【摘要】 通过调整发泡温度、发泡时间、保温时间及发泡剂加入量等工艺参数,采用熔体转移发泡法制备不同相对密度的Al-Si闭孔泡沫铝。利用法蓝同轴法测试其电磁屏蔽效能,结果表明:电磁干扰频率对其屏蔽效能影响显著,在10~600MHz范围内,随着干扰频率增加,泡沫铝屏蔽效能逐渐减小,在600~1500MHz范围内,屏蔽效能又逐渐增加。相对密度对Al-Si闭孔泡沫铝材料电磁屏蔽效能影响不大。更多还原

【Abstract】 Though adjusting foaming temperature,foaming time,heat preservation time and vesicant addition etc.technological parameters,Al-Si closed-cell aluminum foams of different densities are prepared by using molten body transitional foaming process in Northeastern University of China.Testing its electromagnetic shielding effectiveness using method of falan coaxial,the results show that the shielding effectiveness of material is affected obviously by the electromagnetic interference frequency.With the interference frequency increasing from 10～600MHz,shielding effectiveness of aluminum foam decreases gradually;and increases when frequency from 600～1500MHz.The influence of relative density on electromagnetic shielding effectiveness is not obvious.更多还原