Development of Novel Electromagnetic-Wave-Absorber of SiC-Ferrite Hybrid Materials

首先，我们确定了利用100 MHz-10 GHz频率范围的网络分析仪进行吸波相关电磁性能的实验技术和评价。其次，通过软化学技术和两种不同的烧结方式：两步烧结法和一步烧结法，首次成功地制备了两种不同类型的Ni-Zn铁氧体-碳化硅新型烧结复合材料作为吸波材料。非晶态碳化硅颗粒平均直径约30μm，均匀分散在镍锌尖晶石铁氧体基质中。在两步烧结法中，随着碳化硅含量的增加，复合材料的密度不断降低。研究发现，烧结体的吸波特性与碳化硅颗粒的含量有关。吸收的中心频率在2 GHz左右向更高的频率移动。此外，在一步烧结法中，我们首次成功地研制出了另一种具有有趣的吸波性能的新型电磁波吸收材料，其中心频率约为800 MGz和8.6 GHz。

First, We firmed the experimental technique and evaluation of the electromagnetic properties concerning with wave-absorption by using an network analyzer for frequency range from 100MHz to 10GHz. Next two different types of novel sintered composites of Ni-Zn ferrite SiC were first succeeded to prepare as an electromagnetic-wave-absorber through a soft chemical technique and subsequent tow different manners of sintering : a two-step sintering and an one-step sintering. Amorphous SiC particles with an average diameter of approximately 30 μm dispersed uniformly in Ni-Zn spinel ferrite matrix. In the two-step-sintering method, the density of the composite decreased continuously as the amount of SiC increased. The absorption characteristics of the sintered composite were found to depend upon the amount of SiC particles. The center frequency of the absorption shifted toward higher frequency around 2GHz. Furthermore in the one-step-sintering method, we first succeeded another new electromagnetic-wave-absorber having interesting wave-absorption properties with the two different center frequencies of about 800MGz and 8.6GHz.