利用专利技术制备了开孔泡沫Fe-Ni材料,并对其电磁屏蔽效能进行了研究.结果表明,在0.03～1500 MHz的频率范围内,开孔泡沫Fe-Ni的屏蔽效能在60～85 dB之间,屏蔽效能良好;而在0.03～400 MHz范围内,其屏蔽效能与铝合金板的屏蔽效能相当.开孔泡沫Fe-Ni的电磁屏蔽效能主要受泡沫结构的影响,随着开孔孔径以及泡沫体孔隙率的减小其电磁屏蔽效能增加显著.而当材料的孔径以及厚度一定时,泡沫体孔隙率的变化对电磁屏蔽效能的影响较其他因素小.
The electromagnetic interfering (EMI) shielding properties of open-pore Fe-Ni foams prepared by a patented technique in the frequency range from 0.03 MHz to 1500 MHz was investigated using a coaxial cable method. The results indicate that the open-pore Fe-Ni foams exhibit high shielding effectiveness (SE) between 60 dB and 85 dB in the whole frequency range, but the SE value of the foams is similar to that of aluminum alloy sheets in the frequency range from 0.03 MHz to 400 MHz. Moreover, the SE value of open-pore Fe-Ni foams is determined by the foam structure such as pore size and porosity. The SE value increases significantly with the open-pore size and porosity decreasing. However, the porosity change influences the SE value less than other factors when the pore size and thickness is certain.
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