摘要
针对现有磁性金属吸收剂耐腐蚀性能不足,以不锈FeCr合金为吸收剂,三元乙丙橡胶(EPDM)为基体制备了不同吸收剂体积含量的吸波材料,采用HP8722ET矢量网络分析仪对其电磁与吸波性能进行了研究。结果表明:在2～18GHz范围内,随着频率的增加,磁性不锈FeCr合金/EPDM吸波材料的介电常数实部(ε′)基本保持不变;介电常数虚部(ε″)不断增加;而磁导率的实部(μ′)和虚部(μ″)不断减小。随着FeCr合金吸收剂体积含量的增加,ε′,ε″和μ″不断增大;而μ′在低频随着体积含量的增加而增加,在高频却相反;3mm厚吸波材料最小反射率先减小后变大,吸收峰由高频向低频移动,半高宽逐渐变窄。FeCr合金体积含量为20%时,在频率为10.3GHz时最小反射率为-16.8dB,反射率小于-8dB的带宽达5.8GHz(7.2～13GHz);体积含量为30%时,在频率为6.2GHz时最小反射率达-23.1dB,反射率小于-8dB的带宽为4.9GHz(4.1～9GHz),在X和C波段具有较好吸波性能,有一定的应用前景。
In view of the poor corrosion resistance of the existing magnetic metal absorbents,microwave absorbing materials were prepared by using ethylene-propylene-diene monomer（EPDM）rubber as matrix and different volume contents of stainless FeCr alloy as absorbents.The electromagnetic and microwave absorbing properties of the samples were examined by using a HP8722ET network analyzer.The results indicate that the real part of permittivity（ε＇）of magnetic stainless FeCr alloy /EPDM absorbing materials changes slightly with increasing frequency in 2~18GHz.The imaginary part of permittivity（ε″）increases,and the complex permeability（μ＇ and μ＇＇）decrease;With increasing FeCr alloy volume fraction,ε＇,ε″ and μ＇ increase,however μ＇ increases in the low frequency and decreases in the high frequency.The minimum reflectivity of 3mm thick absorbing material firstly decreases,then increases.The absorption peak moves from high frequency to low frequency,and the full width at half maximum（FWHM）becomes narrow.The 3mm thick absorbing material with 20vol% FeCr alloy,has the minimum reflectivity of-16.8dB at 10.3GHz,the reflectivity exceeds-8dB in the range of 7.2~13GHz;when the volume content reaches 30%,the minimum reflectivity is-23.1dB at 6.2GHz,the reflectivity exceeds-8dB in the range of 4.1~9GHz.The FeCr alloy/EPDM microwave absorbing materials possess good microwave absorbing properties in the X-and C-band,and has potential applications.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2010年第3期395-398,共4页
Journal of Materials Science and Engineering
关键词
不锈FeCr合金
吸波材料
电磁参数
吸波性能
反射率
stainless FeCr alloy
microwave absorbing materials
electromagnetic parameters
microwave absorbing property
reflectivity
