Fabrication and electromagnetic interference shielding effectiveness of Ti₃Si(Al)C₂ modified Al₂O₃/SiC composites

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• 作者：Ning Dong ; Lingqi Chen ; Xiaowei Yin ; ^{yinxw@nwpu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaokang Ma ; Xinnan Sun ; Laifei Cheng ; Litong Zhang
• 关键词：Al2O3/SiC ; Ti3Si(Al)C2 ; Reactive melt infiltration ; Electrical conductivity ; Electromagnetic interference shielding effectiveness
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：9448-9454
• 全文大小：2104 K

文摘

A dense alumina fiber reinforced silicon carbide matrix composites (Al₂O₃/SiC) modified with Ti₃Si(Al)C₂ were prepared by a joint process of chemical vapor infiltration, slurry infiltration and reactive melt infiltration. The conductive Ti₃Si(Al)C₂ phase introduced into the matrix modified the microstructure of Al₂O₃/SiC. The refined microstructure was composed of conductive phase, semiconductive phase and insulating phase, which led to admirable electromagnetic shielding properties. Electromagnetic interference shielding effectiveness (EMI SE) of Al₂O₃/SiC and Ti₃Si(Al)C₂ modified Al₂O₃/SiC were investigated over the frequency range of 8.2–12.4 GHz. The EMI SE of Al₂O₃/SiC-Ti₃Si(Al)C₂ exhibited a significant increase from 27.6 to 42.1 dB compared with that of Al₂O₃/SiC. The reflection and absorption shielding effectiveness increased simultaneously with the increase of the electrical conductivity.