首先利用溶胶-凝胶法制备SiO_2-SiC复合粉体,采用SEM、XRD、DSC-TG等技术对复合粉体进行表征.结果表明,溶胶-凝胶法能够制备具有核-壳结构SiO_2-SiC复合粉体.再将SiO_2-SiC复合粉体与BaTiO_3、Fe_3O_4以及环氧树脂以不同比例进行混合固化制得吸波材料样品,采用矢量网络分析仪测量样品的反射率.结果表明,SiO_2-SiC复合粉体具有一定的吸波效果,20%含量的SiO_2-SiC复合粉体样品在18 GHz时反射率达-2.07 dB,BaTiO_3、Fe_3O_4的加入实现复合吸波效果,当SiO_2-SiC:BaTiO_3:Fe_3O_4=6:2:2(体积分数,下同)时,在5.75 GHz时反射率达到-13.97 dB,合格带宽为10.08 GHz.
SiO_2-SiC composite particles were prepared by using a sol-gel process. The techniques of SEM, XRD and DSC-TG were used to characterize the phase and microstructure of the as-obtained SiO_2-SiC particles. The results show that a core-shell structure was constructed in the composite particles with the core of SiC and the shell of amorphous SiO_2. The microwave absorbents were blended and solidified with epoxide resin , SiO_2-SiC composite particles, BaTiO_3 and Fe_3O_4 powders with various ratios. The vector network analyzer was used to measure the reflectivity of the SiO_2-SiC matrix composites, the result shows that SiO_2-SiC composite particles could absorb microwave, the reflectivity of the sample with 20 wt% SiO_2-SiC particles is -2.07 dB at 18 GHz, adding BaTiO_3 and Fe_3O_4 powders, the reflectivity of composite absorbents could be -13.97 dB at 5.75 GHz while eligible frequency range is 10.08 GHz.
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