Effect Of Carbon Content On The Self-propagating High-temperature Synthesis Of NiCuZn-ferrite Powder

In this paper, NiCuZn ferrite powders were synthesized by self-propagating high-temperature synthesis (SHS). The carbon content effects on NiCuZn ferrite powders were discussed. NiCuZn high magnetic permeability ferrite material were prepared. In addition, studies on structures and properties of NiCuZn ferrite were carried out by various test technology and analysis methods, combustion process.At first, the relationship between the adiabatic combustion temperature and the carbon content was calculated according to thermodynamics and carbon combustion theory, providing a theoretical basis for the carbon content in the SHS process NiCuZn ferrite powder.Second, the effects of carbon powder content and oxygen pressure on SHS synthesis of NiCuZn ferrite powders were studied. The phase composition and microstructure of the NiCuZn powders were determined by X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM). It is found that when carbon content was 5 wt% and oxygen pressure was 0.2 MPa, the ferrite conversion rate of powder reaches the maximum.Finally, the effects of sintered temperature and doping on magnetic permeability of core were studied. The fracture microstructures, sintering density, initial permeability, power loss and residual magnetization of the samples were investigated by SEM and HP4194A impedance analyzer. In terms of NiCuZn ferrite powder synthesized by SHS with carbon powder, when the carbon content was 5 wt% and sintering temperature was 925°C, the initial permeability of NiCuZn ferrite powder synthesized by SHS was 2195, and sintering density was 5.13g/cm3.