掺铁氧体和石墨水泥基复合材料吸收电磁波性能  

Electromagnetic wave absorption properties of ferrite and graphite cement-based composite materials

作　　者：吕淑珍[1] 陈宁[2] 王海滨[2] 霍冀川[1] 

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010 [2]绵阳师范学院化学与化学工程学院,绵阳621010

出　　处：《复合材料学报》2010年第5期73-78,共6页Acta Materiae Compositae Sinica

基　　金：先进建筑材料四川省重点实验室开放基金资助项目(08zxxk03);四川省教育厅资助科研项目(2006A139);四川省科技厅资助科研项目(2006J13-034)

摘　　要：研究了添加铁氧体和石墨水泥基复合材料(F/G/C)的吸波性能。通过改变铁氧体、石墨的配比,分析了影响该材料电磁吸收效能的主要因素,并探讨了其影响机制。结果表明:石墨添加量20 vol%时材料出现逾渗现象,逾渗区内介电损耗有较大值;0.5～4 GHz范围内影响吸收深度的最主要因素是石墨,影响吸收宽度的最主要因素是铁氧体,最佳水平组合为20 wt%60μm铁氧体、10 wt%250μm铁氧体、30 vol%石墨,吸收深度可达-32 dB且明显优于单组分复合;吸收主要机制是磁损耗,石墨的加入改善了材料空间波阻抗。Electromagnetic wave absorption properties of cement-based composite material doped with ferrite and graphite（F/G/C） were investigated.The analysis focused on the main impacting factors of absorption performance and explored the mechanism of its influence by changing ferrite and graphite ratio.The results show that 20 vol% graphite causes percolation effect and has great loss tangent.The main influence factor of absorbing depth is graphite,while the main factor impacting absorption width is ferrite.20 wt% 60 μm ferrite,10 wt% 250 μm ferrite and 30 vol% graphtite is the best level combination and its reflectivity reached-32 dB,which is obviously better than single form compound.Additionally,graphite doping improved space wave impedance,but the main absorption mechanism is still magnetic loss.

关 键 词：铁氧体 石墨 水泥基 电磁波吸收 阻抗匹配 

分 类 号：TB332[一般工业技术—材料科学与工程] TB34