Polymer-bonded NdFeB permanent magnet

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Permanent magnets have become indispensable in today’s technology-focused world. The many different magnetic materials and their manifold characteristics have firmly established permanent magnets as important elements in countless application fields. In addition to the proven materials ferrite and AlNiCo, modern magnets are also made from rare earth materials such as neodymium-iron-boron and samarium-cobalt. Even small magnets made from these materials offer strong magnetic force and thereby cater to the growing demand for smaller and stronger magnets. Plastic-bonded neodymium-iron-boron magnets (NdFeB-p) are composite materials that consist of permanent magnetic powder made from NdFeB and embedded in plastic materials. Depending on the manufacturing technique, they can be either injection molded or pressed plastic-bonded magnets. Compared to sintered NdFeB magnets, these plastic-bonded permanent magnets are particularly suitable for high-precision parts. It is also possible to integrate axles, shafts and bearing bushes. Injection molding can be used to inexpensively produce complex or filigree shapes with different magnetic and mechanic properties. Another advantage of plastic-bonded magnets is their high resistance against corrosion and breakage. The highest magnetic performance within the product group of bonded magnets can be achieved by performing the injection within the magnetic field. However, due to the low fill quantity of magnetic powder, the performance of plastic-bonded neodymium-iron-boron magnets is still significantly lower than the performance of sintered magnets.