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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,1100℃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3.6GHz,优于未热处理、600、850℃热处理温度下的吸波性能。
The precursor hollow multi-phase ceramic microbeads were prepared by self-reaction quenching method combining flame thermal spraying technique, self-propagating high temperature synthesis technique and rapid cooling and solidification technique, and then the hollow phase ceramic barium ferrite Microbead microwave absorbing materials to study the influence of different heat treatment temperature (600,850,1 100 ℃) on the morphology, phase structure, phase relative content and microwave electromagnetic properties. The results show that with the increase of heat treatment temperature, the surface of hollow microbeads appears grains and grows up gradually, and the hexagonal phase appears at 1100 ℃. The main phase BaFe12O19 and the by-product phase BaAl12O19 And gradually increased, the real part ε ’and the imaginary part ε’ ’of the complex permittivity gradually decreased, and the real part μ’ and imaginary part μ ’of the complex permeability tended to increase in a certain frequency range. Pearl absorbing performance gradually increased. The lowest reflectance of Hollow Beads is -19.5 dB when the heat treatment temperature is 1100 ℃. The bandwidths below -10 dB range from 8.7 to 10 GHz and 15 to 17.3 GHz with a bandwidth of 3.6 GHz, , 850 ℃ heat treatment temperature absorbing properties.