自反应淬熄法制备锶钡铁氧体空心微珠吸波材料及其表征  

Preparation and Characterization of Strontium-Barium Ferrite Hollow Microspheres by Self-reactive Quenching Method

作　　者：高海涛[1] 王建江[1] 许宝才[1] 娄鸿飞[1] 蔡旭东[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》2014年第7期1838-1843,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51172282);武器装备预研基金项目(9140A12040211JB3402)

摘　　要：采用低温自反应淬熄法结合热处理工艺,以Fe(NO3)3+Ba(NO3)2+Sr(NO3)3+CO(NH2)2为反应体系,成功制备了微纳米锶钡铁氧体空心微珠。采用SEM、XRD、网络矢量分析仪等对样品的形貌、相组成和电磁参数进行了表征和测量,并分析了空心微珠形成机理及电磁特性。结果表明:淬熄所得空心微珠粒径分布在500 nm至5μm之间,主要表现为非晶组织。经1100℃加热4 h后空心微珠非晶组织消失,M型Sr0.5Ba0.5Fe12O19相出现,微珠表面由纳米片晶和六角晶型组成;经热处理后空心微珠复介电常数明显降低,而复数磁导率基本不变。吸波测试表明:热处理后尽管形成了锶钡铁氧体,但其吸波性能却大幅下降,这主要是由热处理后复介电常数下降导致介电损耗降低引起的,而非晶组织却表现出具有一定的吸波性能,这值得进一步研究。Using Fe（NO3）3＋ Ba（NO3）2＋ Sr（NO3）3＋ CO（NH2）2as the reaction system,micro-nano hollow ceramic microshperes was prepared successfully by low-temperature self-reactive quenching method combined with heat treatment. The morphology,phase composition,electromagnetic parameters of samples,the formation mechanism and electromegnetic properties were characterized by SEM,XRD and VNA. The results show that hollow microspheres before heat treatment is composed of amorphous,and the particle size ranges in 500 nm to 5 μm. After 1100 ℃ heat treatment 4 h,the amorphous disappears,M-type Sr0. 5Ba0. 5Fe12O19 exists,and the surface was transformed for nano-lamella and hexagonal crystal.After heat treatment,the complex dielectric constant of hollow microshperes reduced obviously,while the complex permeability was decreased slightly. Absorption test shows that after heat treatment,although strontium-barium ferrite appeared,absorption properties was decreased significantly. This is mainly due to the complex permeability decreased and dielectric loss weakened,while amorphous with a certain absorption properties,is worthy of further study.

关 键 词：自反应淬熄法 锶钡铁氧体 空心微珠 吸波性能 

分 类 号：TB333[一般工业技术—材料科学与工程]