Preparation and characterization of epoxy resin bonded magnet prepared by using jet milled NdFeB

Abstract

The preparation of bonded magnets is done by mixing the magnetic powder of NdFeB product jet mill with a non-magnetic binder (epoxy resin). Comparison of variation of NdFeB magnetic powder composition with a binder (%wt) 97:3, 95:5, 92:8 of total mass 5 grams. After mixing the powder, then compacted with a hydraulic press, using a 1.8 cm diameter mold with a force of 5 tons, with a compaction time of 5 minutes. The pellet samples were characterized by physical and magnetic properties. Characterization of physical properties includes measurement of density, mechanical properties and corrosion resistance. Characterization of magnetic properties includes measurements of magnetic field strength and magnetic properties characteristics. Measurement of magnetic field strength using Gaussmeter and measurement of characteristic magnetic properties using VSM (Vibrating Sample Magnetometer). The results showed that the optimum physical properties density is the sample with the addition of 3 %wt epoxy resin (density of 5.285 g/cm3) and optimum physical properties compressive strength is the sample with the addition of 8 %wt epoxy resin (compressive strength 10 kgF/cm2) and optimum physical resistance corrosion is the sample with the addition of 3 %wt epoxy resin (with mass change 5,48 gram with time immersion 504 hours). And for the optimum magnetic properties obtained in the test sample with the addition of an epoxy resin binder composition of 3 %wt (magnetic field strength 1029.02 Gauss, remanence 62.21 emu/gram, coercivity 9457 Oe and saturation 101 emu/gram).