Ni-P/膨胀石墨复合材料的制备及电磁屏蔽性能

摘要

用化学镀方法将镍磷合金负载在膨胀石墨(EG)表面上从而制备了Ni-P/EG复合电磁屏蔽材料.扫描电镜观察表明,这种用化学镀制备的镍磷镀层紧密地附着在膨胀石墨基体上.X射线衍射分析显示,制备态镍磷镀层呈非晶态,经500℃热处理晶化后镀层呈多相结构.磁测量结果证实非晶镀层饱和磁化强度较低,热处理晶化后饱和磁化强度增大、矫顽力较小,呈软磁性.当晶化后的镍磷/膨胀石墨复合材料面密度为0.96 kg/m2时,按SJ20524-95标准测得的电磁屏蔽效能在300kHz～1.5GHz范围内达到54～75 dB.%Ni-P alloy was loaded on the surface of expanded graphite (EG) by chemical plating to prepare a Ni-P/EG composite with electromagnetic radiation shielding effectiveness. Scanning electron microscope (SEM) results showed that the Ni-P layer was adhered tightly to the surface of EG. The X-ray diffraction (XRD) patterns and the magnetic measurements of the composite revealed that this chemical plated Ni-P layer is amorphous and had a low saturation magnetization. After crystallized at 500℃ for 3h in N2 atmosphere, the Ni-P layer demonstrates multi-phase components and its saturation magnetization increases and coercivity decreases, presenting soft magnetism. The electromagnetic shielding effectiveness (SE) measured according to the SJ20524-95 standard for crystallized Ni-P/EG composite with areal density of 0.96 kg/m2 was 54 to 75 dB in the range of 300 kHz to 1.5 GHz.