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Vol 11, Issue 1, 2016
Pages: 197 - 202
Research article
Nonmetallic materials
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Published: 21.04.2016. Research article Nonmetallic materials

COMPOUNDING OF POLYMER BONDED Nd-Fe-B MAGNETS

By
Mihael Brunčko ,
Mihael Brunčko
Contact Mihael Brunčko

Faculty of Mechanical Engineering , University of Maribor , Maribor , Slovenia

Peter Kirbiš ,
Peter Kirbiš

Faculty of Mechanical Engineering , University of Maribor , Maribor , Slovenia

Ivan Anžel
Ivan Anžel

Faculty of Mechanical Engineering , University of Maribor , Maribor , Slovenia

Abstract

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

References

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