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材料工程  2019, Vol. 47 Issue (5): 122-128    DOI: 10.11868/j.issn.1001-4381.2018.000107
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
模板法制备MoSi2/竹炭复合材料及吸波性能
尚楷, 武志红, 张路平, 王倩, 郑海康
西安建筑科技大学 材料科学与工程学院, 西安 710055
Absorbing performance of MoSi2/BC composites using bamboo charcoal template
SHANG Kai, WU Zhi-hong, ZHANG Lu-ping, WANG Qian, ZHENG Hai-kang
College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
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摘要 以竹材炭化的多孔竹炭(BC)为模板,金属间化合物二硅化钼(MoSi2)为吸收剂,采用包埋硅(Si)粉固相烧结工艺制备MoSi2/BC多孔复合吸波材料。利用XRD、SEM和矢量网络分析仪对MoSi2/BC复合材料的物相组成、显微结构、介电和吸波性能进行表征。结果表明:在氩气(Ar)保护气氛下,1450℃烧结制备的MoSi2/BC复合材料主要含物相MoSi2、SiC及无定型碳。BC基体孔隙内除分布有MoSi2外,还布满排列无序、尺寸长短不一、相互交叉呈网状的碳化硅晶须(SiCW),SiCW的存在可有效提高复合材料电磁波吸收性能。在8.2~12.4GHz频率范围内,与环氧树脂混合后,复合材料反射率随MoSi2/BC含量增加而逐渐减小。MoSi2/BC含量为50%(质量分数)时,随试样厚度增加反射率降低,且最小反射率向高频方向移动;在11.87GHz处最低反射率为-13dB,反射损耗小于-10dB带宽约达1.0GHz,具有良好的吸波性能。
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尚楷
武志红
张路平
王倩
郑海康
关键词 复合材料MoSi2/竹炭吸波材料模板法介电性能    
Abstract:Using the bamboo charcoal(BC) material as the template, the metallic chemical compound MoSi2 as the absorption catalyst, the MoSi2/BC porous composite materials were fabricated by the embedded solid reaction sintering method. The components, microstructure and dielectric constant of the MoSi2/BC composite material were detected by XRD, SEM and vector network analyzer respectively. The results show that in the argon protective atmosphere(Ar), at the sintering temperature of 1450℃, the phase composition of MoSi2/BC composite material primarily consists of MoSi2, SiC and amorphous carbon. In the pores of the bamboo charcoal, the SiC whiskers(SiCW) are distributed in an irregular way with different size and length, furthermore to form an intersecting network except MoSi2 particles. The existence of SiCW can significantly improve the wave absorption ability. At the range of 8.2-12.4GHz, after mixed with epoxy resin, the reflection losses of the composites of MoSi2/BC are gradually decreased with the increase of MoSi2/BC content. With the increase of sample thickness at the MoSi2/BC 50%(mass fraction) content, the minimum absorption peak of reflection loss is moving to the low frequency. The composites' lowest reflection loss is -13dB at 11.87GHz, and the reflection bandwidth value below -10dB is around 1.0GHz.This ind-icates that the MoSi2/BC composites possess perfect microwave absorbing performance.
Key wordscomposites    bamboo charcoal/MoSi2 microwave absorbing materials    template mould method    dielectric property
收稿日期: 2018-01-25      出版日期: 2019-05-17
中图分类号:  TM25  
通讯作者: 武志红(1974-),男,副教授,博士,研究方向为高温结构材料及功能复合材料,联系地址:西安建筑科技大学材料科学与工程学院(710055),E-mail:zhihong@xauat.edu.cn     E-mail: zhihong@xauat.edu.cn
引用本文:   
尚楷, 武志红, 张路平, 王倩, 郑海康. 模板法制备MoSi2/竹炭复合材料及吸波性能[J]. 材料工程, 2019, 47(5): 122-128.
SHANG Kai, WU Zhi-hong, ZHANG Lu-ping, WANG Qian, ZHENG Hai-kang. Absorbing performance of MoSi2/BC composites using bamboo charcoal template. Journal of Materials Engineering, 2019, 47(5): 122-128.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000107      或      http://jme.biam.ac.cn/CN/Y2019/V47/I5/122
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