杨木纤维/镍铁氧体复合中空微管的制备及吸波性能
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摘要
采用化学离析法制备杨木纤维,高温烧结形成杨木纤维碳材;Sol-gel法制备杨木纤维/镍铁氧体复合中空微管和镍铁氧体纳米粉料。利用XRD,SEM和矢量网络分析仪对3种样品的结构、形貌和吸波性能进行表征。结果表明:复合微管长度约为100μm,直径约为5μm,包覆的镍铁氧体层厚度约为1.5μm;复合微管的吸波性能远高于纳米粉料和杨木纤维碳材料,其在(2～18)GHz内的最大反射损耗达-30.4 dB(10.6 GHz),反射损失低于-10 dB的频率为(5.8～13.6)GHz。与已有研究结果比较,复合微管材料具有较低的质量分数和更宽的吸波频带。
The poplar fibers/NiFe_2O_4 composite microtubules and NiFe_2O_4 nanoparticles were prepared by a Sol?gel method. Poplar fibers were prepared by a chemical method of segregation and then the fiber?carbons were formed by high temperature sintering.The prepared materials were characterized by scanning electron microscopy(SEM),X?ray diffraction(XRD),and a vector network analyzer(VNA). The results show that the composite microtubules maintain a hollow structure of poplar fibers. The length of the composite microtubules is about 100 microns,5 microns in diameter and the thickness of the coated nickel ferrite is about 1.5 microns. The microwave absorption properties of the poplar fibers/NiFe_2O_4 composite microtubules are better than those of the NiFe_2O_4 nanoparticles and the poplar fiber composite microtubules is-30.4 dB(10.6 GHz),the frequency range is from 5.8 GHz to 13.6 GHz for the reflectance loss less than-10 dB. Compared with the existing results,the composite microtubules have lower mass fraction and wider absorbing band.
The poplar fibers/NiFe_2O_4 composite microtubules and NiFe_2O_4 nanoparticles were prepared by a Sol?gel method. Poplar fibers were prepared by a chemical method of segregation and then the fiber?carbons were formed by high temperature sintering.The prepared materials were characterized by scanning electron microscopy(SEM),X?ray diffraction(XRD),and a vector network analyzer(VNA). The results show that the composite microtubules maintain a hollow structure of poplar fibers. The length of the composite microtubules is about 100 microns,5 microns in diameter and the thickness of the coated nickel ferrite is about 1.5 microns. The microwave absorption properties of the poplar fibers/NiFe_2O_4 composite microtubules are better than those of the NiFe_2O_4 nanoparticles and the poplar fiber composite microtubules is-30.4 dB(10.6 GHz),the frequency range is from 5.8 GHz to 13.6 GHz for the reflectance loss less than-10 dB. Compared with the existing results,the composite microtubules have lower mass fraction and wider absorbing band.
引文
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[5]HOU C L,LI T H,ZHAO T K,et al. Microwave absorption and?mechanical properties of La(NO3)3?doped multi?walled carbon nanotube/polyvinyl chloride composites[J]. Materials Letters,2012,67(1):84-87.
[6]SAINI P,CHOUDHARY V,SINGH B P,et al. Enhanced mi?crowave absorption behavior of polyaniline?CNT/polystyrene blend in 12.4?18.0 GHz range[J]. Synthetic Metals,2011,161(15/16):1522-1526.
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[9]ZHANG Jun,XIAO Peng,ZHOU Wei,et al. Preparation and microwave absorbing properties of carbon fibers/epoxy compos?ites with grid structure[J]. Journal of Materials Science:Mate?rials in Electronics,2015,26(2):651-658.
[10]HUANG Xiaogu,CHEN Yunyun,YU Jianghua,et al. Fabrica?tion and electromagnetic loss properties of Fe3O4nanofibers[J]. Journal of Materials Science:Materials in Electronics,2015,26(6):3474-3478.
[11]TONG Guoxiu,HUA Qiao,WU Wenhua,et al. Effect of liquid?solid ratio on the morphology,structure,conductivity,and electromagnetic characteristics of iron particles[J]. Science China Technological Sciences,2011,54(2):484-489.
[12]TONG Shiyuan,WU Jennming,TUNG Meanjue,et al. Effect of Ni concentration on electromagnetic wave absorption of(Ni,Mn,Zn)Fe2O4/resin particulate composites[J]. Journal of Alloys&Compounds,2012,525:143-148.
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