In this work, the mechanical and magnetic properties of a new Nd-Fe-B filled Hydrogenated nitrile butadiene rubber (HNBR) mixtures are investigated. The mass fraction of the magnetic particles was specifically modified to determine the magnetic and mechanical property trends. The particles have isotropic properties, so no magnetic fields are used for particle orientation during vulcanization. Increasing the filler concentration of the Nd-Fe-B powder leads to a reduction of the tensile strength and an increase in density, elongation at break and hardness of the mixture. The vulcanization times of the compound at different vulcanization levels show hardly any differences by changing the degree of filling. By increasing the filler content from 67% to 80%, the viscosity of the compound increases by a factor of 1.41, which has a strong influence on the processability of the material. Increasing the filling degree of the powder leads to an increase in remanence and the coercivity field strength HcB. For the coercivity field strength HcJ, hardly any change is detected due to the variation in filling level.
Isotropic polyphenylene sulfide (PPS) composites filled with the magnetic fillers strontium ferrites (SrFeO) and neodymium iron boron (NdFeB) at two concentrations of 52 vol.% and 60 vol.% were prepared by the injection molding technique without use of an external magnetic field. Frequency sweeps shows that the mechanical frequency has little influence on the strength of all PPS samples and only ensures a higher mobility of the PPS chain ends at high frequency. Increasing the magnetic filler content and the use of NdFeB instead of SrFeO provide the PPS composites a larger structural robustness making them more resistant to mechanical loads and mechanically more stable. The temperature behavior of the PPS composites shows independently of the filler a strong softening from 80 C. Nevertheless, larger operating temperatures below the glass transition temperature appear realistic.
K E Y W O R D Sdynamic-mechanical and thermal analysis, neodymium iron boron, plastic bonded magnets, polyphenylene sulfide, strontium ferrite
In this work, the influence of the magnetic field on the alignment degree of the magnetic particles and on the magnetic energy flux of elastomer bonded magnets are investigated. For the investigations, a strontium ferrite filled nitrile butadiene rubber is used. The change of magnetic flux density in the injection molding tool cavity was realized by changing the current at the rectifier. The alignment degree of the magnetic particles increases with increasing magnetic field in the injection molding tool cavity. Above a certain current strength, a saturation behavior of the alignment degree of the magnetic particles and the magnetic energy flux is reached. The change of the cavity magnetic field leads to an improvement of the pole angle error up to a current of 10 A. An increase of the current above 10 A leads to hardly any improvement of the pole angle error, since a saturation in the alignment of the magnetic particles has already been reached.
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