掺杂M型钡铁氧体及其复合材料吸波性能的研究

发布时间：2018-04-21 15:18

本文选题：掺杂钡铁氧体 + 碳包覆　；参考：《西南科技大学》2017年硕士论文

【摘要】：本文以制备出“强吸收、低反射、轻质量、宽频带”吸波材料为目的,通过对磁损耗能力较强的M型钡铁氧体进行离子掺杂改性,研究其吸波性能;选取吸波性能优异的掺杂M型钡铁氧体与葡萄糖进行碳化还原包覆,比较包覆前后其吸波性能的变化;选取吸波性能优异的掺杂M型钡铁氧体与具有较好介电损耗的石墨烯进行复合,探究复合材料的吸波性能。主要结论如下:(1)通过溶胶-凝胶自蔓延燃烧方法制得BaMg_xCo_(1-x)TiFe_(10)O_(19)粉末,Mg~(2+)的替换同时改变了M型钡铁氧体的微观结构和磁性能。随着Mg~(2+)含量的逐渐增加,BaMgxCo1-x TiFe10O19的Hc随之变大,而晶粒粒度和Ms与Mg~(2+)的掺杂量成反比。当BaMg_(0.4)Co_(0.6)TiFe_(10)O_(19)样品的厚度为2.0 mm时,展现出了最佳的微波吸收性能,其反射损耗值达到-33.7 dB,且反射损耗值低于-20 dB时的频带宽达5.7 GHz(11.5-17.2 GHz)。此外,在一定范围内,通过调节Mg~(2+)的含量可以控制Ba Mg_xCo_(1-x)TiFe_(10)O_(19)的磁导率,这意味着BaMg_xCo_(1-x)TiFe_(10)O_(19)的能够在一个更大的范围得到应用。(2)将所得的BaMg_(0.2)Co_(0.8)TiFe_(10)O_(19)(BMCTF)铁氧体粉末与葡萄糖进行水热碳化还原包覆,制成具有核壳结构的C@BMCTF。相较于BMCTF,C@BMCTF的Ms值减小,而Hc增大。当C@BMCT样品厚度为1.8 mm时,展现出最佳微波吸收性能,反射损耗值达到-45.2 dB;当C@BMCTF样品厚度为2.0 mm时,其反射损耗值在12.14 GHz-18 GHz频段内均低于-10 dB。(3)采用Hummers法制备了还原氧化石墨烯(r-GO),并进一步制备了r-GO/BaMg_(0.2)Co_(0.8)TiFe_(10)O_(19)复合材料。结果表明,r-GO/BaMg_(0.2)Co_(0.8)TiFe_(10)O_(19)的Ms明显小于Ba Mg0.2Co0.8TiFe10O19的Ms,而复合前后其Hc几乎不变。当r-GO/BaMg_(0.2)Co_(0.8)TiFe_(10)O_(19)的复合比例为1:1时,样品在频率为17.5 GHz处得到的最大反射损耗值可达-48 dB;当r-GO/Ba Mg_(0.2)Co_(0.8)TiFe_(10)O_(19)的复合比例为1:5时,样品的反射损耗值低于-10 dB的频带宽可达4.6 GHz(11.5 GHz-16.1GHz)。
[Abstract]:In order to prepare "strong absorption, low reflection, light mass, wide frequency band" absorbing materials, the microwave absorbing properties of M-type barium ferrite with strong magnetic loss were studied by ion doping. Dopant M-type barium ferrite with excellent absorbing property was selected for carbonization and reduction coating with glucose, and the changes of absorbing property before and after coating were compared. The composite of doped M-type barium ferrite and graphene with good dielectric loss was selected to study the absorbing property of the composite. The main conclusions are as follows: (1) BaMgxCoS _ 1-xTiFeN _ (10) O _ (1) T _ (2) _ 2) prepared by the sol-gel self-propagating combustion method has changed the microstructure and magnetic properties of M-type barium ferrite at the same time. With the increasing of Mg~(2 content, the HC of BaMgxCo1-x TiFe10O19 becomes larger, and the grain size and Ms are inversely proportional to the doping content of Mg~(2. When the thickness of the sample is 2.0 mm, the optimum microwave absorption performance is shown. The reflection loss value is -33.7 dB, and the band width is 5.7 GHz(11.5-17.2 GHz when the reflection loss value is lower than -20 dB. A core-shell structure of Cellular BMCTF was prepared. Compared with BMCTF, the Ms value of BMCTF decreased and HC increased. When the thickness of C@BMCT sample is 1.8 mm, the optimum microwave absorption performance is shown, and the reflection loss reaches -45.2 dB, and when the thickness of C@BMCTF sample is 2.0 mm, The reflectance loss value is lower than -10dB.m3 in the GHz band of 12.14 GHz-18.) the reduced graphene oxide r-GOA was prepared by Hummers method, and the r-GOR / BaMgS 0.2CoS-1 / 0. 8 TiFeS / 10 O / S / 19) composite was further prepared. The results show that the Ms of r / o / Bamg / C\ + 0\ + 0\%\%\\\ {\}\\\ {\}\ {\}\\\ {\}\\\ When the composite ratio of r-go / BaMgO / 0.2C / T _ (0.8TiFeS) is 1:1, the maximum reflectance loss of the sample can reach -48 dB at the frequency of 17.5 GHz, and when the composite ratio of r-GO/Ba Mg-0.2C / Costr _ (0.8) TiFeS-1) is 1:5, the frequency bandwidth of the sample with a reflectance loss value of less than -10 dB can reach 4.6 GHz(11.5 GHz ~ 16.1GHz ~ (-1) GHz.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM277;TB33

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