Research On The Preparation Of Power NiCuZn Ferrite Materials By Low-temperature Sintering

Modern weaponry,aviation,aerospace engineering,etc.have increasingly stringent requirements for the volume,weight and performance of electronic systems,and electronic components and components are developing in the direction of small,light,thin,high reliability and high performance.For the small and lightweight electronic system,in the field of passive components,low temperature co-fired ferrite（LTCF）technology is the mainstream technology to achieve the integration of passive magnetic components,this paper for the LTCF technology urgently needed low-temperature sintered NiCuZn ferrite materials to study,low-temperature sintered power NiCuZn ferrite preparation,promote the miniaturization and high frequency of LTCF devices.Firstly,in order to realize the co-sintering of NiCuZn ferrite material with silver electrode at about 900℃,V₂O₅and Bi₂O₃fluxes were selected for research.The results show that appropriate amounts of V₂O₅and Bi₂O₃can not only promote the sintering reaction,reduce the sintering temperature,but also improve the high-frequency loss of ferrite.In the V₂O₅additive study,0.5 wt%V₂O₅obtained the lowest total loss,with a power loss density of 286 k W/m³（1 MHz 30 m T）.In the study of Bi₂O₃,0.225 wt%Bi₂O₃obtained the lowest total loss,and the power loss density was 373 k W/m³（1 MHz30 m T）,compared with V₂O₅for loss improvement.Based on the research of the two fluxes,Bi₂O₃with 0.225 wt%and Ca CO₃and V₂O₅with 0.5 wt%,and two additives with high melting points,Ca CO₃and Ba Ti O₃（BTO）,were selected for binary compound doping.Experiments show that with the addition of Ca CO₃and Ba Ti O₃,the density,initial magnetic permeability and saturation magnetic induction intensity of NiCuZn ferrite are constantly decreasing,and the power loss density shows a trend of first decreasing and then rising.By comparing all NiCuZn doped NiCuZn ferrites,NiCuZn ferrites doped with 0.5 wt%V₂O₅and 0.03 wt%BTO achieved the lowest high-frequency loss,and its power loss density was 212 k W/m³（1 MHz 30 m T）.Finally,in terms of the preparation process of materials,the paper mainly studies the pre-sintering temperature and sintering temperature of NiCuZn materials,and selects six pre-sintering temperature points of 775℃,800℃,825℃,850℃,875℃ and 900℃ for research in the pre-sintering temperature study,and the results show that with the increase of pre-sintering temperature,the sintering density and initial permeability decrease,and the power loss density is the lowest value of 775℃.In the sintering temperature study,four temperature points of 860℃,880℃,900℃ and920℃ were selected for investigation,and the additives were selected 0.225 wt%Bi₂O₃,0.08 wt%Ca CO₃and 0.5 wt%V₂O₅and 0.03 wt%BTO for two groups of experiments,the results showed that with the increase of sintering temperature,the density and saturation magnetic induction intensity of ferrite first increased and then remained stable,and the power loss density decreased first and then increased.The NiCuZn ferrite prepared at a sintering temperature of 900℃ had the best performance.