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

被引：93

作者：

Zheng, Guopeng ^{[1
]}

Yin, Xiaowei ^{[1
]}

Liu, Shanhua ^{[1
]}

Liu, Xingmin ^{[1
]}

Deng, Juanli ^{[1
,2
]}

Li, Quan ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Shaanxi, Peoples R China

[2] Changan Univ, Sch Mat Sci & Engn, Xian 710072, Shaanxi, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2013年 / 33卷 / 11期

基金：

中国博士后科学基金;

关键词：

SiC; SiO2; Complex permittivity; Reflection loss; MICROWAVE DIELECTRIC-PROPERTIES; SIC POWDER; CONSTANT;

D O I：

10.1016/j.jeurceramsoc.2013.03.021

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Porous Si3N4-SiC composite ceramic was fabricated by infiltrating SiC coating with nano-scale crystals into porous beta-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 degrees 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 10 h in air can achieve a reflection loss of -30 dB (>99.9% absorption) at 8.7 GHz when the sample thickness is 3.8 mm. When the sample thickness is 3.5 mm, reflection loss of Si3N4-SiC/SiO2 is lower than -10 dB (>90% absorption) in the frequency range 8.3-12.4 GHz, the effective absorption bandwidth is 4.1 GHz. (c) 2013 Elsevier Ltd. All rights reserved.

引用

页码：2173 / 2180

页数：8

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