CoFe_(2)O_(4)/生物质碳复合材料的制备与吸波性能

Preparation and microwave absorbing properties ofCoFe_(2)O_(4)/biomass carbon composites

采用一锅水热法及高温煅烧法制备了CoFe_(2)O_(4)/生物质碳复合材料。从材料微观形貌、晶体结构和电磁参数表征说明,CoFe_(2)O_(4)能够均匀分散在碳基材料中,CoFe_(2)O_(4)的存在有利于生物质在碳化过程产生缺陷极化,这有利于增强材料的吸波性能。通过调节CoFe_(2)O_(4)的含量,实现对复合材料电磁参数的有效调控,进而优化其阻抗匹配性能。实验结果表明,CoFe_(2)O_(4)/C-3.0复合材料在2.0 mm下获得最小反射损耗(Reflection loss RL)值为-48.0 dB,有效吸收带宽(Effective absorption bandwidth EAB)为5.5 GHz。

In this paper,CoFe_(2)O_(4)/biomass carbon composites were prepared by one-pot hydrothermal and high-temperature calcination methods.The microscopic morphology,crystal structure and electromagnetic parameters of the material indicate that CoFe_(2)O_(4)can be uniformly dispersed in the carbon base,and the presence of CoFe_(2)O_(4)is conducive to the defective polarization of the biomass during the carbonization process,which is beneficial to the enhancement of the wave absorption properties of the material.Effective regulation of the electromagnetic parameters of the composite material by adjusting the content of CoFe_(2)O_(4)to optimize its impedance matching performance.Experimental results show that the minimum reflection loss(reflection loss,RL)value of-48.0 dB and effective absorption bandwidth(effective absorption bandwidth,EAB)of 5.5 GHz were obtained at 2.0 mm thickness of CoFe_(2)O_(4)/C-3.0 composite.