以硅溶胶为前驱体,快速制备出SiO_2包覆羰基铁吸收剂,研究了SiO_2包覆对其热性能、电磁和吸波性能的影响.热分析结果表明,SiO_2包覆羰基铁的抗氧化性能显著提高.与未包覆羰基铁相比,SiO_2包覆羰基铁的介电常数和磁导率都有所下降.反射率结果表明,包覆后羰基铁在X波段内具有较好的吸波效果,当包覆后羰基铁质量分数为70%、涂层厚度为1.8mm时,涂层在8.2～12.4GHz频率范围内的反射率均小于-10dB.
The surface of carbonyl iron particles is coated by SiO_2,and the effects of SiO_2 coating on the thermal,electromagnetic and microwave absorbing properties of carbonyl iron panicles are investigated.The thermal analysis result shows that the SiO_2 coating can obviously improve the anti-oxidation property of the carbonyl iron particles.Both the complex permittivity and permeability of the carbonyl iron particles decrease after being coated with SiO_2.The microwave absorbing properties of the coatings show that the good microwave absorption ability (blow-10dB) can obtain in the frequency range of 8.2～12.4GHz when the mass content of SiO2 coated carbonyl iron particles is 70% and the coating thickness is 1.8mm.
参考文献
| [1] | 阮颖铮.雷达截面与隐身技术[M].北京:国防工业出版社,1998:269. |
| [2] | Feng Y B;Qiu T;Shen C Y .Absorbing properties and structural design of microwave absorbers based on carbonyl iron and barium ferrite[J].Journal of Magnetism and Magnetic Materials,2007,318:8. |
| [3] | Yu Mingxun;Li Xiangcheng;Gong Rongzhou et al.Magnetic properties of carbonyl iron fibers and their microwave absorbing characterization as the filer in polymer foams[J].Journal of Alloys and Compounds,2008,456:452. |
| [4] | Shen Guozhu;Xu Ming;Xu Zheng .Double-layer microwave absorber based on ferrite and short carbon fiber composites[J].Materials Chemistry and Physics,2007,105:268. |
| [5] | Inyoung Kim;Seok Bae;Jongryoul Kim .Composition effect on high frequency properties of carbonyl-iron composites[J].Materials Letters,2008(17/18):3043-3046. |
| [6] | Morihiko Matsumoto;Yoshimori Miyata .Polymer absorbers containing magnetic particles: Effect of polymer permittivity on wave absorption in the quasi-microwave band[J].Journal of Applied Physics,2002(12):9635-9637. |
| [7] | 刘建华,周新楣,李松梅.羰基铁/导电聚苯胺微管复合材料的电磁性能[J].复合材料学报,2005(03):70-74. |
| [8] | 谢建良,陆传林,邓龙江.二氧化硅/片状金属磁粉壳核粒子制备及电磁特性[J].复合材料学报,2007(02):18-22. |
| [9] | 冯永宝,丘泰,李晓云,沈春英.羰基铁/三元乙丙橡胶复合材料的吸波性能[J].材料科学与工艺,2008(04):589-592. |
| [10] | A. N. Yusoff;M. H. Abdullah;S. H. Ahmad;S. F. Jusoh;A. A. Mansor;S. A. A. Hamid .Electromagnetic and absorption properties of some microwave absorbers[J].Journal of Applied Physics,2002(2):876-882. |
| [11] | 于华,刘子利,张雪凤,陶杰,陈照峰.硅溶胶改性膨润土的研究[J].硅酸盐通报,2005(04):36-39. |
| [12] | 童国秀,王维,官建国,张清杰.SiO2纳米壳的厚度对羰基铁/SiO2核壳复合[J].无机材料学报,2006(06):1461-1466. |
| [13] | 谢建良,梁波浪,邓龙江.二氧化硅包覆片状金属磁性微粉电磁特性分析[J].功能材料,2008(01):41-43,47. |
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