全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

二氧化硅/片状金属磁粉壳核粒子制备及电磁特性

, PP. 18-22

Keywords: 金属磁性微粉,SiO2,表面改性,介电常数,吸波性能

Full-Text   Cite this paper   Add to My Lib

Abstract:

以正硅酸乙酯为前驱体,采用溶胶-凝胶工艺对厚度1μm、直径5μm左右的片状金属磁性微粉进行表面改性,获得SiO2/金属壳-核结构复合粒子。用SEM、TEM、RA-IR等方法对磁粉表面SiO2纳米粒子膜的形貌、结构进行表征,并对改性前后磁粉/石蜡复合材料的复磁导率和复介电常数等微波电磁参数进行测试。结果表明:SiO2纳米粒子吸附在磁粉表面,形成高电阻率的包覆膜;将该微粉按质量比(5∶1)与石蜡复合,在2~18GHz频率范围内测量介电常数,与未改性样品比较,其介电常数实部平均下降约20,虚部平均下降约7,而对应的复磁导率变化较小。用金属磁粉制备1mm厚的吸波涂层,涂层在8dB的吸收带宽由改性前的3.2GHz(7.0~10.2GHz)增加到改性后的7GHz(7.6~14.6GHz),改善了吸收剂的吸波性能。

References

[1]  毛卫民, 方 鲲, 吴其晔, 等. 导电聚苯胺/羰基铁粉复合吸波材料 [J]. 复合材料学报, 2005, 22(1): 11 -14. Mao Weimin, Fang Kun, Wu Qiye, et al. Conductive polyaniline/iron carbonyl powder composite material for wave absorbing [J]. Acta Materiae Compositae Sinica, 2005, 22(1): 11 -14.
[2]  赵乃勤, 曹 婷, 师春生, 等. 碳纤维(碳毡)/树脂复合吸波材料的研究 [J]. 复合材料学报, 2003, 20(5): 63 -67. Zhao Naiqin, Cao Ting, Shi Chunsheng, et al. Microwave absorbing properties of carbon fiber (carbon fiber felt)/epoxy composites [J]. Acta Materiae Compositae Sinica, 2003, 20(5): 63 -67.
[3]  周佩珩, 邓龙江, 翁小龙. 磁性纳米晶颗粒电磁特性研究进展 [J]. 隐身技术, 2005(4): 28 -33. Zhou Peiheng, Deng Longjiang, Weng Xiaolong. Status and advance in the research on electromagnetic properties of magnetic nanocrystalline [J]. Stealth Technology, 2005(4): 28 -33.
[4]  Zhou Peiheng, Deng Longjiang, Xie Jianliang, et al. Nano-crystalline structure and particle size effect on microwave permeability of FeNi powders prepared by mechanical alloying [J]. Magnetism and Magnetic Materials, 2005, 292: 325 -331.
[5]  杨志民, 毛昌辉, 杨 剑, 等. 低频(3GHz)微波吸收材料电磁参数匹配特性的研究 [J]. 稀有金属, 2004, 28(6): 1006 -1009. Yang Zhimin, Mao Changhui, Yang Jian, et al. Matching characteristic of electro-magnetic parameters of microwave absorbing materials for low frequency (3GHz) [J]. Chinese Journal of Rare Metals, 2004, 28(6): 1006 -1009.
[6]  Vishwas V Hardikar, Egon Matijevic. Coating of nanosize silver particles with silica [J]. Colloid Interface Sci, 2002, 221(1): 133 -136.
[7]  Ung T, Liz Marzan L M, Mulvaney P. Optical properties of thin films of Au/SiO2 particles [J]. Phys Chem B, 2001, 105(17): 3441 -3452.
[8]  赵 丽, 余家国, 程 蓓, 等. 单分散二氧化硅球形颗粒的制备与形成机理 [J]. 化学学报, 2003, 61(4): 562 -566. Zhao Li, Yu Jiaguo, Cheng Bei, et al. Preparation and formation mechanisms of monodispersed silicon dioxide spherical particles [J]. Acta Chimica Sinica, 2003, 61(4): 562 -566.
[9]  Wu L Z, Ding J, Jiang H B, et al. Particle size influence to the microwave properties of iron based magnetic particulate composites [J]. Magnetism and Magnetic Materials, 2005, 285(1/2): 233 -239.
[10]  高正娟, 曹茂盛, 朱 静. 复合吸波材料等效电磁参数计算的研究进展 [J]. 宇航材料工艺, 2004(4): 12 -15. Gao Zhengjuan, Cao Maosheng, Zhu Jing. Development in study of effective electromagnetic parameters of absorbing composite [J]. Aerospace Materials & Technology, 2004(4): 12 -15.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133