Efek Milling Time Terhadap Sifat Fisis dan Mikrostruktur dari Serbuk BaFe12O19 dengan Al2O3 Sebagai Aditif

Abstract

Manufacture of permanent magnet made by mixing powder BaFe12O19 amorphous Al2O3, which is an insulator in the form of crystal called korondum , having density values of 3.96 g / cm3 , a melting point of 2050 0C and hardnes from 1500 to 1800 kgf / mm2 as doping, with a composition of 93: 3% Wt to get a strong magnet. Do mixing and milling using Planetary Ball Mill (PBM), the mixing is done using the dry method of mixing and milling, the mixture dimixing and dimilling with variable time of 12 hours, 24 hours, 36 hours and 48 hours with a speed of 15 rpm of PBM rad / min. From the data obtained a PSA some variation of the smallest particle size of 9.71 microns with a milling time of 48 hours. The physical properties are true density test, with the highest value obtained true density of 4.383 (g / cm3) at 48 hours milling time, and a true increase in density obtained in 24-36 hours milling time by 0.09%. Microstructure viewed using XRD , BaFe12O19 and Al2O3 found some highest peaks. After milling 24 and 48 hours peaks were found only peak BaFe12O19