不同粒径钡铁氧体空心微珠的自反应淬熄法制备及其吸波性能  

Preparation and Absorbing Properties of Barium Ferrite Hollow Microspheres with Different Particle Size by Self-reaction Quenching Technology

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：《人工晶体学报》2013年第10期2126-2132,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51172282)

摘　　要：以Al＋Fe2O3＋BaO2＋蔗糖＋环氧树脂为反应体系，运用将自蔓延高温合成技术、火焰喷涂技术与及快速冷却凝固技术相结合的自反应淬熄法，通过加入聚乙二醇发泡剂、不加发泡剂和加入NaNO3发泡剂三种方式，分别制备出粗径、中径和细径三种不同粒径的钡铁氧体空心微珠，研究了三种粒径空心微珠的形成机理和吸波性能。结果表明，发泡剂发气量的多少和熔滴的粘度共同决定了空心微珠粒径的大小。介电常数的实部ε′和复磁导率的实部μ′在0．5—7GHz间依次表现为中径〉细径〉粗径；介电常数的虚部ε″和复磁导率的虚部μ″在0．5～11．5GHz问依次表现为中径〉细径〉粗径。中径空心微珠最低反射率为-17．5dB，低于-10dB的吸收频带为11～14GHz，吸波性能优于粗径和细径空心微珠。将粗径和细径空心微珠按质量比1：1复合后，由于吸波单元的非连续化，空心微珠的吸波性能明显增强。Hollow multiphase ceramic microspheres containing barium ferrites were prepared under Al＋ Coarse and fine particle microspheres were obtained by adding polyethylene glycol and NaNO3, respectively. Medium particle microspheres were obtained without adding any foaming agent. The formation mechanism and microwave absorption properties were investigated. The results showed that, the particle size of microspheres is determined by the volume of gas and the viscosity of the droplets. The real part of permittivity （ε′） and complex permeability （μ′） are medium particles 〉 fine particles 〉 coarse particles in 0.5-7 GHz, and the imaginary part of permittivity （ε″） and complex permeability （μ″） are medium particles 〉 fine particles 〉 coarse particles in 0.5-11.5 GHz. The minimum value of reflectivity of the medium particle microspheres is - 17.5 dB and the frequency band lower than - 10 dB is 11-14GHz, whose microwave properties are better than those of coarse particle and fine particle microspheres. Due to the discontinuous microwave absorption units, the mixture of coarse particle and fine particle microspheres in a mass rate of 1：1 has an obvious improvement of microwave absorption properties.

关 键 词：空心微珠 粒径 吸波性能 钡铁氧体 自反应淬熄法 

分 类 号：J527[艺术—艺术设计] TB484.5[一般工业技术—包装工程]