| 摘要 |
PURPOSE:To make a compound magnet with long pot life and to improve the maximum energy product ((BH) max) by using latent curing agent made of epoxy resin amineadduct as epoxy resin curing agent. CONSTITUTION:The anisotropic Nd-Fe-B-Co magnetic powder (average grain diameter: 1mm) of 100 weight percent that is prepared through super cooling method and upsetting treatment and oleic acid of 0.9 weight percent are kneaded together in the nitrogen atmosphere by a high speed mixer for 10min. Further, epoxy resin (Epikote 828, made by Yuka Shell Epoxy) of 1.6 weight percents is added to the mixture, followed by mixing them for 10min. Next, latent hardener (Amicure PN-23 made by Ajino-Moto) of 0.4 weight percent is added and the compound is mixed for 10min to complete the distribution. The plastic magnetic compound thus prepared is then put in a die and treated for compression molding in a magnetic field of 15kOe under a compression strength of 6ton/cm<2>, followed by curing the compound at 100 deg.C for 1 hour. With this process, the magnetic characteristic of the molded product can be improved and pot life of the compound can be extended. |
