中文摘要：

采用原位化学沉淀法将Fe3O4与石墨复合,研究了不同复合比例对吸波性能的影响.结果表明：随着Fe3O4负载量的增加,复合材料中Fe3O4的X射线衍射峰增强;Fe3O4主要沉积在石墨表面,随着Fe3O4负载量的增加,对石墨表面的包覆越完整,但也有一些Fe3O4纳米颗粒散落在石墨颗粒之间;复合材料的介电常数随Fe3O4负载量的增大而减小,磁导率变化较小;在Fe3O4与石墨不同质量比复合材料中,质量比为5∶1和4∶1的复合材料表现出较好的吸波效果,在厚度为1.5mm时,质量比为5∶1样品吸收峰值达-31.9dB,大于-10dB的吸收频带宽为5.0GHz.

英文摘要：

The Fe3O4 and graphite composites are prepared by in-situ chemical precipitation. The effect of mass ratio of Fe3O4 to graphite on electromagnetic wave absorbing property of the composites was investigated. The results show that the intensity of Fe3O4 XRD increases with the increase of the adding amount of Fe3O4 in composites. The Fe3O4 nanoparticles mainly deposit on the surface of graphite particles. The Fe3O4 nanoparticles coat the graphite surface completely with the increase of the adding amount of Fe3O4 in composite and some Fe3O4 nanoparticles disperse between graphite par- ticles. The dielectric constant of composites decreases with the increase of Fe3O4 amount in compos- ites. The magnetic permeability is less affected by the amount of Fe3O4 in composite. The Fe3O4- graphite composites with mass ratio of 5：1 and 4：1 show better absorbing property than that of other samples. The sample of 5：1 shows maximum absorption value of -31.9dB and the frequency band- width of reflection loss over -10dB about 5.0GHz at the thickness of 1.5mm.