プレセラミックス法によるフェライト系複合材料の作製と電波吸収特性

概要

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In order to develop wide-band microwave absorbers we tried to prepare composite absorbers consisting of magnetic loss (Ni-Zn-ferrite) and dielectric loss (SiC) materials. Dry or wet mixtures of Ni-Zn-ferrite and polycarbosilane (PCS) were cured in air and were then subjected to pyrolysis forming of the ferrite composites. The composites produced by the wet mixing had a granular structure: the PCS surrounding the ferrite particles suppressed the sintering and the grain growth of the ferrite composites during pyrolysis. The matching frequency due to the magnetic loss linearly increased with increasing PCS content. Moreover, the ferrite/SiC hemi-crystallized composite cured at 200℃ for 24 hours showed a wide-band absorption spectrum with both magnetic and dielectric losses.
社団法人日本磁気学会の論文
2002-06-01