热解温度对多晶铁纤维的静磁和微波电磁性能的影响  

INFLUENCES OF PYROLYSIS TEMPERATURE ON STATIC MAGNETIC AND MICROWAVE ELECTROMAGNETIC PROPERTIES OF POLYCRYSTALLINE IRON FIBERS

作　　者：童国秀[1] 官建国[1] 樊希安[1] 王维[1] 李维[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《金属学报》2008年第7期867-870,共4页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划项目2006AA03A209;教育部新世纪优秀人才支持计划项目NCET-05-0660;霍英东青年教师基金项目101049资助~~

摘　　要：在气流的诱导作用下,仅通过控制五羰基铁的热解温度,可获得不同晶粒尺寸及化学组成的多晶铁纤维.研究了热解温度对多晶铁纤维的静磁和微波电磁性能的影响规律.结果表明,由于多晶铁纤维的结构和组成随热解温度里规律性变化,导致多晶铁纤维的静磁和微波电磁性能对热解温度有强烈的依赖性.500℃获得的多晶铁纤维晶粒尺寸为21.6 nm,碳含量为8.26%,此时软磁性能最差,复介电常数和复磁导率最低;而在700℃获得的多晶铁纤维的晶粒尺寸为61.1 nm,碳含量为3.88%,此时具有最佳的软磁性能和最高的介电损耗及磁损耗.这表明通过调节热解温度控制产物的结构和组成,可以获得微波电磁性能优良的多晶铁纤维.Using the high pure argon gas as carrier gas, the polycrystalline iron fibers with tunable morphology, different grain sizes and compositions were prepared just by controlling pyrolysis temperature of Fe（CO）5. The effects of pyrolysis temperature on the static magnetic properties and microwave electromagnetic properties were studied. The results show that the static magnetic properties and microwave electromagnetic properties of polycrystalline iron fibers are strongly dependent on the pyrolysis temperature owing to regular changes of the grain size and composition of polycrystalline iron fibers with pyrolysis temperature. The polycrystalline iron fiber prepared at 500℃ has 21.6 nm grain size and 8.26%C content, and its soft magnetic properties are the worst, permittivity loss and permeability are the lowest, however, the polycrystalline iron fiber prepared at 700℃ has 61.1 nm grain size and 3.88℃ content, and its soft magnetic properties are the best, permittivity loss and permeability loss are the biggest.

关 键 词：多晶铁纤维 热解温度 静磁性能 微波电磁特性 

分 类 号：O641[理学—物理化学] TB383[理学—化学]