基于自反应喷射成形技术制备Mn-Zn铁氧体片状吸波剂
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摘要
以Fe+MnO_2+Fe_2O_3+ZnO为反应体系,采用自反应喷射成形技术成功制备了Mn-Zn铁氧体片状吸波剂。计算了反应体系的焓值和体系的绝热燃烧温度Tad,研究分析了片状锰锌铁氧体的形成机制。采用SEM和XRD分析了吸波剂的形貌和成分。结果表明,体系Tad为2 055K,满足自蔓延反应的条件,且大于反应产物熔点,保证了反应产物以熔滴形式撞击基板实现扁平化。制备的吸波剂大部分颗粒呈片状,长约150μm,厚约20μm,由Mn0.5Zn0.5Fe2O4相和少量Fe2O3相组成。利用网络矢量分析仪测定其在0.5~18GHz频段内的电磁参数,吸波剂在16GHz附近存在一个吸收峰,峰值最高达-14dB,低于-10dB的频率带宽达5GHz,吸波性能较好,具有一定应用价值。
Fe,MnO2,Fe2O3 and ZnO as the reaction system,Mn-Zn ferrite flake absorber was prepared successfully by self-reactive spray forming technology.Enthalpy(H)and adiabatic temperature(Tad)of system are calculated to analyses the formation mechanism.SEM and XRD were used to characterize the pattern and phase of sample.According to the excess,Tadis 2 055 K,self-propagation reactive can be ignited and products can be melted,the product molten drops impacted onto cupreous plate to achieve flattening.The results showed that most of absorber were flake with diameters of 150μm long and 20μm thick,constituted by Mn0.5Zn0.5Fe2O4 phase and few Fe2O3 phase with spinel crystal structure.Absorption test showed that absorber had one absorbent peak,the maximum value of microwave reflection loss was-14 dB and the frequency range was 5GHz where the microwave absorption values are less than-10 dB.The results showed the Mn-Zn ferrite flake absorber provided with preferable property,is worthy of further study.
Fe,MnO2,Fe2O3 and ZnO as the reaction system,Mn-Zn ferrite flake absorber was prepared successfully by self-reactive spray forming technology.Enthalpy(H)and adiabatic temperature(Tad)of system are calculated to analyses the formation mechanism.SEM and XRD were used to characterize the pattern and phase of sample.According to the excess,Tadis 2 055 K,self-propagation reactive can be ignited and products can be melted,the product molten drops impacted onto cupreous plate to achieve flattening.The results showed that most of absorber were flake with diameters of 150μm long and 20μm thick,constituted by Mn0.5Zn0.5Fe2O4 phase and few Fe2O3 phase with spinel crystal structure.Absorption test showed that absorber had one absorbent peak,the maximum value of microwave reflection loss was-14 dB and the frequency range was 5GHz where the microwave absorption values are less than-10 dB.The results showed the Mn-Zn ferrite flake absorber provided with preferable property,is worthy of further study.
引文
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[16]Liu Jing,Gong Yuanxun,Kuang Qin,et al.Microwave absorption properties of ZnO nanostructures with special morphologies[J].Journal of Xiamen University(Natural Science),2009,48(6):848-853.刘晶,宫元勋,匡勤,等.特殊形貌纳米氧化锌的吸波性能研究[J].厦门大学学报(自然科学版),2009,48(6):848-853.
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[3]Zhang D Y,Zhang W Q,Cai J,Fabrication and electromagnetic properties of flake ferrite particles based on diatomite[J].Journal of Magnetism and Magnetic Materials,2011,(323):2305-2309.
[4]Cui Yinfang,Wang Xin,Jiang Yanfei,et al.Study on sintering process of Mn-Zn ferrite nanopowders and its sintered properties[J].J Synth Cryst,2006,35(4):790-794.崔银芳,王新,姜延飞,等.锰锌铁氧体纳米粉体的烧结过程及其性能测试分析[J].人工晶体学报,2006,35(4):790-794.
[5]Hu Feng,Liu Xiansong,Zhu Deru,et al.Effects of Nb2O5addition on the magnetic properties of Mn-Zn ferrite materials with high initial permeability and low specific loss factor[J].Journal of Functional Materials,2011,42(9):1577-1579.胡锋,刘先松,朱德如,等.掺杂对高磁导率低损耗锰锌铁氧体材料磁性能的影响[J].功能材料,2011,42(9):1577-1579.
[6]Sun Shiyun,Fang Yulong,Fang Yikun,et al.Soft magnetic Mn-Zn ferrite nanoparticles prepared by sol-gel autocombustion[J].J Magn Mater Dev,2004,35(4):21-26.孙式运,方玉龙,方以坤,等.溶胶-凝胶柠檬酸盐自蔓延燃烧法制备的纳米级Mn-Zn软磁铁氧体磁粉[J].磁性材料及器件,2004,35(4):21-26.
[7]Luo Guangshen,Jiang Guiwen,Li Jiande,et al.Effect of heat treatment on structure and magnetic properties of Mn-Zn ferrite[J].Journal of Nanchang University(Natural Science),2010,32(1):79-81.罗广圣,姜贵文,李建德,等.热处理对Mn-Zn铁氧体的结构和磁性能的影响[J].南昌大学学报(工科版),2010,32(1):79-81.
[8]Lavernia E J,Grantn J.Spray deposition of materials:a review[J].Materials Science and Engineering,1988,98:381-388.
[9]Chen Wei,Wang Ziying.The prospect of self propagating reaction hot pressing technology development trend[J].Mech Eng,2005,(3):14-16.陈威,王自营.自蔓延反应热压技术发展趋势展望[J].机械工程师,2005,(3):14-16.
[10]Cai Xudong.Study on the controllable preparation and microwave electromagnetism property of hollow multiphase ceramic micro-spheres[D].Shi Jiazhuang:Ordnance Engineering College,2012.蔡旭东.空心陶瓷微珠的可控制备与微波电磁性能研究[D].石家庄:军械工程学院,2012.
[11]Jiang Jiuxing.Combustion synthesis of MnZnFe2O4ferrite powder[D].Harbin:Harbin Institute of Technology,2005.姜久兴.Mn-Zn铁氧体的燃烧合成研究[D].哈尔滨:哈尔滨工业大学,2005.
[12]Xia Degui,Lu Baisong,Wang Hongkui.Soft ferrite Manufacturing principle and technology[M].XI’an:Shan Xi Press,2010:262-269.夏德贵,陆柏松,王洪奎.软磁铁氧体制造原理与技术,第一版[M].西安:陕西出版社,2010:262-269.
[13]Ye Dalun,Hu Jianhua.Practical Handbook of thermodynamic data of inorganic materials[M].Beijing:The Press of Metallurgical Industry,2002.叶大伦,胡建华.实用无机物热力学数据手册,第二版[M].北京:冶金工业出版社,2002.
[14]Merzhanov A G.Solid flames:discoveries,concepts and horizons of cognition[J].Combust Sci and Tech,1994,98:307-336.
[15]Zhao Jiupeng,Li Yao,Hao Xiaodong.Investigation on the mechanism of self-propagating high-temperature synthesis Ni-Zn ferrite[J].J Chin Cream Soc,2002,30(1):9-13.赵九蓬,李垚,赫晓东.自蔓延高温合成Ni-Zn铁氧体反应机制的研究[J].硅酸盐学报,2002,30(1):9-13.
[16]Liu Jing,Gong Yuanxun,Kuang Qin,et al.Microwave absorption properties of ZnO nanostructures with special morphologies[J].Journal of Xiamen University(Natural Science),2009,48(6):848-853.刘晶,宫元勋,匡勤,等.特殊形貌纳米氧化锌的吸波性能研究[J].厦门大学学报(自然科学版),2009,48(6):848-853.