Preparation, microwave properties of mullite ceramic and their effects on microwave absorbing materials

Fu Kuan Zhang, Fa Luo, Dong Mei Zhu, Wan Cheng Zhou

科研成果: 期刊稿件文章同行评审

6 引用 (Scopus)

摘要

Mullite ceramic is prepared by hot-pressing method from a mixture of SiO2 sol and Al2O3 sol and from a mixture of SiO2 and Al2O3 powders respectively. The relationships between permittivities and sintering conditions of mullite ceramic are discussed. The sample permittivities are measured in the frequency range of 8.2-12.4 GHz. The results show that the real and imaginary parts of permittivities of the samples increase with the sintering densities. The real and imaginary parts of permittivity of the samples increase when additive MgO is used. Mullite ceramics with different permittivities can be obtained through varying their preparation conditions. When the as-formed mullite ceramic is used as an impedance transfer layer of the microwave absorbing material, it greatly enhances the microwave absorbing efficiency of absorbing materials. The mechanism of the enhancement of absorbing efficiency is that the addition of mullite ceramic to an absorbing material lowers the interface reflection between air and the absorbing material, more microwave enters the absorbing material and is dissipated. There exist different effects from ceramics which are prepared under different conditions. So an exact preparation condition of the mullite ceramic is required for expected characteristics of the microwave absorbing material.

源语言英语
页(从-至)250-253
页数4
期刊Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica
26
2
出版状态已出版 - 3月 2005

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