The Effect of Low Vacuum Curing to Physical and Magnetic Properties of Bonded Magnet Pr-Fe-B

摘要

In this paper, the physical and magnetic properties of isotropic bonded magnet Pr-Fe-B manufactured at atmospheric and low vacuum condition were discussed. The commercials Pr-Fe-B melt spun ribbon which mixed with epoxy resin binder was used as starting materials. The compaction method was using hydraulic press of 3 g sample (Φ 9 mm) with force of 3 tons. The atmospheric and low vacuum (P ~ 10 mbar) environment during curing process were sets with temperature varied from 100 °C to 200 °C. The curing time (t) variations of 30 m to 4 h were also done in the selected temperature to understand the short term aging effect. The optimum curing time was generated in 4 h which produced at the low vacuum curing that increased the sample density and magnetic flux with the value of 5.846 g/cm~3 and 2.51 kG, respectively. Generally it can be concluded that the process of low vacuum curing give a positive trends for manufacturing the bonded magnet Pr-Fe-B. The analysis of microstructure for mentioned parameters using SEM were also discussed.