Mechanical, magnetic properties and corrosion resistance of hybrid bonded magnet NdFeB-BaFe12O19

The hybrid bonded magnet NdFeB - BaFe12O19 has been made. The composition of BaFe12O19 was varied as 0, 3, 5, 8, and 10 wt%. The preparation process was started by mixing BaFe12O19 powder with NdFeB (MQP-B+), then mixed with exopy resin binder of 8 wt% and subsequently compacted with a pressure of 60 MPa to form a pellet. The pellet samples were heated in 10 mmbar of vacuum dryer at 90 degrees C for 1 hour. Some parameters were measured such as mechanical properties (compressive strength), magnetic properties (magnetic flux density and hysteresis curve) and corrosion resistance. The results show that the hybrid bonded magnet NdFeB with 10 wt% BaFe12O19 exhibits the highest compressive strength of about 268,15 kgf/cm(2). While the optimum corrosion resistance of bonded magnet NdFeB - BaFe12O19 is obtained by 5 wt% BaFe12O19 addition. It has a flux magnetic density of 1340 Gauss, remanence B-r of 3,827 kG and coercivity H-cj of 8,924 kOe. According to the corrosion test result, it is found that the sample with higher content of Ba-ferrite has a better corrosion resistance compare to the sample with small content of Ba-ferrite.