热处理温度对空心复相陶瓷微珠结构与微波电磁性能的影响_中国硅酸盐学会 - 精品期刊
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热处理温度对空心复相陶瓷微珠结构与微波电磁性能的影响
2013-11-14 | 编辑:enablesite | 【

蔡旭东,王建江,许宝才,娄鸿飞,侯永伸
(军械工程学院先进材料研究所,石家庄 050003)

摘  要:利用将火焰热喷涂技术、自蔓延高温合成技术及快速冷却凝固技术结合在一起的自反应淬熄法制备了前驱体空心复相陶瓷微珠,然后通过热处理获得了钡铁氧体空心复相陶瓷微珠吸波材料,研究不同热处理温度(600、850、1 100 ℃)对其形貌、相结构、相的相对含量与微波电磁性能的影响。结果表明:随着热处理温度的升高,空心微珠的表面出现晶粒并逐渐长大,发育逐步充分,1 100 ℃时出现明显的六角晶型物相;主相BaFe12O19和副产物相BaAl12O19含量之和逐渐升高,复介电常数的实部ε′和虚部ε′′逐渐降低,复磁导率的实部μ′和虚部μ′′在一定频段范围内有增大趋势;空心微珠吸波性能逐步增强。当热处理温度为1 100 ℃时,空心微珠的最低反射率为–19.5 dB,低于–10 dB的频带为8.7~10 GHz和15~17.3 GHz,带宽达到3.6 GHz,优于未热处理、600、850 ℃热处理温度下的吸波性能。

关键词:自反应淬熄法;热处理温度;六角晶;吸波性能
中图分类号:TB333    文献标志码:A    文章编号:0454–5648(2013)10–1331–08
网络出版时间:2013–09–24  18:23:01    网络出版地址:http://www.cnki.net/kcms/detail/11.2310.TQ.20130924.1823.004.html

Effect of Heat-treatment Temperature on Structure and Microwave Electromagnetic Properties of Hollow Multiphase Ceramic Microspheres

CAI Xudong,WANG Jianjiang,XU Baocai,LOU Hongfei,HOU Yongshen
(Institute of Advanced Materials, Ordnance Engineering College, Shijiazhuang 050003, China)

Abstract: The precursor of the hollow multiphase ceramic microspheres were obtained by a self-reactive quenching process based on the flame hot spraying technology, the self-propagating high-temperature synthesis (SHS) technology and the quick chilling technology. The microwave absorbing materials of the hollow microspheres containing barium ferrites were subsequently prepared after heat-treatment. Effect of heat-treatment temperature (i.e., 600, 850, 1 100 ℃) on the morphology, the phase structure, the relative content of the phases and the microwave absorption properties of the hollow microspheres was investigated. The results show that the grain size on the surface of the hollow microspheres increases gradually with the increase of heat-treatment temperature. The spheres are constituted by crystals for hexagonal like platelet with the sub-micron sizes when heat-treatment temperature is 1 100 ℃.The content of main phases of BaFe12O19 and the by-products of BaAl12O19 increase with increasing heat-treatment temperature. In addition, the real part (ε′) and the imaginary part (ε′′) of the complex dielectric constant decrease, and the real part (μ′) and the imaginary part (μ′′) of the complex magnetic permeability increase in certain frequency bands. Moreover, the microwave absorption properties increase. The minimum reflectivity is –19.5 dB, the frequency band of < 10 dB is 8.7–10 GHz and 15–17.3 GHz and the band width is 3.6 GHz at 1 100 ℃, which are better than those at 600 and 850 ℃.

Key words: self-reactive quenching technology; heat-treatment temperature; hexagonal crystal; microwave absorption properties

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