Improved electromagnetic absorbing properties of Si3N4-SiC/SiO2 composite ceramics with multi-shell microstructure

Guopeng Zheng; Xiaowei Yin; Shanhua Liu; Xingmin Liu; Juanli Deng; Quan Li

doi:10.1016/j.jeurceramsoc.2013.03.021

Improved electromagnetic absorbing properties of Si₃N₄-SiC/SiO₂ composite ceramics with multi-shell microstructure

Guopeng Zheng, Xiaowei Yin, Shanhua Liu, Xingmin Liu, Juanli Deng, Quan Li

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

99 Scopus citations

Abstract

Porous Si₃N₄-SiC composite ceramic was fabricated by infiltrating SiC coating with nano-scale crystals into porous β-Si₃N₄ ceramic via chemical vapor infiltration (CVI). Silica (SiO₂) film was formed on the surface of rod-like Si₃N₄-SiC grains during oxidation at 1100°C in air. The as-received Si₃N₄-SiC/SiO₂ composite ceramic attains a multi-shell microstructure, and exhibits reduced impedance mismatch, leading to excellent electromagnetic (EM) absorbing properties. The Si₃N₄-SiC/SiO₂ fabricated by oxidation of Si₃N₄-SiC for 10h in air can achieve a reflection loss of -30dB (>99.9% absorption) at 8.7GHz when the sample thickness is 3.8mm. When the sample thickness is 3.5mm, reflection loss of Si₃N₄-SiC/SiO₂ is lower than -10dB (>90% absorption) in the frequency range 8.3-12.4GHz, the effective absorption bandwidth is 4.1GHz.

Original language	English
Pages (from-to)	2173-2180
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	33
Issue number	11
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2013.03.021
State	Published - Oct 2013

Keywords

Complex permittivity
Reflection loss
SiC
SiO

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10.1016/j.jeurceramsoc.2013.03.021

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title = "Improved electromagnetic absorbing properties of Si3N4-SiC/SiO2 composite ceramics with multi-shell microstructure",

abstract = "Porous Si3N4-SiC composite ceramic was fabricated by infiltrating SiC coating with nano-scale crystals into porous β-Si3N4 ceramic via chemical vapor infiltration (CVI). Silica (SiO2) film was formed on the surface of rod-like Si3N4-SiC grains during oxidation at 1100°C in air. The as-received Si3N4-SiC/SiO2 composite ceramic attains a multi-shell microstructure, and exhibits reduced impedance mismatch, leading to excellent electromagnetic (EM) absorbing properties. The Si3N4-SiC/SiO2 fabricated by oxidation of Si3N4-SiC for 10h in air can achieve a reflection loss of -30dB (>99.9% absorption) at 8.7GHz when the sample thickness is 3.8mm. When the sample thickness is 3.5mm, reflection loss of Si3N4-SiC/SiO2 is lower than -10dB (>90% absorption) in the frequency range 8.3-12.4GHz, the effective absorption bandwidth is 4.1GHz.",

keywords = "Complex permittivity, Reflection loss, SiC, SiO",

author = "Guopeng Zheng and Xiaowei Yin and Shanhua Liu and Xingmin Liu and Juanli Deng and Quan Li",

year = "2013",

month = oct,

doi = "10.1016/j.jeurceramsoc.2013.03.021",

language = "英语",

volume = "33",

pages = "2173--2180",

journal = "Journal of the European Ceramic Society",

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T1 - Improved electromagnetic absorbing properties of Si3N4-SiC/SiO2 composite ceramics with multi-shell microstructure

AU - Zheng, Guopeng

AU - Yin, Xiaowei

AU - Liu, Shanhua

AU - Liu, Xingmin

AU - Deng, Juanli

AU - Li, Quan

PY - 2013/10

Y1 - 2013/10

N2 - Porous Si3N4-SiC composite ceramic was fabricated by infiltrating SiC coating with nano-scale crystals into porous β-Si3N4 ceramic via chemical vapor infiltration (CVI). Silica (SiO2) film was formed on the surface of rod-like Si3N4-SiC grains during oxidation at 1100°C in air. The as-received Si3N4-SiC/SiO2 composite ceramic attains a multi-shell microstructure, and exhibits reduced impedance mismatch, leading to excellent electromagnetic (EM) absorbing properties. The Si3N4-SiC/SiO2 fabricated by oxidation of Si3N4-SiC for 10h in air can achieve a reflection loss of -30dB (>99.9% absorption) at 8.7GHz when the sample thickness is 3.8mm. When the sample thickness is 3.5mm, reflection loss of Si3N4-SiC/SiO2 is lower than -10dB (>90% absorption) in the frequency range 8.3-12.4GHz, the effective absorption bandwidth is 4.1GHz.

AB - Porous Si3N4-SiC composite ceramic was fabricated by infiltrating SiC coating with nano-scale crystals into porous β-Si3N4 ceramic via chemical vapor infiltration (CVI). Silica (SiO2) film was formed on the surface of rod-like Si3N4-SiC grains during oxidation at 1100°C in air. The as-received Si3N4-SiC/SiO2 composite ceramic attains a multi-shell microstructure, and exhibits reduced impedance mismatch, leading to excellent electromagnetic (EM) absorbing properties. The Si3N4-SiC/SiO2 fabricated by oxidation of Si3N4-SiC for 10h in air can achieve a reflection loss of -30dB (>99.9% absorption) at 8.7GHz when the sample thickness is 3.8mm. When the sample thickness is 3.5mm, reflection loss of Si3N4-SiC/SiO2 is lower than -10dB (>90% absorption) in the frequency range 8.3-12.4GHz, the effective absorption bandwidth is 4.1GHz.

KW - Complex permittivity

KW - Reflection loss

KW - SiC

KW - SiO

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U2 - 10.1016/j.jeurceramsoc.2013.03.021

DO - 10.1016/j.jeurceramsoc.2013.03.021

M3 - 文章

AN - SCOPUS:84877143296

SN - 0955-2219

VL - 33

SP - 2173

EP - 2180

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 11

ER -

Improved electromagnetic absorbing properties of Si₃N₄-SiC/SiO₂ composite ceramics with multi-shell microstructure

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Keywords

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