Electrically conducting-inorganic substance-containing...

Details Electrically conducting-inorganic substance-containing... Electrically conducting-inorganic substance-containing...

2006-09-20

2010-12-07

Le, H. (Holly) T (Department: 1787)

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

C428S212000, C428S218000, C428S331000, C428S404000

Reexamination Certificate

active

07846546

ABSTRACT:
Silicon carbide-based fine particles containing an electrically conducting inorganic substance and a electromagnetic wave absorbing material, which are fine particles comprising a particle inner portion of a silicon carbide-based material and a surface layer formed of an electrically conducting inorganic substance mainly comprising carbon, wherein a gradient layer with the compositional ratio of the electrically conducting inorganic substance gradiently increasing toward the particle surface is present and the thickness of the electrically conducting inorganic substance gradient layer is from 1 to 500 nm. The electromagnetic wave absorbing material of the present invention can selectively absorb a electromagnetic wave of 1 to 300 GHz in a wide band.

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Bo Zhang et al., “Nanometer silicon carbide powder synthesis and its dielectric behavior in the GHz range”, Journal of the European Ceramic Society, (2002) pp. 93-99.
Saburo Sano et al., “Millmeter-Wave Absorption Measurement of Silicon Carbide Powder by Free-Space Method (Part 1)—Investigation of Measuring Method for Powder Sample-” , J.Jpn, Soc. Powder Metallurgy vol. 51, No. 1, 2004, pp. 37-42.

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