Zum Spritzgießen multipolarer kunststoffgebundener Dauermagnete auf Duroplast-Basis
Polymer bonded magnets represent an alternative to conventional permanent magnets and offer the possibility, especially in terms of actuators, to realize new driving concepts by injection molding. Polymer bonded magnets consist – as a composite material – of a matrix material and a hardmagnetic filler. The anisotropy of the hardmagnetic fillers plays a special role in terms of the processing and the subsequent component properties.
The production of polymer bonded magnets by injection molding is state-of-the-art, especially with a thermoplastic based matrix, and offers for example the possibility to realize complex geometries and magnetization structures as well as implementing the orientation process of the hardmagnetic fillers or functional integration in the production. However, the applications of polymer bonded magnets are limited, especially in the area of actuators, in terms of thermoplastic based matrix due to a reduced orientation in the surface layer and the thermal and media-resistant properties.
This work is dedicated to investigate the relationship between the material system, reaction kinetics and viscosity as a function of temperature and time premised of a thermoset based matrix material in polymer bonded magnets. Further, a model for the orientation of the hard magnetic fillers is devel-oped, taking into account the chemical reaction and adhesion incompatibilities, in order to define the magnetic and mechanical properties in the polymer bonded magnets based on thermosets. Accord-ingly, a deeper understanding of the production of polymer bonded magnets based on thermosets by injection molding is established in order to create the basis for using thermoset based polymer bonded magnets in the field of actuators, among other things, and thus increasing the fields of appli-cation.