The. Of Nicuzn Ferrite

People have studied ferrite for many years since it is found. Ferrite is a group of nonmetal magnetic materials , which are applied exclusively in many fields such as soft magnetic , gyrate magnetic etc.In this paper, NiCuZn ferrites have been prepared using the traditional solid-state mixing method. Toroidal samples were obtained after being ball-milled, calcinated, granulated, formed and sintered. The effects of additive, calcining temperature, grain size, forming and sintering etc on the magnetic properties of NiCuZn ferrites were investigated and the forming and sintering technology was innovated and improved based on the above investigation. The impact of the factors iscussed above on the magnetic properties of NiCuZn ferrites was assessed by using XRD, SEM and optical microscopy to investigate the microstructure of the ferrites. The results showed that the shrinkage ratio is big when the calcinated extent too low and abnormal grain growth appears when the calcinated extent too excessive; proper quantities of Bi2O3 or PdO can promote the grain growth of the ferrite and increase the permeability effectively; the green density increases with the raise of the forming pressure; the samples should be heat treated at 350-4000C for 2 hours in order to completely eliminate the PVA; to raise th. e sintering temperature and extend the sintering time properly is favorable to the: grain growth and densification of the ferrites so as to the improvement of magnetic; properties of the NiCuZn ferrite' s. reseaches on ferrite are mainly in two aspects: one is study on the nanoparticle or film ferrite of its preparation method, lattice structure and different magnetic properties from bulk material. The other is the fabrication and magnetic properties of different cat ions substitute. Especially much attention havebeen paid in Ni-Zn, Mn-Zn ferritc in the nearest years.