Synthesis and Characterization of Nd2Fe14B Powder by using Mechanical Milling of Flakes NdFeB

Abstract

Abstract Flakes NdFeB is one of type NdFeB alloy made and it was produced by strip casting method. Flakes NdFeB can be used as a raw material to produce sintered permanent magnet and it has about 0.2 – 0.3 mm in thickness. The flakes of NdFeB was milled by using High Energy Milling (HEM) machine and used a liquid toluene as milling media. The milling time was varried such as : 15, 30, 60 and 90 minutes. After milling, the samples were dried by using vacuum dryer at temperature 80°C under vacuum (10 mmbar) for 2 hours. The fine powder samples were analyzed crystall structure by using XRD, measured magnetic properties by using VSM and also measured particle size distribution (PSA). The characterization result show that the milling time gives an effect on the crystal structure and magnetic properties, where samples with milling time 60 dan 90 minutes has Fe phase as dominant phase and the Nd2Fe14B phase does not existing also the coercivity value tends to decrease until lower than 900 Oe. Samples with milling time about 15 and 30 minutes have Fe phase and Nd2Fe14B phase also they have corecivity value about 2000 – 2250 Oe. The means of particle size is achieved about 43.59 µm at sample with milling time 15 minutes.