超细镍纤维复合材料的电磁屏蔽研究

Henan University, Kaifeng 475004, China

摘要:

在外加磁场的诱导作用下，采用常压液相还原法，制备较大量直径约为250 nm、长度可达100 μm的超细镍纤维。分别将得到的镍纤维和商品微米镍粉作为填料制备树脂基导电复合材料，在130 MHz~1.5 GHz的频段范围内测定复合材料的电磁屏蔽性能与镍填料含量的关系。结果表明，跟微米镍复合材料相比，镍纤维复合材料具有更好的电磁屏蔽性能。镍纤维含量为33.3%（质量分数）的复合材料的平均电磁屏蔽效果为15.7 dB。

Abstract:

With induction of external magnetic fields, ultrafine Ni fibers with length up to 100 μm and diameter of about 250 nm were fabricated by a liquid phase reduction method under normal pressure. Then the obtained Ni fibers and commercial microsized Ni powder were used as filler to fabricate resin-based conductive composites, respectively. The electromagnetic shielding effectiveness (SE) of the resultant resin-based conductive composites was measured as a function of nickel content in the frequency range from 130 MHz to 1.5 GHz. Results indicate that compared with the composite with microsized Ni powder, the resin-based composite with ultrafine Ni fibers shows better electromagnetic shielding effectiveness. The composite with 33.3% (mass fraction) Ni fibers possesses an average SE of 15.7 dB.