Effect of Sintering Temperature to Physical, Magnetic Properties and Crystal Structure on Permanent Magnet BaFe12O19 Prepared From Mill Scale

2nd Materials Research Society of Indonesia Meeting

Ramlan^1 ; Muljadi^2 ; Sardjono, Priyo^2 ; Gulo, Fakhili^3 ; Setiabudidaya, Dedi^1

Physics Department FMIPA, Sriwijaya University, Palembang, Indonesia^1

Research Center for Physics, Indonesian Institute of Science, Indonesia^2

S3 MIPA Sriwijaya University, Palembang, Indonesia^3

关键词: Barium carbonate;    Firing shrinkage;    Hydraulic press;    Milling process;    Optimum conditions;    Sintered samples;    Sintering process;    Sintering temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/214/1/012009/pdf
DOI  :  10.1088/1757-899X/214/1/012009

来源: IOP

【 摘 要 】

Permanent magnet of Barium hexa Ferrite with formula BaFe12O19has been made by metallurgy powder method from raw materials : Barium carbonate (BaCO3E-merck) and Iron Oxide (Fe2O3from 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 : 1150°C, 1200°C, 1250°C and 1300°C 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 BaFe12O19does not change after sintering process, but the grain size tends to increase. The optimum condition is achieved at temperature 1250°C, 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.