Pembuatan Magnet Permanen NdFeB/FeMn dengan Metode Mechanical Alloying.

Abstract

The manufacture of NdFeB magnetic powder type MQ-A and FeMn as the base material for making permanent magnets. The process of making NdFeB magnetic material powder with FeMn additive powder. Variations of FeMn addition were performed with a 0.5: 1: 3: 5: and 10 wt% additive composition. Powdered NdFeB / FeMn using HEM with toluene medium and 10: 1 gram ratio of powder and powder. The milling time with HEM is set by 15 minutes and 30 minutes. Preparation of NdFeB / FeMn bonded magnets using compacts with cylinder molds with a diameter of 2 cm and a print pressure of 310 MPa for 3 minutes. With the addition of 3 wt% of epoxy resin and 2 drops of catalyst as adhesive and drying agent. Samples that have been printed then dicuring with under vacuum dryer with temperature 1500C for 2 hours with a pressure of 10 mbar. The tested characteristics include physical properties of density, crystal structure using X-Ray Diffractometer and magnetic properties using Gaussmeter and Vibrating Sample Magnetometer. Observation of microstructure with Scanning Electron Microscope. Analysis of particle size of powder with Particle Analyzer Analysis. The results showed that the addition of 5 wt% FeMn on NdFeB powder 30 minutes mined increased the product energy value (BH-Max). Value of BH max = 4.11 MGOe, Hc = 1.73 kOe, Mr = 26.26 emu / g and Ms = 93.11 emu / g. The highest magnetic flux value of 441.4 Gauss was obtained at the addition of 5 wt% FeMn with 30 minutes milling.