Pembuatan dan Karakterisasi Semi-Hard Magnetic Fe2o3 Berbasis Mill Scale Limbah Industri Baja dengan Penambahan Femo

Abstract

Synthesis and characterisation magnetic material based on mill scale with 1, 3, 5, 7 and 9% wt FeMo addition has been done. The raw material of mill scale milled using Planetary Ball Mill (PBM) while FeMo milled using High Energy Milling (HEM) in wet milling method. And then XRF analysed has done and show the element compiler of mill scales are 98.7% iron and the other element are Mn, Si, Al, Cr, Nb and Cu. while the compiler of FeMo are 60.3% Molybdenum, 38,5% iron and there are Al, Si, Cu and Ni. Mixing process of mill scale and FeMo powder has done using HEM for 15 minutes. The true density measurement was done and the value range 5.63 – 5.93 g/cm3as the result, while VSM measurement got the coercivity about 402.64 – 442.13 g/cm3. After that, the mixed powder of mill scale and FeMo calcined at 900oC for 2 hours. And the analisys of XRD shown a single phase namely hematite (F2O3) and VSM measurement got the coercivity about 2.2 – 2.3 kOe. Than, the powder were calcined pressed with 70kgf/cm2for 2 minutes and sintered at 1150oC and 1250oC for 2 hours. The bulk density and porosity measurement show that optimum condition when the sample sintered at 1250oC and The XRD characterisation of sample sintered at 1250oC show that the phases is not change with coercivity about 0.7 – 1.2 kOe, when added 1, 5 and 9 wt % FeMo and it is conclude into semi-hard magnetic materials and can be applied as magnetic sensor and telecomunication devices. When 7 wt % FeMo added, it produced hard magnetic and can be applied as electric motors for watches and computer, printers, galvanometer, loudspeaker, microphone and Nuclear Magnetic resonance (NMR).