低熔点玻璃粉包覆FeSiAl合金的结构和电磁性能
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摘要
将低熔点玻璃粉D250绝缘包覆剂与扁平化的FeSiAl合金粉末机械混合,进行热处理使D250熔融流动而包覆在片状FeSiAl粉末表面。借助XRD,SEM,XRF和EDS等手段研究了包覆后粉末的物相组成、表面形貌和元素组成;用矢量网络分析仪测试了材料在1～18 GHz频率范围内的电磁参数和反射损耗。结果表明,熔融包覆后的粉末形成均匀致密的包覆层,其复介电常数的实部降低到8左右。热处理温度为700℃时材料的最大反射损耗降至-40.10dB,有效频宽达到3.76 GHz。
FeSiAl alloy flakes were coated with glass powder D250 of low melting point via a twostep process, i.e. FeSiAl alloy flakes and glass powders D250 were firstly blended by ball milling to prepare D250 powders covered FeSiAl alloy flakes and then which was heat treated at proper elevated temperature. The phase composition, surface topography and composition of the coated flakes were characterized by using XRD, SEM, XRF and EDS. The electromagnetic parameter and reflection loss were also assessed in the frequency range of 1～18 GHz by using vector network analyzer. The results show that a dense coating formed on the flakes with uniform appearance, which present a lower real part of their complex permittivity of about 8. The glass D250 coated FeSiAl alloy flakes with optimal performance could be acquired when the heat treatment process was conducted at 700℃, namely the maximum reflection loss depresses to-40.10 dB, and the effective bandwidth reaches to 3.76 GHz, respectively.
FeSiAl alloy flakes were coated with glass powder D250 of low melting point via a twostep process, i.e. FeSiAl alloy flakes and glass powders D250 were firstly blended by ball milling to prepare D250 powders covered FeSiAl alloy flakes and then which was heat treated at proper elevated temperature. The phase composition, surface topography and composition of the coated flakes were characterized by using XRD, SEM, XRF and EDS. The electromagnetic parameter and reflection loss were also assessed in the frequency range of 1～18 GHz by using vector network analyzer. The results show that a dense coating formed on the flakes with uniform appearance, which present a lower real part of their complex permittivity of about 8. The glass D250 coated FeSiAl alloy flakes with optimal performance could be acquired when the heat treatment process was conducted at 700℃, namely the maximum reflection loss depresses to-40.10 dB, and the effective bandwidth reaches to 3.76 GHz, respectively.
引文
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[2]Feng Y,Tang C,Qiu T.Effect of ball milling and moderate surface oxidization on the microwave absorption properties of FeSiAl composites[J].Materials Science and Engineering:B,2013,178(16):1005
[3]Liu C,Cai J,Duan Y,et al.Aligning flaky FeSiAl particles with a two-dimensional rotating magnetic field to improve microwave-absorbing and shielding properties of composites[J].Journal of Magnetism and Magnetic Materials,2018,458:116
[4]Zhou T D,Liang D F,Deng L J,et al.Electron Structure and Microwave Absorbing Ability of Flaky FeSiAl Powders[J].Journal of Materials Science and Technology,2011,27(2):170
[5]Wang L,Quan Q,Zhang L,et al.Microwave absorption of NdFe magnetic powders tuned with impedance matching[J].Journal of Magnetism and Magnetic Materials,2017,449:385
[6]Zhou L,Huang J,Wang X,et al.Mechanical,dielectric and microwave absorption properties of FeSiAl/Al2O3composites fabricated by hot-pressed sintering[J].Journal of Alloys and Compounds,2017,774:813
[7]Xie D Z,Lin K H,Lin S T.Effects of processed parameters on the magnetic performance of a powder magnetic core[J].Journal of Magnetism&Magnetic Materials,2014,353(3):34
[8]Li Z,Xu B C,Wang J J,et al.Progress of microwave absorbing composite materials[J].Journal of Functional Materials,2016,47(s1):49(李泽,许宝才,王建江等.吸波材料复合化的研究进展[J].功能材料,2016,47(s1):49)
[9]Zhang Y,Zhou T.Structure and electromagnetic properties of FeSiAl particles coated by MgO[J].Journal of Magnetism&Magnetic Materials,2017,426:680
[10]Xue Z,Liu T,Liang D F,et al.NiZn-ferrite-coated FeSiAl alloy composite and its microwave electromagnetic properties[J],Journal of Magnetic Materials and Devices,2012,43(3):40(薛志,刘涛,梁迪飞等.NiZn铁氧体包覆FeSiAl合金复合材料及其微波电磁性能[J].磁性材料及器件,2012,43(3):40)
[11]Feng G,Pengfei Li,Qun W.Effects of annealing temperature on microstructure and electromagnetic characteristics of FeSiAl alloy[J].Electronic Components&Materials,2009,28(5):11
[12]Cao Q,Gong R Z,Feng Z K,et al.Microwave absorption property of Fe-Si-Al magnetic alloy powders[J].The Chinese Journal of Nonferrous Metals,2006,16(3):524(曹琦,龚荣洲,冯则坤等.Fe-Si-Al系合金粉微波吸收特性[J].中国有色金属学报,2006,16(3):524)
[13]Deng L W,Feng Z K,Jiang J J,et al.Microwave absorbing capability of Fe85Si1Al6Cr8nanocrystalline flakes[J].Acta Metallurgica Sinica,2006,42(3):321(邓联文,冯则坤,江建军等.纳米晶Fe85Si1Al6Cr8扁平状颗粒材料微波吸收特性[J].金属学报,2006,42(3):321)
[14]Zhang N.Study on the electromagnetic properties and mechanism of FeSiAl alloy micropowder composites[D].Cheng Du:School of Electronic Science and Engineering,2018(张楠.FeSiAl系合金微粉复合材料电磁性能机理研究[D].成都:电子科技大学,2018)
[15]Cai X,Jiang X,Xie W,et al.Effect of particle size on the preparation and microwave absorption properties of FeSiAl magnetically soft alloy hollow microspheres[J].Defence Technology,2018,14(5):477