Pembuatan dan Karakterisasi Bonded Magnet Komposit Berbasis Polimer Deswita, Sudirman, Indra Gunawan

Abstract

Preparation of compositemagnets based on polymers with SrFe12O19 as filler have been conducted. Synthesis process was carried out by mixing powder of SrFe12O19 (SrM, M = Fe2O3) with epoxy and polyester polymer by ratio (in vol. fraction) of 30, 40, 50 and 60. The density of the sample was measured by Picno-meter method, where as the testing of mechanical properties was conducted with standard equipments of ASTM 412 and ISO R868 respectively. Microstructure and magnetic properties of the sample were measured by means of x-rays diffraction technique (XRD) and Vibrating Sample Magnetometer (VSM). The results showed that the highest density of the sample obtained about 3.3 gr/ml in SrM-epoxy composite with 50% content of SrM, where as highest tensile strength obtained about 297.23 kg/cm2 from SrM-epoxy with 39% content of SrM. The highest magnetic remanence (Br) and coercivity (Hc) was obtained of Br = 1.9 kGauss and Hc = 0.15 kOe from SrM-polyester composite magnet with 50% content of SrM. It can be concluded that composite SrM-
epoxy showed higher mechanical property than that of SrM-polyester composite. This shows that the epoxy polymer in composite magnetic materials which serves as a binder has a better property than polyester polymer for various filler content of SrM. But on the contrary, the nature of magnetism from a magnetic material of SrM-polyester composites is better than the SrM-epoxy.