PRODUCTION AND CHARACTERIZATION OF ALUMINA AND CARBONYL IRON POWDER BASED SINTERED MAGNETIC

Abstract

This project focused on compacting, sintering and characterizing of Alumina and Carbonyl iron powder. Al2O3 -CIP composites containing equal volume fraction of Al2O3 and CIP were prepared through powder metallurgy method. Powder metallurgy method is well developed method of manufacturing ferrous and non ferrous parts. Solid and liquid phase sintering was done on high temperature tubular furnace in the inert atmosphere of argon. Solid phase sintering was done at 1000°C and liquid phase sintering was done at 1545°C in proper sintering cycle. After sintering, the sintered pallets are crushed using ball mill for obtaining the required size. VSM is used to see the magnetization of the particles. The result shows that the saturation magnetization of sintered abrasive obtained at 9 ton compaction pressure is found to be highest. The different phases have been studied for all prepared samples using X-ray diffraction (XRD). The morphology and elemental composition as well as particle size has been studied using scanning electron microscope (SEM). Microstructure of samples has been studied using Optical microscope. Compression strength test was done for all samples by universal testing machine (UTM). Bulk density of the pallets was calculated using standard Archimedean testing. The result showed that the bulk density value increases with compaction load. Micro hardness for samples was measured using micro-Vickers hardness instrument and pallets produced at compaction pressure of 9 ton shows highest hardness.