Fabrication of Magnetic Ink Chromium Ferrite Using Iron Sand

Abstract

In this research iron sand was used as raw material for fabrication of magnetic ink of chromium ferrite. The first step of research was synthesizing iron sand into pigment of chromium ferrite using powder metallurgy method. The second step was processing pigment into magnetic ink. The ink was produced by mixture pigment into binder solution of polyvinyl alcohol and heated. While stirring the mixture was added alcohol as a solvent and additives of polyethylene glycol, propylene glycol, and glycerine by certain composition. The variation of pigment mass was 6 g, 8 g, 10 g, 12 g, 14 g, and 14 g. The produced ink was characterized its properties, those were structure using XRD method, colour, density, viscosity, organoleptic, CCD microscope, and magnetic susceptibility. Using XRD was found that the pigment have a structure of CrO.Fe2O3 with size of 84.81nm. The colour of ink was dark green. The brightness of the ink decreases with increasing pigment mass. The coordinates values of a∗ and b∗ was fluctuated. The ink viscosity was around 7.64 cP until 19.59 cP, the density was around 0.954 gr/cm3 until 1.007 gr/cm3. By organoleptic study was found that the ink can be used on the whiteboard. From CCD microscope was known that distribution of ink more evenly white increasing of pigment mass. The value of magnetic susceptibility was around of 1.500175×10-5 m3/kg until 1.504662×10-5 m3/kg.