Fabrication and Characterization of Double-layered Wide-band Electromagnetic Wave Absorber Consisting of Composite Ceramics

• Abe Kazutomo

  Graduate School of Engineering, Hokkaido University

• Kitahara Naoto

  Factory of engineering, Tokyo Polytechnic University

• Sugiyama Daiju

  Factory of engineering, Tokyo Polytechnic University

• Morifuji Fumiko

  Factory of engineering, Tokyo Polytechnic University

• Higuchi Mikio

  Graduate School of Engineering, Hokkaido University

• Takahashi Junichi

  Graduate School of Engineering, Hokkaido University

Bibliographic Information

Other Title

• 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
• フクゴウ セラミックス オ モチイタ ニソウ コウゾウコウタイイキ デンジハ キュウシュウタイ ノ サクセイ ト トクセイ ヒョウカ

Abstract

A wide-band electromagnetic wave absorber was developed using a double-layered monolith consisting of high- and low-permeability (μ_r) composite ceramics. The low-μ_r layer was formed from a powder mixture of Ni_0.7Zn_0.1Cu_0.2Fe₂O₄ and SiO₂-based glass. Ferrite mixtures of low-firing Ni_0.2Zn_0.6Cu_0.2Fe₂O₄ and Ni_0.3Zn_0.7Fe₂O₄ with less sinterability were used to adjust the densification characteristics of the high-μ_r layer. Co-firing of green compacts of the ferrite: glass powder (90:10% in mass-base) for the low-μ_r layer and low-firing ferrite: less-sinterable ferrite (60:40% in mass-base) for the high-μ_r 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.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 54 (2), 86-92, 2007

  Japan Society of Powder and Powder Metallurgy

Keywords

• electromagnetic wave absorber
• co-firing
• composite ceramics
• ferrite
• SiO<SUB>2</SUB>-based glass

Details

• CRID: 1390282681283589376
• NII Article ID: 10018736729
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.54.86
• COI: 1:CAS:528:DC%2BD2sXjt1Cqt7Y%3D
• ISSN: 18809014
• ISSN: 05328799
• NDL BIB ID: 8727842
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8727842
• Web Site: https://www.jstage.jst.go.jp/article/jjspm/54/2/54_2_86/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed