLASTIC-BONDED PERMANENT MAGNETS KOERDYM

Oe

range of (BH)max values from approx. 32 to 86 kJ/m3. The manufacturing methods
used eliminate the need for machining and permit the production of close-toleranced
ready-to-install parts. In addition, injection molding makes it possible to connect the
magnets directly to shafts or other components. Diverse shaping possibilities
combined with insert and composite techniques and the typical toughness of plastics
allow the production of complex magnets offering new and cost-effective solutions in
design and manufacture.
NdFeB-based plastic-bonded isotropic permanent magnets from KOLEKTOR MAGNET
TECHNOLOGY GmbH are supplied under the names Koerdym I (injection molded) and
Koerdym C (compression molded), see Koerdym I & C Data table. Their special features
are high magnetic flux density, good magnetic and thermal stability, wide shaping
possibilities with close tolerances even on thin-walled parts, good mechanical
properties and high edge strength.
PLASTIC-BONDED NdFeB MATERIALS, COMPRESSION MOLDED AND INJECTION MOLDED

Plastic-bonded neodymium-iron-boron (NdFeB) is a magnetic material that still
fascinates today, many years after its introduction to the market. Depending on
binder, (BH)max values of between 32 and 86 kJ/m3 can be achieved, combined
with wide possibilities of shaping through plastic bonding.
Due to the technology of rapid solidification this material is not oriented, but its
isotropy offers advantages over oriented, sintered, hard-ferrite, particularly in multipole magnetic configurations.
Compression-molded, epoxy resin-bonded NdFeB is generally used in drive and
generator applications where the active mechanism is linearly dependent on the
remanence of the material; in miniaturized sensors; and in applications where NdFeB
systems offer advantages over hard ferrite.
Through the use of different powders, magnets can be tailored to application in
terms of very high remanence, thermal stability (e.g. Koerdym C 63 EP) or improved
reversible temperature coefficients.
Koerdym C 86 EP offers very high (BH)max values and can be used at
temperatures up to approx. 120°C depending on operating conditions. The highcoercivity grade Koerdym C 61 EP can be used at temperatures as high as 160°C and
is a good choice for use in servomotors.
Regarding the range of shapes that can be produced, the same limitations apply
as in powder metallurgy. Factors to be observed in design are maximum press
force, overall height, wall thickness ratios and contours in mould size. Wall
thicknesses as low as 0.8 mm can be achieved, while magnet heights up to 40 mm
Location of document: http://www.kolektor-kmt.de/products/pdf/magnets/KoerdymIandC.pdf Last update:10.08.2009