Ld_2O_3掺杂对Ni-Zn铁氧体/泡沫铝复合材料吸波性能的影响

为了研究掺杂Ld2O3对Ni-Zn铁氧体/泡沫铝材料吸波性能的影响,在泡沫铝表面涂覆了单一Ni-Zn铁氧体和掺杂不同质量分数的Ld2O3的Ni-Zn铁氧体复合粉,利用GJB2038—94"雷达吸波材料反射率测试方法"中的雷达截面(RCS)法对材料微波反射率进行了测量,扫描电镜(SEM)对吸波剂的形貌进行了分析.结果表明,在12~18 GHz频段内,涂覆添加Ld2O3后泡沫铝复合材料的吸波性能优于涂覆单一的Ni-Zn铁氧体.在26.5~40.0 GHz频段内,Ld2O3质量分数为1%的泡沫铝复合材料吸波性能最好,当其质量分数大于1%时,材料吸波性能降低.因此,在泡沫铝合金表面涂覆适当比例的Ni-...

Effect of Ld_2O_3 Doping on Wave Absorbability of Ni-Zn Ferrite/Al-Alloy Foams Composite

To investigate the effect of Ld2O3 doping on the microwave absorbability of Ni-Zn ferrite/Al-alloy foam composite, the surface of Al-alloy foam was separately coated with Ni-Zn ferrite and Ld2O3-doped Ni-Zn ferrite powdered composite (with different contents of doping). The coated Al-alloy foams were tested according to the Standard GJB2038-94 "method to test the reflectivity of radar absorbing materials", i.e., the RCS (radar cross-section) method. The topography of wave absorbent was analyzed through scanning electron microscopy (SEM). The results indicated that in the 12~18 GHz band the wave absorbability of the Al-alloy foam sample coated with Ld2O3-doped Ni-Zn ferrite is better than the sample coated with simple Ni-Zn ferrite. However, in the 26.5~40 GHz band, the best wave absorbability belongs to the Al-alloy foam coated with the powdered composite absorbent in which the Ld2O3 content is 1wt%, and the absorbability goes down if the content is higher than 1wt%. So, the absorbability of the Al-alloy foam coated with the powdered composite of Ni-Zn ferrite to which the content of Ld2O3 doping is appropriate can be improved further.