Characterization of Physical and Magnetic Properties in the Manufacture of Barium Hexaferrite Permanent Magnets with Variation of Holding Time at Sintering Temperature

The impact of holding time during the sintering process on the magnetic and microstructure physical characteristics was examined in this study. Production of permanent magnets based on the proper stoichiometric ratio of Fe2O3 and BaCO3 combined utilizing powder metallurgical techniques. A ball mill is used to blend iron powder with barium carbonate for six hours at 900 rpm. After that, the powder is sieved to a size of 200 mesh and calcined at 1100 °C. It was then sintered at 1100 °C with holding times of 10, 20, and 30 min after being squeezed under 5 tons of pressure. The powder is then calcined at 1100 °C after being sieved to a size of 200 mesh. After being squeezed under five tons of pressure, it was sintered at 1100 °C for 10, 20, and 30 min. The size and distribution of the crystal due to holding time are displayed in the SEM photos. Because of the notable variations in crystal structure, the sample’s hysteresis curves have dramatically different values for HC, MS, and MR.