Effect of Sintering Temperature to Physical, Magnetic Properties and Crystal Structure on Permanent Magnet BaFe12O19 Prepared From Mill Scale
| Main Authors: | Purba, Ramlan, Muljadi, Muljadi, Sardjono, Priyo, Gulo, Fakhili, Setiabudidaya, Dedi |
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| Format: | Article PeerReviewed |
| Terbitan: |
, 2017
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| Subjects: | |
| Online Access: |
http://dx.doi.org/10.1088/1757-899X/214/1/012009 http://eprints.unsri.ac.id/7514/ |
Daftar Isi:
- Permanent magnet of Barium hexa Ferrite with formula BaFe12O19 has been made by metallurgy powder method from raw materials : Barium carbonate (BaCO3 E-merck) and Iron Oxide (Fe2O3 from mill scale). Both of raw materials have been mixed with stoichiometry composition by using a ball mill for 24 hours. The fine powder obtained from milling process was formed by using a hydraulic press at pressure 50 MPa and continued with sintering process. The sintering temperature was varied : 1150oC, 1200oC, 1250oC and 1300oC with holding time for 1 hour. The sintered samples were characterized such as : physical properties (bulk density , porosity and shrinkage), magnetic properties (flux density, remanence, coercivity and magnetic saturation) by using VSM and crystal structure by using XRD. According characterization results show that the crystal structure of BaFe12O19 does not change after sintering process, but the grain size tends to increase. The optimum condition is achieved at temperature 1250oC, and at this condition, the sample has characterization such as : bulk density =4.35 g/cm3, porosity= 1.03% and firing shrinkage= 11.63%, flux density = 681.1 Gauss, remanence (σr) = 20.78 emu/g, coercivity (Hc) =2058 Oe and magnetic saturation (σs) 45.16 emu/g.