A New Technology for Preparing Fe-Al₂O₃ Magnetic Abrasive

Reduced iron powder and atomized iron powder were used as the magnetic phase,corundum powder as the abrasive,high temperature inorganic binder as the adhesive,the iron powder was modified,four different Fe-Al2O3 magnetic abrasives were prepared by sintering method.X-ray diffraction and SEM were used to anayze the morphology and phase components of the magnetic abrasives.Grinding performance of the magnetic abrasives were tested,and the influence of the type and surface modification of the iron powder on the properties of the magnetic abrasives were studied.The results indicate that the magnetic abrasives were mainly composed of α-Fe,Al2O3,Fe2O3,AlFeO3,(Al,Fe)7BO3(SiO4)3O3,and they were mainly irregular polyhedral particles.All the magnetic abrasives had good polishing ability and relatively long using time.The surface roughness of the ground samples could reach 0.15 μm and the using time was 24 min.Better finishing performance could be got using reduced iron powder and modified iron powder than using atomized iron powder and unmodified iron powder.