Electromagnetic wave absorption characteristics, electrical resistivity and micro pore structure of woodceramics prepared by powder method

Masamichi Miki, Takeyuki Kikuchi, Shinji Inada, Michitaka Suzuki, Jun Takada

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Electromagnetic wave absorption characteristics, electrical resistivity and micro pore structure (specific surface area and micro pore size distribution) of the powder-method woodceramics, which were prepared by carbonizing the compacted mixtures of wood powder and 10- 30mass% of phenolic resin powder, were examined in comparison with those of the conventional MDF-method woodceramics, which were prepared by carbonizing the medium density fiber (MDF) boards impregnated with phenolic resin solution. The powder-method woodceramics carbonized at 650°C showed remarkable electromagnetic absorption characteristics as same as MDF-method woodceramics, namely the absorption values of 10%, 20% and 30% phenolic resin specimens were 35 dB at 11 GHz, 40 dB at 9 GHz and 50 dB at 2 GHz, respectively. These remarkable absorptions were mainly due to the suitably high electrical resistivities (101-10 3Ωcm) of these woodceramics. The specific surface area of these woodceramics became to the maximum in the case of the carbonization at 700°C, namely 380m2·g-1 in the 30% phenolic resin powder specimen, 300m2·g-1 in the MDF specimen and 230m2 · g-1 in the 10% phenolic resin powder specimen, respectively.

Original languageEnglish
Pages (from-to)124-130
Number of pages7
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume52
Issue number2
DOIs
Publication statusPublished - Feb 2005

Keywords

  • Carbon
  • Electrical resistivity
  • Electromagnetic wave absorption
  • Specific surface area
  • Woodceramics

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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