Effect of Additive Na2O on Sintering Temperature, Crystal Structure and Magnetic Properties of BaFe12O19 magnet
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The BaFe12O19 magnet has been made at several sintering temperature (1100, 1150, 1200, 1250 and 1300oC) and various additive Na2O (0, 1, 2 and 3 % of weight) by using Powder Metallurgy. The BaFe12O19 powder and NaHCO3 powder as Na2O source were mixed with ethanol until homogeneous by using magnetic stirrer, dried at 80oC and calcined at a temperature 1000 oC for 1 hour. The calcined powders were milled by using a ball mill in dry condition. Then, the powders were mixed with 3 % PVA as a binder, then, the powder is put into a dies mold and pressed with a pressure of 30 MPa. The disc samples were sintered by using furnace Thermolyne. The characterization of the sintered sample was done such as measurement of density and porosity, analysis of crystal structure and measurement of magnetic properties. The characterization results show that the optimum sintering temperature is 1200 oC with additive 1% of Na2O, if more than 1 %, the physical and magnetic properties decrease. The composition of additive N2O at the sintering temperature 1200oC does not influence the crystal structure.