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Characteristics of Microwave Absorption of Ni-Zn-Ferrite/Sic Hemi-Crystallized Composites

Published online by Cambridge University Press:  18 March 2011

Makoto Nakanishi
Affiliation:
Department of Applied Chemistry, Okayama University, Tsushima-naka 3-1-1, Okayama 700-8530, Japan
Tomonori Shibuya
Affiliation:
Department of Applied Chemistry, Okayama University, Tsushima-naka 3-1-1, Okayama 700-8530, Japan
Tatsuo Fujii
Affiliation:
Department of Applied Chemistry, Okayama University, Tsushima-naka 3-1-1, Okayama 700-8530, Japan
Jun Takada
Affiliation:
Department of Applied Chemistry, Okayama University, Tsushima-naka 3-1-1, Okayama 700-8530, Japan
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Abstract

In order to develop wide-band microwave absorbers we tried to prepare composite absorbers between the magnetic loss (Ni-Zn-ferrite) and the dielectric loss (SiC) materials. The 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 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 the PCS content. Moreover the ferrite/SiC hemi-crystallized composite cured at 473 K for 24 hours showed wide-band absorption spectrum having the both magnetic and dielectric losses.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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