Abstract
A wide-band electromagnetic wave absorber was developed using a double-layered monolith consisting of high- and low-permeability (μr) composite ceramics. The low-μr layer was formed from a powder mixture of Ni0.7Zn0.1Cu0.2Fe2O4 and SiO2-based glass. Ferrite mixtures of low-firing Ni0.2Zn0.6Cu0.2Fe2O4 and Ni0.3Zn0.7Fe2O4 with less sinterability were used to adjust the densification characteristics of the high-μr layer. Co-firing of green compacts of the ferrite: glass powder (90:10% in mass-base) for the low-μr layer and low-firing ferrite: less-sinterable ferrite (60:40% in mass-base) for the high-μr layer resulted in the production of a monolithic double-layered ceramic at 1100°C. Scanning electron microscopy and electron microprobe analysis of the monolithic double-layered ceramic showed that Ni-Zn interdiffusion and glass diffusion occurred across the layer boundary, leading to the diffusion bonding. An absorption band of the double-layered absorber was more than 10 dB in a wide frequency range from 6 MHz to 1.8 GHz.
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