複合セラミックスを用いた二層構造広帯域電磁波吸収体の作製と特性評価

概要

論文の詳細を見る
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.
社団法人粉体粉末冶金協会の論文
2007-02-15