Pengaruh Temperatur Sintering terhadap Sifat Fisis, Magnet dan Mikrostruktur dari Bafe12o19 dengan Aditif Al2o3

Abstract

Has waged manufacture permanent magnets BaFe12O19 with Al2O3 additive is added to the composition variation 1 and 3 (wt%) use traditional methods of mechanical alloying by milling time of 48 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 8000C, 9000C, 10000C, and 11000C were held for 2 hours. Samples were then characterized sintering physical properties (bulk density, porosity, Linear Shrinkage), analyzed the crystal structure 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 a micro-structure analysis using 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 Al2O3 additive shows that the density values tend to increase, the porosity decreases in proportion to the amount of additive Al2O3, and Linear shrinkage increases. From the results of the physical characterization is obtained the best results in milling time of 48 hours at a temperature of 11000C at 3% wt composition, with a bulk density = 4.90 g / cm3, porosity = 20.55%, and 10.51% Linear Shrinkage, From one of the results of XRD analysis showed that the crystal structure has been formed BaFe12O19 and BaAlFe11O19, grainsize 15.7, has Br = 3.22 kG and Hc = 4.013 Koe.