Fabrication of Electromagnetic Absorber Composed of Ferrite Particles with Shape Anisotropy

一个由铁氧体颗粒组成的宽带电磁吸收器，形状的异向已被描述;通过通量方法确定的方法获得动态和平台铁氧体颗粒的条件。Ferrite-聚合物复合物已准备好和电磁吸收被评估在与那些来自equiaxferite颗粒的比较中。1）微<Fe_2>粒子与平均流变仪的距离为<O_3>0.3至20<micro>米，并将它们转换成保留在含有其原始形状纸的适当条件下的NiZn或MnZn ferite。Fine NiO和KCl是NiZn ferrite的必需品，一个高熔点通量<K_2><SO_4>，需要<N_2>MnZn ferrite的大气层。适用于NiZn和MnZn铁氧体的最佳准备温度为900 °和1150 ° C。2）Ferrite-聚合物复合材料展示了比相同平均颗粒大小的宽和低共振频率更好的由均衡铁氧体颗粒准备的频率。

A wide-band electromagnetic absorber composed of ferrite particles with shape anisotropy has been described.Conditions for obtaining acicular and platy ferrite particles by the flux method were determined. Ferrite-polymer composites were prepared and electromagnetic absorption was evaluated in comparison with those from equiaxed ferrite particles.1) Micaceous <Fe_2> <O_3> particles with average diameters ranging 0.3 to 20 <micro> m were prepared by the flux or hydrothermal method, and they were converted to NiZn or MnZn ferrite under the appropriate conditions with their original shape preserved. Fine NiO and KCl were essential for NiZn ferrite, and a high melting-point flux like <K_2> <SO_4> and <N_2> atmosphere were required for MnZn ferrite. The optimum preparation temperature was 900゜ and 1150゜C for NiZn and MnZn ferrite respectively.2) Ferrite-polymer composites exhibited a wider and lower resonance frequency than those prepared from equiaxed ferrite particles with the same average particle size.