High Performance Study Of Low Temperature Co-firing Nicuzn Ferrite And Its Device

In today’s, the miniaturization, lighter, high-frequency and multi-functional ofelectronic devices have become an inevitable trend, which has made the LowTemperature Co-fired Ceramic （LTCC） technology become a hot research topic ofcurrent and recent research. With the improvement of thinking highly and applicationneeds of LTCC technology in domestic, LTCC components have been developed intothe localization gradually. But in domestic, the high-performance low-temperatureco-fired ferrite materials have become an urgent problem in the development of LTCCcomponents. In order to circumvent this problem, two kinds of low-temperatureco-fired NiCuZn ferritewe have been researched, which are LT50and LT250, and havebeen used in the fabrication of LTCC filter successfully.In the part of material LT50, first of all, under the premise of mixing with1wt%of Bi₂O₃, we substitute Fe with Nb in the formula of Ni0.38Cu0.28Zn0.34Fe2O4, thismethod has made material to identification with the sintering tempreture at900℃;Then micro-adjust the flux Bi₂O₃content, the material properties have beensynthesized; furthermore, materials have been prepared by doping Co2O3, in order toachieve high quality factor of the material, the results show that the Q value of thesample reach171at5MHz, when the material mixed with1.2wt%Co2O3; Finally, wehave researched the properties of the materials in different calcining temperature andthe sintering temperature, and verify the temperature stability of the material.In the part of material LT250, firstly, Zn is substituted by Cu in the formula ofNi0.25Cu0.15+0.02xZn0.6-0.02xFe1.98O4, we have investigated the properties of the material,and determined the optimal Cu content of x=2; Secondly, in order to sinteringtemperature down to900°C, the low melting point glass fluxing Bi₂O₃-B₂O₃-SiO₂-ZnO（BBSZ） has been added into the material; Thirdly, the composite doping of Co₂O₃andV₂O₅in the materials have been investigated, the studies have shown that the materialcan take into account the high initial permeability and high quality factors, whendoping total of0.3wt%, the ratio of Co₂O₃: V₂O₅=3:1, Finally, the study material properties at different pre-burn the trend of changes in temperature and sinteringtemperature, verify that the temperature stability of the material.LTCC filter design and production, the use of independent research and LT50types of materials, and successfully resolved the compatibility issue with the dielectricmaterial; designed cut-off frequency of15MHz band rejection of15dB at30MHzlow-pass filter; preparation out of the filter, the test cut-off frequency of16MHz,30MHz band suppression to achieve17dB, in line with the performance of the filterdesign, validation of our independent research and development of low temperaturesintered ferrite materials in the fabrication of the LTCC filter availability.