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介绍了吸波多晶铁纤维的制备装置和制备工艺,研究了反应温度、励磁电流、羰基铁流速及1次进样总量对多晶铁纤维的影响。通过实验,确定了多晶铁纤维的制备工艺为:反应温度400℃,励磁电流6A,羰基铁滴加速度1.0ml/min,1次进样总量为10ml。 相似文献
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综述了目前国内外宽频轻质吸波涂料的研究动态,详细介绍了具有发展前景的空心微珠吸波材料、碳纳米管吸波材料、导电高聚物吸波材料、纳米吸波材料和智能隐身材料等新型宽频轻质吸波涂料的最新研究状况,并对雷达隐身材料应用技术的未来做了展望。 相似文献
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结构型吸波复合材料具有吸波性能好、质量轻、可承载等优点,已成为当代吸波材料的主要发展方向,对隐身材料的设计和制造有着重要意义。本文从纤维增强体的截面形状和制备工艺、纤维的铺排结构和夹层复合结构、吸波剂改性等影响吸波复合材料吸波性能的主要因素出发,系统地总结了结构型吸波复合材料的最新研究热点和成果,并指出吸波复合材料的未来发展方向。 相似文献
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以硼玻璃粉为原料,炭黑为发泡剂,三氧化二铁为添加剂,制备得到泡沫玻璃基体。再以苯胺(An)为单体,过硫酸铵(APS)为引发剂,通过原位聚合法和乳液聚合法制备了导电聚苯胺/泡沫玻璃复合材料。采用FTIR、XRD和SEM对泡沫玻璃和复合材料的形貌、结构进行了表征,矢量网格分析仪测量了材料的电磁参数,并模拟计算了材料的反射损耗。结果表明,当炭黑含量为0.03wt%,炭黑和三氧化二铁的摩尔比为3:2时,制备的泡沫玻璃气孔尺寸在1mm-1.2mm,抗压强度在1.7MPa-2.45MPa。电磁参数测试和反射损耗的结果表明,当聚苯胺的浓度为0.1mol/l时,复合材料的吸波性能最好。原位聚合所得复合材料最小反射损耗为-12.56dB,有效带宽为2GHz(8.2GHz-10.2GHz)。乳液聚合所得材料最小反射损耗为-13.38dB,有效带宽为2.2GHz(8.2GHz-10.4GHz)。 相似文献
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碳纤维增强环氧树脂基复合材料的性能研究 总被引:1,自引:0,他引:1
研究了WBS-3环氧树脂固化体系的反应特性,分析了该固化体系浇铸体的性能;并以碳纤维(T-700S)为增强材料,采用手糊成型螺栓加压工艺制备了WBS-3/T-700S复合材料,研究了复合材料的常温力学性能、高温力学性能、水煮后力学性能和动态力学性能,并对弯曲断面进行分析。研究结果表明,WBS-3树脂基体黏度低、适用期长且韧性好,适合于手糊成型、缠绕成型等低成本制造工艺;由此制得的WBS-3/T-700S复合材料具有优良的力学性能和耐高温性能,其弯曲强度为1434MPa,拉伸强度为1972MPa,剪切强度为76.1MPa,玻璃化温度(Tg)超过210℃;该WBS-3/T-700S复合材料具有很好的界面粘接性(树脂对纤维的浸润性良好)、较低的空隙率且纤维分布均匀。 相似文献
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《Journal of the European Ceramic Society》2020,40(5):2013-2019
A series of challenges are impeding the development of high temperature electromagnetic (EM) wave absorbing materials in x band. In this study, to deal with this problem, a coating, (1-x).wtAl2O3∼x.wtTiC, is designed and prepared using plasma spraying technology. Its permittivity increases with temperature and TiC content, which endows it with a good EM impedance at high temperature. The coating possesses excellent EM absorbing performance at 800 ℃. When the x value equals 0.2 and thickness 1.6 mm, the coating exhibits an EAB of 3.45 GHz at 800℃, and a reflection loss lower than -8 dB in whole x band. The XRD result shows that only two phases exist in the coating. The SEM images illustrate that TiC is unevenly dispersed in Al2O3, causing loss of conductivity and interface polarization. The finding not only broadens the application of TiC-based materials but also indicates the promising future of this material system. 相似文献
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复合型高效吸油滤片处理含油废水的研究 总被引:1,自引:0,他引:1
制备出有机/无机复合型高效吸油滤片,并将其用于含油废水的处理.研究结果表明,当滤片组成成分m(粉煤灰超细纤维):m(高吸油树脂)为85:15,废水水样pH为10,流量为2 mL/min,温度为60℃时,滤片吸油率97.93%,脱油率94.00%,废水含油质量浓度从398 mg/L降低至8.50 mg/L,达到污水综合排放一级标准. 相似文献
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Effect of composition and annealing on the dielectric properties of ZnO/mullite composite coatings 总被引:1,自引:0,他引:1
ZnO/mullite composite coatings were fabricated by atmosphere plasma spraying technology (APS). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to investigate the microstructures and compositions of the feedstock and coatings. The permittivity-frequency properties were determined in the microwave frequency range of 8.2-12.4 GHz by network analysis. Our results show that both the real and imaginary part of permittivity increase greatly with increasing ZnO content over the frequency range of 8.2-12.4 GHz, which can be ascribed to interfacial polarization and orientation polarization. However, the composite coatings after 900 °C annealing for 5 h show much lower permittivity, due to the decrease of ZnO content resulting from the further reactions between the ZnO and mullite. Results indicate that the composite coating has excellent permittivity in room temperature, while for high temperature application, more investigation should be done. 相似文献
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采用炭纤维、玻璃纤维、环氧树脂和纳米碳管制备了结构吸波材料。通过实验和理论计算研究了MWCNTs含量对单层结构吸波材料的吸波性能的影响和层间排列方式对双层结构吸波材料吸收性能的影响。对于单层的结构吸波材料,当MWC-NTs的含量为9%时吸波效果最佳,吸收率超过-10dB的有效带宽为5.4GHz;对于双层结构吸波材料,当层间排列为MWCNTs15%MWCNTs3%时,最大吸收率为-39.3dB、吸收率超过-10dB的有效带宽为6.5GHz,涵盖了整个Ku频率范围(12~18GHz),更能满足"强、宽、薄"的要求。 相似文献