掺膨胀珍珠岩水泥基复合吸波材料的研究

Research on Cement Based Composite Absorbing Materials with Expanded Perlite

以钢渣复合水泥作为胶凝基体,掺入低介电常数的多孔无机材料改善基体的表面波阻抗和内部电磁波传输通道,制备出新型水泥基复合吸波材料。试验研究了钢渣改性水泥电磁参数及反射率的变化,膨胀珍珠岩掺量变化对水泥基复合材料吸波性能的影响。结果表明:当掺入30%钢渣微粉,膨胀珍珠岩掺量在50%,厚度为20mm时,在4～8GHz频段范围内最小反射率达-26.9dB,小于-10dB的频带宽度达2GHz;在8～18GHz范围内反射率均小于-9dB,最小吸收峰值为-10.4dB,材料呈现出较好的吸波性能。膨胀珍珠岩的掺量存在一个最佳值,理想范围在50%～60%之间。

Based on steel slag cement modifies cement as a gel matrix, adding low dielectric constant of inorganic materials improve the porous substrate surface wave impedance and internal electromagnetic wave transmission channel, a novel cement based composite wave absorption material is prepared. Series of ex- periment on the electromagnetism parameter of steel slag modified cement and reflectivity of cement based composite material is tested. The result shows that the minimum reflectivity of 20 mm sample occurs at filling 50% vol expanded perlite and 30% wt steel slag. The bandwidth of the reflectivity lower than --10 dB reach 2 GHz within 4 to 8 GHz, with the minimum reflectivity of --26.9 dB. In test frequency of 8 to 18 GHz, the reflectivity all below --9 dB and the minimum reflectivity reaches --10.4 dB, which have showed excellent absorbing performance.