CAJ | 학술논문

本文研究了玻璃包覆非晶微丝FeCoMnSiB在微波频段的电磁特性.用X射线衍射技术分析了退火前微丝和不同温度退火后微丝的组织结构.分析结果表明,铁基微丝在退火前的组织是由纳米晶和非晶混合组成的,经过465～550℃等温退火1h后,微丝内部组织和电磁特性都发生了改变.把退火前和经过不同温度退火处理过的微丝按一定配比分别散乱混合在石蜡基体里制成同轴样品,采用矢量网络分析仪测试微丝在2 GHz到18 GHz频段的复介电常数和复磁导率,同时模拟计算不同厚度单层吸波涂层的反射吸收率.由退火前微丝填充组成的涂层中,最小反射率可达-30 dB;当微丝经过490℃等温退火后,不同厚度涂层的反射率曲线出现了不止一个吸收峰,而且有的曲线上的吸收峰同时都小于-10 dB,吸波的频率范围变宽.结果表明,玻璃包覆铁基微丝可作为电磁损耗材料,具有良好的微波吸收特性.
본문연구료파리포복비정미사FeCoMnSiB재미파빈단적전자특성.용X사선연사기술분석료퇴화전미사화불동온도퇴화후미사적조직결구.분석결과표명,철기미사재퇴화전적조직시유납미정화비정혼합조성적,경과465～550℃등온퇴화1h후,미사내부조직화전자특성도발생료개변.파퇴화전화경과불동온도퇴화처리과적미사안일정배비분별산란혼합재석사기체리제성동축양품,채용시량망락분석의측시미사재2 GHz도18 GHz빈단적복개전상수화복자도솔,동시모의계산불동후도단층흡파도층적반사흡수솔.유퇴화전미사전충조성적도층중,최소반사솔가체-30 dB;당미사경과490℃등온퇴화후,불동후도도층적반사솔곡선출현료불지일개흡수봉,이차유적곡선상적흡수봉동시도소우-10 dB,흡파적빈솔범위변관.결과표명,파리포복철기미사가작위전자손모재료,구유량호적미파흡수특성.
The electromagnetic properties of glass-coated amorphous microwires, FeCoMnSiB, were studied in the microwave frequency range. The phase structures of as-prepared and annealing microwires were investigated by X-ray diffraction. The result shows that as-prepared Fe-hased microwires consist of both nanocrystais and amorphous structure. The structure and electromagnetic properties of the microwires were changed after annealing at 465-550℃ during 1 h. Coaxial composite samples were prepared by randomly dispersing short microwires, including as-prepared and being annealed at different temperatures, to paraffin wax. The complex perrnittivity and permeability of composites were investigated by coaxial line method with vector network analyzer in the frequency range of 2-18 GHz. In addition, the reflection absorption of monolayer coating with different thicknesses was calculated. The minimum reflectivity of coating made of as-prepared Fe-based nanocrystals microwires was close to -30 dB. After samples annealed at 490℃, the reflectivity curves of coating with different thicknesses appear more than one absorption peak. And the peak values of curves are all lower than -10 dB. The range of useful frequency is wider than that of the as-prepared microwires. The results show that glass-coated Fe-based microwires are electromagnetic loss materials and exhibit excellent microwave absorption performance.