Analisis Sifat Fisis, Magnet, dan Mikrostruktur Darivariasi Temperatur Sintering Barium Heksaferit Denganaditif SiO2

Abstract

Has waged manufacture of permanent magnet BaFe12O19 with the addition of additive composition variation SiO2 with 5 and 7 (wt%) use traditional methods of mechanical alloying by milling time 24 hours. The powder is then added to the adhesive Poly Vinyl Alcohol (PVA) and dry printed with a pressure of 30 kg / cm2 (8 kG). The printed form of pellets with an average diameter of 20 mm x 3 mm. Sintering process is then performed using a vacuum furnace at a temperature of 800o C, 900o C, 1000o C, and 1100o C were held for 2 hours. Samples were then characterized sintering which includes the characterization of physical properties (bulk density, porosity, Linear Shrinkage), the crystal structure was analyzed by XRD and Optical Microscope (OM), magnetized and measured curves histerisisnya. Characterization was conducted on the physical properties, namely density, porosity, and Linear Shrinkage by Archimedes method, and analysis of microstructures with used XRD and OM. As for the analysis of magnetic properties using permagraph measurement results that have been magnetized by the Gaussmeter. From the results of measurements of density and porosity magnet BaFe12O19 with SiO2 additives showed that the density values tend to increase, the porosity decreases in proportion to the amount of additive SiO2, and Linear shrinkage increases. From the results of the physical characterization obtained the best results in milling time is 24 hours at 1100o C on komposisi7% wt, with bulk density = 4.59 g / cm3, porosity = 21.03%, and Linear shrinkage = 11, 79 %. From one analysis XRD results indicate that no new crystal structures are formed, grainsize 15.6 has Br = 3.14 kG and Hc = 2,195kOe.