Pzt-of Nicuzn Ferrite Electromagnetic Properties Of Composite Double Material Study

The continuous development of information society promotes the electronic components to the direction of small size, light weight, multi-functional and high stability. Thus put a variety of materials to carry out the special features composite, the component having a variety of functions has become the urgent needs of the market, it is become an important direction and hot spots to make the study of functional composite materials. At the present, the productions of many multi-functional components use LTCC (Low Temperature Co-fired Ceramic) technology. However, different dielectric layers rate mismatch between the densification rate, sintering shrinkage and thermal expansion, which restricts the industrialization process of cofired technology.In this thesis, the composite mechanism and the basic mechanisms of modification and low-temperature sintering of PZT-NiCuZn ceramic-ferrite composite materials have been analyzed. Then a series of novel materials and its preparation are explored and investigated. It is expected to become inductors, capacitors dual-performance materials. The main results are as follows:1. The effects of preparation process were researched on the microstructure and electromagnetic properties of ceramics. The pre-sintering temperature, sintering temperature are changed regularly to investigate the variation of the phase formation by X-ray diffraction studies, the micrographs of the sintered ceramics by SEM, and the bulk density by Archimedes method. The frequency dependence of complex permeability, quality factor, and dielectric constant are studied.2. With the systemically analyses of the synthesis of ferroelectric-ferromagnetic composite materials, the low temperature sintered NiCuZn ferrites and perovskite PZT was chosen as the main components. The ferroelectric-ferromagnetic composite material is synthesized by usual ceramic technology with NiCuZn ferrites and perovskite PZT as the main components. The microstructure and electromagnetic properties of the composite with different composition of NiCuZn ferrites and different perovskite contents are investigated. 3. Bi₂O₃ doped low temperature sintered PZT-NiCuZn ceramic-ferrite composite materials were also investigated in the aspects of the microstructure and magnetic properties. On the basis of Bi₂O₃ doping in a fixed amount, the effects of Co₂O₃-Bi₂O₃ co-additive on the microstructure and electromagnetic properties of low temperature sintering composite materials were investigated.4. Preparation of different methods of low temperature co-fired double-composite material performance was investigated. The effects of microstructure and electromagnetic properties also were study analysis by different style of preparations.5. The prepared PZT-NiCuZn composite materials were chosen to design the multilayer chip inductor,capacitance and anti-EMI filter. The ADS and HFSS software simulated circuit diagram and three-dimensional structure diagram of low pass filter. Through simulating and revising the model repeatedly, finally design the follow two low pass filters which packages are 0805 type size (2.0mm×1.3mm×0.8mm): A low pass filter was set up with cut off frequency is 10MHz, ripple within the passband below 0.5dB, attenuation exceed 40dB at 40MHz, another low pass filter was set up with cut off frequency is 50MHz, ripple within the passband below 0.5dB, attenuation exceed 20dB at 100MHz...