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Faculty of Mechanical Engineering , University of Maribor , Maribor , Slovenia
Faculty of Mechanical Engineering , University of Maribor , Maribor , Slovenia
Faculty of Mechanical Engineering , University of Maribor , Maribor , Slovenia
Polymer bonded Nd-Fe-B magnets belong to the group of functional composite materials, which
consist mainly of two components: a polymer binder (PPS, PA) and magnetic particles of Nd-Fe-B
alloy. The appropriate amounts of polymer binder, magnetic powder and additives are compounded
by the twin screw extruder into a compound, that can be then injection moulded into a multi-cavity die
in the final products of complex shapes in large series. To achieve a successful injection moulding
and magnetic properties of the final products, it is necessary to choose the appropriate components
for preparation of compound for polymer bonded magnets. To accomplish this the following
parameters are crucial: the magnetic properties of powders, their fraction in the composite, shape,
average size and size distribution of the particles, the particle-particle interaction, and the addition of
additives (surface modifiers) and lubricants that improve the rheological, mechanical and corrosion
properties of polymer bonded magnets.
Within the presentation we will discuss about the relations between: (i) optimal components fraction,
(ii) magnetic and mechanical properties as well as (iii) acceptable viscosity of polymer melt during
the injection moulding
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