关键词: 纳米Mn-Zn铁氧体;双层水泥基吸波材料;磁流体;反射率

Abstract: Nano Mn-Zn ferrite magnetic fluid was prepared by chemical coprecipitation method,and then was added to the cement paste to prepare the wave absorbing layer with a certain proportion.Double layer cement-based wave absorbing materials were prepared by using expanded perlite as a matching layer,and the effects of the content of nano Mn-Zn ferrite on absorbing properties of the cement-based wave absorbing materials were investigated.The results show that the reflectivity of nano Mn-Zn ferrite wave absorbing mortar is less than -10 dB in the range of 8-18 GHz,and the minimum reflectivity is -15.1 dB at 18 GHz,when the thickness is(20+10)mm and content is 7%.

Key words: nano Mn-Zn ferrite;double layer cement-based wave absorbing material;magnetic fluid;reflectivity