铁尾矿—钢渣基复合吸波材料的制备与性能研究

针对目前水泥基吸波材料带宽窄、吸收率低、而且制备成本高的问题,选用铁尾矿与钢渣固废资源为胶 凝填充材料,利用钢纤维作为吸波剂制得电磁波吸收复合材料。 采用矢量网络分析仪测定复合材料在 0. 1 ~ 5 GHz 范 围内的相对复介电常数与复磁导率,计算得到其电磁波损耗系数与反射率,并制备不同厚度样品分析了复合材料的 电磁波吸收机理。 研究表明:铁尾矿与钢渣中的磁性矿物相组分能显著提升材料的电导能力,影响电磁参数,提升介 电损耗与磁损耗能力;增加钢纤维吸波剂的使用量能够降低与之匹配复合材料的最小厚度,当铁尾矿、钢渣掺量分别 为 10%、30%,钢纤维体积比为 0. 5%时,制备出的 15 mm 厚度复合吸波材料最小反射率达到-46. 863 dB,有效带宽占 比 18. 8%。

Study on the Preparation and Properties of Iron Tailings-Steel Slag Based Composite Microwave Absorbing Materials

Aiming at the current problem of narrow absorbing bandwidth,low absorptivity peak,and high preparation cost of microwave absorbing cementitious materials,the microwave absorbing composite materials were prepared,which selected iron tailings and steel slag solid waste resources as cementitious filling materials,and steel fiber was used as microwave absorber. The relative complex permitivity and complex permeability of composites in the frequency of 0. 1~5 GHz were measured by vector network analyzer,and the microwave loss coefficient and reflection loss were calculated. At the same time,the samples of different thickness were prepared to analyze the microwave absorption mechanism of the composite materials. The results showed that the magnetic mineral composition of iron tailings and steel slag could significantly improve the electrical conductivity of the materials,affect the electromagnetic parameters,and improve the capability of dielectric loss and magnetic loss. The usage amount of steel fiber could control the matching thickness of composite materials. When the content of iron tailings and steel slag were 10% and 30%,and the volume fraction of steel fiber was 0. 5%,the minimum reflection loss of the prepared 15 mm thickness microwave absorbing composites reached-46. 863 d B,and the effective absorbing bandwidth accounted for 18. 8%.