多孔陶瓷的導(dǎo)電相擔(dān)載與電磁性能研究
[Abstract]:Porous ceramics are of great significance in aviation, military, energy, chemical, metallurgical, environmental protection and many other fields. It is of great theoretical significance to study the negative permittivity and permeability of porous ceramics by adding new functional properties such as conductive, magnetic and other functional materials to porous ceramics. It has an important application background in the field of structural and functional integrated materials such as high power microwave tube attenuators. In this paper, ceramic matrix composites containing conductive phase were prepared by impregnation method on the carrier of alumina ceramics with high temperature, aging resistance and chemical stability and yttrium iron garnet ceramics with ferromagnetic properties. The negative permittivity and permeability are regulated by changing the type of matrix, the type of conductive phase, the composition and the microscopic morphology. The XRD,SEM,VSM,HP4991 impedance analyzer was used to test and analyze the composite materials. The factors influencing the electromagnetic behavior of the composites were studied by combining the percolation phenomenon, equivalent circuit and free electron model. Negative permittivity and negative permeability are realized in specific frequency band. Co/Al2O3,C/Al2O3 composites were successfully prepared by using porous alumina ceramics as substrate. In CO/Al2O3 composites, with the increase of cobalt content, the three-dimensional metallic cobalt network is gradually formed and uniformly distributed on the pore wall of alumina ceramics, and the electromagnetic properties of the composites have a sudden change near the percolation threshold. When the percolation threshold is higher than the percolation threshold, the negative dielectric is caused by the appearance of equivalent inductance. The negative permeability is caused by eddy current resonance of cobalt metal network and magnetic resonance. The chemical treatment of CO/Al2O3 composites can make the original granular cobalt become low-dimensional flake structure, and the destruction of cobalt network can make the negative dielectric phenomenon disappear, which indicates that the formation of three-dimensional cobalt network is very important to negative dielectric and negative permeability. In C/Al2O3 composites, a layer of carbon film structure was formed on the porous alumina pore wall after sucrose carbonization. With the increase of carbon content, the continuity and thickness of the film became stronger and thicker, resulting in the increase of conductive pathways in high frequency electromagnetic field. When the carbon content is 14 wt%, the permeability is diamagnetic because the plasmon resonance permittivity is negative. Co/YIG,C/YIG composites were successfully prepared from porous yttrium iron garnet ceramics. In CoA/YIG, with the increase of cobalt content, cobalt is gradually connected from granular to three-dimensional network to distribute uniformly on the wall of YIG pore. When the cobalt content is 35 wt%, the CoA / YIG composite exhibits double negative properties in the 575M-1G band. The negative permittivity is similar to that of Co/Al2O3, and the negative permeability is caused by domain wall resonance of matrix, magnetic spin resonance and eddy current resonance of three-dimensional conductive network. After carbonization, there are two kinds of carbon on the wall of YIG pore: granular and irregular lamellar. With the increase of carbon content, the conductivity of composites increases, negative dielectric appears and shows diamagnetism.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TQ174.1
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