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181905-掺镁六角晶系钡铁氧体/环氧树脂复合材料的吸波性能

   日期:2018-11-06     作者:熊旋,曾国勋,等    浏览:21    评论:0    
核心提示:中文核心期刊,中国科技核心期刊! DOI: 10.19289/j.1004-227x.2018.19.005掺镁六角晶系钡铁氧体/环氧树脂复合材料的吸波性能熊

中文核心期刊,中国科技核心期刊!


DOI: 10.19289/j.1004-227x.2018.19.005

掺镁六角晶系钡铁氧体/环氧树脂复合材料的吸波性能

熊旋1, 2,曾国勋1,张海燕1, *,李学易2(1.广东工业大学材料与能源学院,广东 广州 5100062;

2.广东工业大学信息工程学院,广东 广州 5100062)

摘要:采用柠檬酸和硝酸盐以溶胶−凝胶燃烧法制备了掺镁Y 型六角晶系钡铁氧体Ba2Mg2Fe12O22(Mg2Y)无机前驱体,将其分别置于900、1 000、1 050 和1 100 °C 下煅烧,所得铁氧体与E44 环氧树脂及EP 固化剂均匀混合,得到一种Mg2Y 型钡铁氧体/环氧树脂复合材料。用X 射线衍射仪和扫描电镜表征了前驱体粉末煅烧前后的物相结构和显微形貌。通过用矢量网络分析仪测试复合材料在X 和Ku 波段的电磁参数,考察了煅烧温度及厚度对复合材料吸波性能的影响。前驱体在1 050 °C 下煅烧5 h 能形成单一结构的Y 型铁氧体,用其制备的厚度为2.0 mm 的复合材料具有最佳的吸波性能:介电损耗高,在X 和Ku 波段均有较好的吸收,反射损耗峰值为−16 dB,反射损耗小于−10 dB 的有效带宽达到4.1 GHz。

关键词:钡铁氧体;六角晶系;镁掺杂;溶胶−凝胶燃烧法;煅烧;环氧树脂;吸波;电磁损耗

中图分类号:TB34 

文献标志码:A 

文章编号:1004 – 227X (2018) 19 – 0885 – 05

Microwave absorbing property of magnesium-doped Y-type barium hexaferrite/epoxy resin composite// XIONG Xuan, ZENG Guo-xun, ZHANG Hai-yan*, LI Xue-yi

Abstract: An inorganic precursor particle of magnesium-doped Y-type barium hexaferrite i.e. Ba2Mg2Fe12O22 (Mg2Y) was synthesized by a sol–gel combustion method using citric acid and nitrates, and then calcined at 900, 1 000, 1 050, and 1 100 °C, respectively. The hexaferrite was uniformly blended with E44 epoxy resin and EP curing agent, forming a Mg2Y-type barium hexaferrite/epoxy resin composite. The phase structure and micro-morphology of the precursor particles before and after calcination were characterized by X-ray diffraction and scanning electron microscopy, respectively. The effects of calcination temperature and thickness of the composite on its microwave absorption property were evaluated based on the electromagnetic parameters measured using a vector network analyzer at X and Ku bands. A single-phase Y-type ferrite with an uniform structure is formed by calcining the precursor at 1 050 °C for 5 h, and the 2 mm-thick composite prepared therewith has the optimal microwave absorption properties, as shown by a high dielectric loss, a good absorption at X and Ku bands, a maximum reflection loss of −16 dB, and a frequency bandwidth of 4.1 GHz when the reflection loss is below −10 dB.

Keywords: barium ferrite; hexagonal structure; magnesium doping; sol–gel combustion; calcination; epoxy resin;microwave absorption; electromagnetic loss

First-author’s address: School of Materials and Energy, Guangdong University of Technology, Guangzhou 510062,China

PDF全文下载,请点击   1819005_0885-0889_185906.pdf

 
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