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  

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

作　　者：蔡旭东[1] 王建江[1] 许宝才[1] 娄鸿飞[1] 侯永伸[1] 

机构地区：[1]军械工程学院先进材料研究所,石家庄050003

出　　处：《硅酸盐学报》2013年第10期1331-1338,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51172282);武器装备预研基金(9140A12-040211JB34)

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、1100℃）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Ba,Fe。201，和副产物相BaAl2O19含量之和逐渐升高，复介电常数的实部s’和虚部s”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1100℃时，空心微珠的最低反射率为-19．5dB，低于-10dB的频带为8．7～10GHz和15～17．3GHz，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 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 technol- ogy. 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 ~C） 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 ~C.The con- tent of main phases of BaFe12019 and the by-products of BaA112019 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 ~C, which are better than those at 600 and 850℃.

关 键 词：自反应淬熄法 热处理温度 六角晶 吸波性能 

分 类 号：TB333[一般工业技术—材料科学与工程]