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Properties and Processing of Polymer Bonded Magnets

The characteristic properties of polymers can be changed to a large extend by different fillers. While so far fillers were predominantly used e.g. for reducing the plastics in price or to improve their mechanical characteristics, magnetic modified polymers gain importance in particular for sensor applications and actuators by the increasing integration of electronic components in products.

The influence of the magnetizable fillers (in particular ferrites and rare earth metals) on the magnetic characteristics depends apart from the filler material and filler size distribution also on the polymer matrix and depends upon filler material also clearly on the orientation of the filler particles. The amount and homogeneity of the attainable magnetic characteristics of polymer bonded magnets differs due to thermal and flow induced, local filler distribution and filler orientation on the construction of the gate and part as well as on the processing.

Based on literature searches for the state of the art investigations in this contribution were systematically performed. The aim was to measure influences and to show interactions of the polymer-filler-systems, the construction and the injection moulding process on the attainable magnetic and mechanical characteristics as an example of compounds with polyamid matrix. The derivation of a process model can be an important base for a simulation of the injection moulding process of polymer bonded magnets.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Dietmar Drummer

Dietmar Drummer
Lehrstuhl für Kunststofftechnik
Universität Erlangen-Nürnberg

Information

Free keywords: Magnet, high-filled polymers, sensors, multi-component technology, injection molding, NdFeB, ferrit
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein (Betreuer), Prof. Dr.-Ing. Volker Altstädt, Prof. Dr.-Ing. Reinhard Lerch
Publication year: 2004
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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