磁介质吸波剂/多孔金属材料吸波性能

为了研究磁介质吸波剂/多孔金属材料吸波性能,在泡沫铝合金表面涂覆了Ni-Zn铁氧体(CFe)、羰基镍粉(CNi)以及二者的复合粉,利用GJB 2038—94"雷达吸波材料反射率测试方法"中的雷达截面(RCS)法对该材料的微波反射率进行了测量.结果表明,在12～18GHz频段内,复合磁介质吸波剂/泡沫铝材料吸波性能介于单一吸波剂样品CFe与CNi之间;在26.5～40 GHz频段内,羰基镍质量分数为40%的泡沫铝复合材料吸波性能最好,当其质量分数大于40%时,材料吸波性能逐渐降低.因此,在泡沫铝合金表面涂覆适当比例的Ni-Zn铁氧体与羰基镍复合粉,可以进一步改善材料的吸波性能.

Wave Absorbability of Porous Metal Coated with Magnetic Medium Absorbent

Studies on the wave absorbability of magnetic medium absorbent/Al-alloy foams of which the surface were separately coated with Ni-Zn ferrite (CFe), nickel carbonyl (CNi) and the powdered compound of them. The coated Al-alloy foams were tested according to the Standard GJB 2038-94 'method to test the reflectivity of radar wave absorbing materials', i.e., the RCS (radar cross-section) method. The results indicated that in the 12-18 GHz band the wave absorbability of Al-alloy foams materials coated powder compound absorbent is founded between that of Al-alloy foams samples CFe and CNi which were coated with single absorbents samples. But in the 26.5-40.0 GHz band, the best wave absorbability belongs to Al-alloy foams coated powder compound absorbent in which the nickel carbonyl content is 40wt%, and the absorbability goes down gradually if the nickel carbonyl content is higher than 40wt%. So, the absorbability of Al-alloy foams coated powder compound of Ni-Zn ferrite in reasonable proportion to nickel carbonyl is available to be improved.