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将适量羰基铁吸收剂填充到发泡体系中,采用一步法制备了形貌结构良好的硬质聚氨酯基羰基铁泡沫吸波材料(CIPRPU)。用扫描电子显微镜和矢量网络分析仪对样品的结构及电磁性能进行了表征。结果表明,吸收剂的填充量对电磁参数影响较大,整体上呈现出随吸收剂的填充量升高,电磁参数变大的趋势。CIPRPU的介电常数ε′和ε′′分别在3.0和0.5以下,磁导率μ′和μ′′则分别在1.5和0.5以下。利用测得的电磁参数对CIPRPU的反射率进行了模拟。当厚度为3 mm时,在X波段内,CIPRPU(m(聚氨酯基体):m(吸收剂)=1:5)的峰值吸收达到了–22 d B,表明制备的泡沫型吸波材料能够充分利用其独特的孔结构,使材料由单纯的吸收作用转变为透波–吸波作用,取得了较好吸波效果。
An appropriate amount of carbonyl iron absorbent was filled into the foaming system. A one-step process was used to prepare the rigid polyurethane-carbonyl iron foam absorber (CIPRPU). The structure and electromagnetic properties of the samples were characterized by scanning electron microscopy and vector network analyzer. The results show that the loading of the absorbent has a great influence on the electromagnetic parameters, and as a whole, the loading of the absorbent increases and the electromagnetic parameters become larger. The dielectric constants ε ’and ε “of CIPRPU are below 3.0 and 0.5, respectively, and permeability μ’ and μ” are below 1.5 and 0.5, respectively. Reflectance of CIPRPU was simulated using the measured electromagnetic parameters. At a thickness of 3 mm, the peak absorption of CIPRPU (m (polyurethane matrix): m (absorber) = 1: 5) reached -22 d B in the X band, indicating that the prepared foam absorbing material can sufficiently With its unique pore structure, the material is changed from pure absorption to transparent wave-absorbing effect, and good absorbing effect is achieved.