摘要
以天然磁铁矿粉为低成本吸收剂制备了水泥基吸波材料,采用矩形波导法测试了不同磁铁矿掺量试样的复介电常数与复磁导率,并基于传输线与阻抗理论计算了试样的反射率.结果表明,掺天然磁铁矿水泥复合材料在8．2～12．4 GHz 频率范围内具有较高的电磁参数,表现出明显的电损耗与磁损耗.磁铁矿水泥复合材料存在2．5和8．5mm 两个匹配厚度.随磁铁矿掺量的增加,吸收峰向低频方向移动.当试样厚度为2．5mm时,磁铁矿掺量15％时,复合材料吸波性能最好,吸收峰值达到－14.8dB,反射率低于－10dB的频带达到2.1GHz,而试样厚度为8．5mm时吸收峰值较低,但是吸收频带较窄.
The cement-based composites were fabricated using natural magnetite as low-cost absorbers.The complex permittivity and complex permeability of samples with different amount of natural magnetite powders were tested by the method of rectangular waveguide in the frequency of 8.2-12.4 GHz,and the reflection loss of samples were calculated based on the transmission line and impedance theory.The results show that the electro-magnetic parameters of magnetite/cement composites are much higher than that of non-additive d cement.Mag-netite/cement composites have two impedance thicknesses,2.5 and 8.5 mm.The absorbing peak is moved to a lower frequency with increasing magnetite content.When the sample thickness is 2.5 mm,the sample consist of 15% magnetite show best absorbing performance;The bandwidth of reflection loss less than -10 dB is en-larged to 2.1 GHz with a peak value of -14.8 dB.However,when the sample thickness is 8.5 mm,the absorb-ing bandwidth is narrow.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2015年第2期2019-2022,2027,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51308062)
中国博士后科学基金资助项目(2013M540726)
中央高校基本科研业务资金资助项目(2014G1311084)
关键词
天然磁铁矿
水泥基复合材料
吸波
natural magnetite
cement-based composites
electromagnetic wave absorbing
