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

首先，我们在100MHz到10GHz的频率范围内使用网络分析仪，确定了与吸波有关的电磁特性的实验技术和评估。接下来，通过软化学技术和随后的两种不同的烧结方式：两步烧结和一步烧结，成功地制备了两种不同类型的新型Ni-Zn铁氧体SiC烧结复合材料作为电磁波吸收剂。平均直径约为30 μm的非晶态SiC颗粒均匀分布在Ni-Zn尖晶石铁素体基体中。在两步烧结法中，随着SiC用量的增加，复合材料的密度不断降低。发现烧结复合材料的吸收特性取决于SiC颗粒的数量。吸收中心频率在2GHz左右向高频偏移。此外，在一步烧结的方法中，我们首先获得了另一种新的电磁波吸波器，其中心频率分别为800MGz和8.6GHz，具有有趣的吸波性能。

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.