欢迎登录材料期刊网

材料期刊网

高级检索

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2~18GHz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.

参考文献

[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.Nanocrystalline 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.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%