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This article investigates the electromagnetic wave-absorbing properties of SiC-based ceramic woven fabrics. The electrical conductivity of ceramic woven fabrics was modified by heat treatment in air, resulting in oxidation, and the electromagnetic wave absorption potential of single- and double-layer ceramic woven fabrics were determined in the 17–40 GHz frequency range using the free-space method. The absorption potentials of cera-mic woven fabrics of different chemical composition and weave were correlated with their material properties through X-ray diffraction, scanning electron microscopy,and electrical resistance measurement. The effect of the different arrangements of fabrics in multilayer forms, and how oxidation affects the electromagnetic wave absorption potential of the fabrics are discussed. Various double-layer combinations of SiC-based woven fabrics revealed prom-ising potentials for both reduced reflection and transmission, resulting in *90% absorption in the GHz range, which makes them powerful candidate materials for electromagnetic wave absorption applications. |
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本论文研究了碳化硅基陶瓷无纺布的电磁波吸收性能，在空气中对其进行不同的热处理，会导致生成氧化物，陶瓷无纺布的导电率也随之变化，通过自由空间法进行测量，氧化物决定了单层和双层陶瓷无纺布的电磁波吸收10-40GHz电磁波能力。通过X-射线衍射仪，扫描电子显微镜和电阻抗测量可以得知，材料属性影响了不同成分和编制工艺的陶瓷无纺布的吸收能力。 已经完成的研究包括：多层陶瓷无纺布中面料的不同顺序叠加的作用和氧化物对电磁波吸收能力的影响。多种双层结合的碳化硅基无纺布展示了其对减少电磁波反射及投射的莫大潜力，对于GHz范围内，减少率可达90%，因此，双层结合的碳化硅基在电磁波吸收应用中有光明的前景。 |
2楼2014-06-10 13:02:04
