电磁改性谐振水泥基复合材料的吸波性能研究

Research on absorbing properties of electromagnetic modified resonance-cement-based composite

利用涂挂法,分别在粉煤灰漂珠和闭孔珍珠岩表面涂挂石墨和铁氧体,通过扫描电镜对比改性前后漂珠和珍珠岩表面的微观变化。研究表明石墨和铁氧体在连续釉化面与特殊蜂窝结构的相间的珍珠岩颗粒表面分布均匀,形成了谐振腔吸波体。改性漂珠和珍珠岩分别与水泥基材料复合,形成吸波水泥基复合材料。采用RCS法测量各复合水泥基材料对S～C波段和X～Ku波段的电磁波反射率,研究复合水泥基材料的吸波效能。研究表明与涂挂法改性漂珠相比,涂挂法改性闭孔珍珠岩能有效提高水泥基材料的吸波效能,拓宽了-10dB带宽,具有进一步实际应用研究的意义。

Fly ash floating beads and closed cell perlite were coated by graphite and ferrite respectively, and then it was compared of the microscopic changes of the surface of fly ash floating beads and closed cell before and after modification by SEM. Results show that graphite and ferrite, respectively, distributed uniformly on closed cell perlite surface, in which continuous glaze surface and special honeycomb structures distribute alternately and formed the good performance resonant absorber. Modified ash floating beads and closed cell perlite mixed with cement-based materials to form cement-based absorbing composites, and then it was measured that radar reflectivity of the cement-based absorbing composites in S-C and X-Ku by using RCS to study the absorbing per- formance. The results show that compared with the modified fly ash floating beads by coating, the modified closed cell perlite by coating was more effective to improve the absorbing properties of the cement-based composites, and broadened --10dB bandwidth. It is significance to further the practical application of the cementbased composites.