Study on Absorption Properties of Cement-Based Composite Materials by Doping Mn-Zn Ferrite

Mn-Zn ferrite was made from ferric oxide,zinc oxide and manganese carbonate by grinding and burning.Then cement-based composite absorption materials was prepared with Mn-Zn ferrite and portland cement.The effect of ferrite absorber content,cementitious materials and surface shape of specimen on absorption properties of cement-based composite were studied.The experiment data indicate that stability of ferrite in cement is good,effects of its content and surface shape of cement-based composite on absorption properties are more remarkable.The reflectivity of cement-based composite with 35%(by mass) ferrite is less than-6 dB,reflectivity of specimen with coarse surface is less than-7 dB in 8～12.5 GHz frequency range,and the least reflectivity is -10.5 dB.