Inten Natanael Simamora 110801065 ANALISIS SIFAT FISIS, MAGNET DAN MIKROSTRUKTUR DARI VARIASI TEMPERATURSINTERING BARIUM HEKSAFERIT DENGAN ADITIF SiO2
ABSTRAK
Telahdilakukanpembuatanmagnet permanen BaFe12O19 dengan penambahan aditif SiO2dengan mengggunakan metode mechanical alloyingdengan milling time 24 jam. SerbuktersebutkemudianditambahkanbahanperekatPoly Vinyl Alcohol(PVA) dan dicetak kering dengan tekanan 30 kgF/cm2 (8 kG). Hasil cetakan berupa pellet dengan diameter rata-rata 20 mm x 3 mm. Selanjutnyadilakukan proses
sinteringdenganmenggunakanvacuum furnace pada suhu 800oC, 900oC, 1000oC, dan
1100oC yang ditahanselama 2 jam. Sampel yang telah disintering kemudian dikarakterisasi yaitu meliputi karakterisasi sifat fisis (bulk density, porositas, linear
shrinkage) dengan menggunkan metode Archimedes, dianalisisstrukturkristalnyadengan
XRD dan Optical Microscope (OM), dimagnetisasidandiukurkurvahisterisisnya dengan permagrap.Dari hasil diketahui bahwa nilai densitas meningkat, porositas menurun sebandingdenganjumlah aditif SiO2, dan Linear Shrinkagemeningkat. Dari hasilkarakterisasi fisis diperolehhasil yang terbaikyaitupadamilling time 24 jam dengan suhu 1100oC pada komposisi 7 %wt, dengannilaibulkdensity = 4,59 gr/cm3,porositas = 21,03%, dan linear shrinkage = 11, 79 %. Dari salah satu hasilanalisaXRD menunjukkanbahwatidakterbentukstruktur kristal baru, grainsize 15,6memiliki Br = 3,14 kGdanHc = 2,195kOe.
ANALYSIS OF PHYSICAL PROPERTIES , MAGNETISM, AND THE MICROSTRUCTURES OF SINTERING TEMPERATURE VARIATION OF
BARIUM HEXAFERRITE WITH SiO2 ADDITIVE
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 800oC, 900oC, 1000oC, and 1100oC 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 1100oC 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.
