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After the investigation of the double-layer as-received woven fabrics, the absorption potentials of samples of both as-received and heat-treated layer double-layer combinations were examined. The absorption potentials of combinations of PN-H and heat-treated S8 (S8-H) fabrics with as-received ZE8 fabrics at various frequencies are compared in Table 4. It can be observed that a combination of S8-H fabrics had a slightly higher absorption potential than one of PN-H types. As there is little difference in the conductivity of heat-treated S8- and PN-type woven fabrics, the better absorption potential of the S8-type woven fabrics is believed to be a result of its smoother surface, which eliminates internal reflections. In the final case, double-layer combinations of heat-treated fabrics were assembled. Table 5 lists the absorption potential of all combinations of heat-treated fabrics. The S8-H and ZE8-H combination proved to have the best absorption potential among all samples. In the heat-treated condition, the ZE8 revealed the highest conductivity due to localized oxidation, and combinations containing the ZE8-H fabric as the second layer resulted in better absorption. A double-layer combination of ZE8-H-type woven fabrics did not improve its electromagnetic wave absorption property, as the high conductivity of the combination strengthened reflection loss. The surface condition of the fabrics was also important in their electromagnetic wave absorption potentials. The S8 and ZE8 samples had a satin weave, and hence their surfaces were smoother than that of the plain type PN. As the smoother surface suppressed multiple reflection losses from the surface of the materials, the surface characteristics of a fabric can also be said to be important for electromagnetic wave absorption. The absorption potentials of double-layer combinations of S8 and ZE8 fabrics are shown in Fig. 8. As-received and S8-H- and ZE8-type combinations revealed similar absorption potentials, which are higher than 90% in the 18.5–26.5 GHz frequency range. This result demonstrates that heat treatment did not necessarily mean an improvement in the absorption potential of SiC-based ceramic woven fabrics, but rather that heat treatment may be used to create woven fabrics with different electrical conductivities. In this regard, with a proper sequence of woven fabrics (low-conductivity layer before high-conductivity layer), better absorption potentials can be achieved. However, if a high electrical conductivity layer is placed in front of a low-conductivity layer, the absorption potential of the combination decreases (Fig. 8), since a significant portion of the incident electromagnetic waves were reflected from the surface before transmitting through the material. The high absorption potential of the double-layer combinations of SiC-based ceramic woven fabrics in the GHz range renders them useful as electromagnetic wave-absorbing material systems. |
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reko34
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wanghaiju: 金币+38, 翻译EPI+1, ★★★★★最佳答案 2014-06-12 12:31:00
wanghaiju: 金币+38, 翻译EPI+1, ★★★★★最佳答案 2014-06-12 12:31:00
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研究了双层收货状态的织物后，检验收货状态和经热处理后的双层组合样件的吸收能力。PN-H和热处理后S8（S8的ZE8织物在不同频率下吸收能力的对比如表4所示。可以发现S8-H织物的组合有略高于PN-H类型的吸收能力。由于热处理后S8和PN类型织物的电导率区别很小，有理由认为S8类型织物较好的吸收能力源于能消除内部反射的较平滑表面。 最后一例组合了双层热处理后织物。表5列出了各种热处理后织物组合的吸收能力。S8-H和ZE8-H的组合证实具有所有样件中最好的吸收能力。热处理状态下，ZE8因局部氧化表现出最高的电导率，将ZE8-H织物作为第2层的组合因此具有更好的吸收能力。双层ZE8-H类型织物的组合没有改进电磁波吸收性能，因为组合的高电导率增强了反射损失。 织物的表面状态对其电磁波吸收能力也有重要。S8和ZE8样件使用缎纹编织，因此表面较平纹的PN型更平滑。由于平滑的表面抑制材料表面的多重反射损失，也可以说织物的表面特性对电磁波吸收很重要。S8和ZE8织物双层组合的吸收能力如图8所示。收货状态及热处理后的S8和ZE8型的组合显示出相似的吸收能力，在18.5-26.5GHz频率范围高于90%。结果显示，热处理对基于SiC的陶瓷织物的吸收能力没有明显改进，但可用于制作不同电导率的织物。因此，适当的织物组合（低电导率层在高电导率层之前）能产生更好的吸收能力。然而如果高电导率层放在低电导率层之前，组合的吸收能力降低（图8），因为相当部分的入射电磁波在穿过材料前从表面反射。 基于SiC的陶瓷织物的双层组合在GHz范围的高吸收能力使它们成为有用的电磁波吸收材料系统。 |
2楼2014-06-12 10:18:13