本文選題：摻雜鋇鐵氧體 + 碳包覆　； 參考：《西南科技大學(xué)》2017年碩士論文

【摘要】：本文以制備出“強吸收、低反射、輕質(zhì)量、寬頻帶”吸波材料為目的,通過對磁損耗能力較強的M型鋇鐵氧體進(jìn)行離子摻雜改性,研究其吸波性能;選取吸波性能優(yōu)異的摻雜M型鋇鐵氧體與葡萄糖進(jìn)行碳化還原包覆,比較包覆前后其吸波性能的變化;選取吸波性能優(yōu)異的摻雜M型鋇鐵氧體與具有較好介電損耗的石墨烯進(jìn)行復(fù)合,探究復(fù)合材料的吸波性能。主要結(jié)論如下:(1)通過溶膠-凝膠自蔓延燃燒方法制得BaMg_xCo_(1-x)TiFe_(10)O_(19)粉末,Mg~(2+)的替換同時改變了M型鋇鐵氧體的微觀結(jié)構(gòu)和磁性能。隨著Mg~(2+)含量的逐漸增加,BaMgxCo1-x TiFe10O19的Hc隨之變大,而晶粒粒度和Ms與Mg~(2+)的摻雜量成反比。當(dāng)BaMg_(0.4)Co_(0.6)TiFe_(10)O_(19)樣品的厚度為2.0 mm時,展現(xiàn)出了最佳的微波吸收性能,其反射損耗值達(dá)到-33.7 dB,且反射損耗值低于-20 dB時的頻帶寬達(dá)5.7 GHz(11.5-17.2 GHz)。此外,在一定范圍內(nèi),通過調(diào)節(jié)Mg~(2+)的含量可以控制Ba Mg_xCo_(1-x)TiFe_(10)O_(19)的磁導(dǎo)率,這意味著BaMg_xCo_(1-x)TiFe_(10)O_(19)的能夠在一個更大的范圍得到應(yīng)用。(2)將所得的BaMg_(0.2)Co_(0.8)TiFe_(10)O_(19)(BMCTF)鐵氧體粉末與葡萄糖進(jìn)行水熱碳化還原包覆,制成具有核殼結(jié)構(gòu)的C@BMCTF。相較于BMCTF,C@BMCTF的Ms值減小,而Hc增大。當(dāng)C@BMCT樣品厚度為1.8 mm時,展現(xiàn)出最佳微波吸收性能,反射損耗值達(dá)到-45.2 dB;當(dāng)C@BMCTF樣品厚度為2.0 mm時,其反射損耗值在12.14 GHz-18 GHz頻段內(nèi)均低于-10 dB。(3)采用Hummers法制備了還原氧化石墨烯(r-GO),并進(jìn)一步制備了r-GO/BaMg_(0.2)Co_(0.8)TiFe_(10)O_(19)復(fù)合材料。結(jié)果表明,r-GO/BaMg_(0.2)Co_(0.8)TiFe_(10)O_(19)的Ms明顯小于Ba Mg0.2Co0.8TiFe10O19的Ms,而復(fù)合前后其Hc幾乎不變。當(dāng)r-GO/BaMg_(0.2)Co_(0.8)TiFe_(10)O_(19)的復(fù)合比例為1:1時,樣品在頻率為17.5 GHz處得到的最大反射損耗值可達(dá)-48 dB;當(dāng)r-GO/Ba Mg_(0.2)Co_(0.8)TiFe_(10)O_(19)的復(fù)合比例為1:5時,樣品的反射損耗值低于-10 dB的頻帶寬可達(dá)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.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM277;TB33

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 趙靜;林藝;徐榮臻;劉崇波;況緣英;楊穎;;手性吸波材料研究進(jìn)展[J];功能材料;2013年S1期

2 王磊;朱保華;;磁性吸波材料的研究進(jìn)展及展望[J];電工材料;2011年02期

3 代波;邵曉萍;馬擁軍;裴重華;;新型碳材料——石墨烯的研究進(jìn)展[J];材料導(dǎo)報;2010年03期

4 邱琴;張晏清;張雄;;電磁吸波材料研究進(jìn)展[J];電子元件與材料;2009年08期

5 范U，

本文編號：1782982