A study on the isotropic Nd₂Fe₁₄B/epoxy bonded magnets with high characteristics

This study was investigated to fabricate the isotropic Nd ₂Fen₁₄B/epoxy bonded magnets with high characteristics produced by compression molding. The magnetic characteristics of the bonded magnets were directly proportional to the density of the magnets and were enhanced by using raw Nd₂Fe₁₄B magnetic powders, having the mean particle size of 200 μm, without additional milling process. The high characteristics of the bonded magnets were achieved at the following conditions; epoxy resin of 2.0 wt%, silane coupling agent of 0.8 wt%, curing agent of 0.7 wt% on the base of magnetic powders, and curing condition of 150°C/3 hrs. The bonded magnets at the optimum conditions indicated the high characteristics such as the density of 6.1 g/cm³, the remanent flux density of 7.1 kG, the maximum energy product of 9.7 MGOe, and the compressive strength of 17 kg/mm².