OPTIMASI PROSES PEMBUATAN
HARD-MAGNETIC
MATERIAL
BERBASIS BaFe
12O
19DENGAN ADITIF FeMn
ABSTRAK
Telah dilakukan pembuatan magnet dari magnet permanen Barium Heksaferit (BaFe12O19) dengan penambahan aditif Ferromangan (FeMn) variasi komposisi 3
dan 7 (%wt) menggunakan metode mechanical alloying. Serbuk BaFe12O19 dan
FeMn dimixing menggunakan HEM selama 15 menit (dry milling). Sampel dicetak dengan tekanan 40kgf/cm2 menggunakan magnetic field press dalam medan magnet sebesar 3,6 kG. Sampel disinter menggunakan High Temperature Furnace pada suhu 1100, 1150, 1200 dan 1250oC selama 2 jam. Sampel dikarakterisasi sifat fisis (bulk density, porositas), analisis mikrostruktur sampel menggunakan XRD, dan sifat magnet menggunakan VSM. Didapatkan bahwa pada penambahan aditif 3% wt. FeMn dengan suhu sintering 1200oC (2 jam) memiliki sifat fisis dan magnetik tertinggi dimana nilai bulk density sebesar 4,81 g/cm3, porositas sebesar 20%, nilai saturasi 63,49 emu/g, remanensi 31,45 emu/g, koersivitas 3 kOe, dan BHmax 630 kGOe.
Kata Kunci: BaFe12O19, FeMn, mechanical alloying, sintering
Process Optimation of Manufacture
Hard-Magnetic Material
BaFe
12O
19Based with FeMn Aditif
ABSTRACT
Has been done manufacturing of the magnet permanent Barium Hexaferrite (BaFe12O19) with the addition of additives Ferromanganese (FeMn) variations in
composition 3 and 7 (wt%) using the mechanical alloying method. Powder of BaFe12O19 and FeMn mixed using HEM for 15 minutes (dry milling). Samples
were pressed with pressure 40kgf/cm2 using a magnetic field press in 3.6 kG magnetic field. Samples were sintered using the High Temperature Furnace at 1100, 1150, 1200 and 1250oC for 2 hours. Samples were characterized on physical properties (bulk density, porosity), the microstructure analysis using XRD and magnetic properties using the VSM. It was found that the additive 3 wt. % FeMn with 1200oC as the sintering temperature (2 hours) ha s the highest magnetic and physical properties where the bulk density at 4.81 g/cm3, porosity at 20%, the saturation at 63.49 emu/g, remanence at 31.45 emu/g, coercivity at 3 kOe, and BHmax = 630 kGOe.
Keywords: BaFe12O19, FeMn, mechanical alloying, sintering
