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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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采用化学沉积法使TiO2以纳米粒子的形式包覆于空心玻璃微珠表面,成功制备了TiO2纳米晶/空心玻璃微珠复合填料,并以改性微珠及空心玻璃微珠作为填料制备隔热涂料,对其光反射性能、隔热效果、隔热效果的影响因素进行了研究。结果表明,TiO2在空心玻璃微珠表面包覆效果良好,且经过热处理后空心玻璃微珠破损率很低。以改性微珠作为填料制备的涂料,涂膜对太阳光主要能量波段的光反射性能得到显著提高,其隔热效果较普通外墙涂料和空心玻璃微珠涂料相比有了明显的提高,且改性微珠添加量的多少对隔热温差的影响要大于厚度和白度对隔热温差的影响。 相似文献
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热处理温度对空心复相陶瓷微珠结构与微波电磁性能的影响 总被引:1,自引:0,他引:1
利用将火焰热喷涂技术、自蔓延高温合成技术及快速冷却凝固技术结合在一起的自反应淬熄法制备了前驱体空心复相陶瓷微珠,然后通过热处理获得了钡铁氧体空心复相陶瓷微珠吸波材料,研究不同热处理温度(600、850、1 100℃)对其形貌、相结构、相的相对含量与微波电磁性能的影响。结果表明:随着热处理温度的升高,空心微珠的表面出现晶粒并逐渐长大,发育逐步充分,1100℃时出现明显的六角晶型物相;主相BaFe12O19和副产物相BaAl12O19含量之和逐渐升高,复介电常数的实部ε′和虚部ε′′逐渐降低,复磁导率的实部μ′和虚部μ′′在一定频段范围内有增大趋势;空心微珠吸波性能逐步增强。当热处理温度为1 100℃时,空心微珠的最低反射率为–19.5 dB,低于–10 dB的频带为8.7~10 GHz和15~17.3 GHz,带宽达到3.6GHz,优于未热处理、600、850℃热处理温度下的吸波性能。 相似文献
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Lei Zhang Fengxia Xin Shaofu Li Yafeng Yang Qingshan Zhu Gang Wang 《Journal of the American Ceramic Society》2019,102(8):4492-4501
A novel method of incorporating fluidized bed chemical vapor deposition (FBCVD) with electroless plating was developed to effectively prepare the core-shell structured high-Ni-content WC–Ni composite powders. FBCVD offered a unique approach to decorating Ni particles on WC particles. The small Ni particle acted as an active catalyst to effectively produce high-Ni-content composite powders in the subsequent electroless plating process. The particle size and quantity of decorated Ni particle determined the electroless plating rate. FBCVD pretreatment temperature and time had a conflicting influence on obtaining both the fine size and large quantity of deposited Ni particles. For the conditions tested, the maximum electroless plating rate of 2.93 mg / g/min was obtained using an optimal FBCVD pretreatment at 750°C for 5 minutes, corresponding to a 0.11 wt. % Ni deposition and 50 nm particle size. 相似文献
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低铂燃料电池催化剂铂载量低,在具有较高活性的同时能够极大地降低燃料电池的成本,因此,开发低铂燃料电池催化剂一直是燃料电池催化剂的重要研究方向。本文综述了低铂燃料电池催化剂的最新研究进展,对低铂燃料电池催化剂进行了分类,包含Pt基合金结构催化剂、Pt基核壳结构催化剂、Pt单原子层结构催化剂和Pt单原子催化剂等;详细介绍了几种低铂燃料电池催化剂的制备方法,主要包括有机溶胶法、电化学还原沉积法、气相沉积法、原子层沉积法、离子液体法、微波法,并对各自的优缺点进行了总结;重点强调了核壳结构电催化剂的制备方法,包括两步有机溶胶法、脉冲电沉积法、表面去合金化法、欠电位沉积法以及中空构型核壳结构催化剂的制备。最后指出可控制备具有高活性和高稳定性的低铂核壳结构催化剂是质子交换膜燃料电池实现商业化的重要研究方向。 相似文献
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综述纳米线的主要制备方法:激光烧蚀法、化学气相沉积法、热气相沉积法、横板法、水热法等,以及目前纳米线的研究进展。 相似文献
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石墨烯/导电聚合物复合材料不仅具有石墨烯优异的屏蔽性能和导电聚合物良好的氧化还原特性,还能协同发挥二者的功能,在金属防腐蚀领域有着巨大的应用潜力。本文综述了石墨烯/导电聚合物复合防腐蚀材料的制备方法,包括电化学方法、化学氧化法、分散液混合法和化学气相沉积法(CVD);并全面总结了石墨烯/导电聚合物复合材料在防腐蚀涂层中的应用及性能。制备的石墨烯/导电聚合物复合材料可以通过电化学方法、溶剂挥发法制成石墨烯/导电聚合物防腐蚀薄膜涂层,还可以混入成膜物树脂中制备树脂复合防护涂层。讨论了石墨烯/导电聚合物在制备过程、薄膜涂层和树脂复合涂层应用中的优势与不足,提出了构建结构可控、综合性能好的复合防腐涂层是石墨烯/导电聚合物复合防腐蚀材料的未来主要发展趋势。 相似文献
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A composite structure consisting of hollow nickel microspheres coated with oriented carbon nanotubes (CNTs) was synthesized via chemical vapor deposition at 800 °C. The hollow microspheres were composed of discrete Ni nanoparticles which acted as the catalyst. FESEM images showed that the CNTs grew on the surface of the Ni spheres. HRTEM, Raman and XRD analyses showed that the CNTs were highly graphitized. Magnetic measurements demonstrated that these composite structures exhibited enhanced ferromagnetic behaviour compared with hollow Ni spheres and bulk Ni. 相似文献
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Anitha Nithyanandam Thenmuhil Deivarajan 《International Journal of Applied Ceramic Technology》2021,18(5):1825-1831
Cenosphere-based composite was developed with addition of clay and other additives, by dry processing route. The performance of cenosphere as high-temperature insulating material was studied. Cenosphere stands unique among the constituents found in fly ash due to its hollow spherical structure. Cenosphere is utilized in numerous modern applications due to its unique properties such as lightness, high compressive strength, enhanced flow characteristics, less water absorption, chemical inertness, and good thermal resistance. Keeping cenosphere as major component, three different mix recipes for insulating brick were made. The recipes were blended and shaped by pressing, followed by drying and sintering at 1000°C. The prepared samples were analyzed for their physical, mechanical, and thermal properties. The surface and pore distribution are analyzed by scanning electron microscope. Results from the analysis shows that cenosphere can be used as high temperature insulating material. 相似文献
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本文论述了AIN陶瓷粉末的三种典型制备方法—铝粉氮化法、还原氨化法和化学气相淀积法,总结了AIN粉末的生成机理以及影响AIN粉末质量的主要因素,理论分析了AIN粉末制备过程中的有关实验现象.评述了AIN粉末制备方法的优缺点,给出了大量工艺参数. 相似文献
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《国际聚合物材料杂志》2012,61(3-4):249-252
Abstract Preparation of ultra thin organic and polymer films could be divided into two methods. One is the wet process such as Langmuir-Blodgett (LB), spreading, dipping and casting methods. The other is dry processing, such as vapor deposition, sputtering, chemical vapor deposition, plasma polymerization and vapor deposition polymerization methods. Of these methods, the LB method has been attractive for the last decade to prepare a monolayer film, however, the vapor deposition method has also attracted attention for the preparation of well organized ultra thin films. It is important to investigate a molecular assembly in terms of the extent of aggregation, the crystalline regularity and their orientation in the thin film, since they are closely related to the physical, electrical and functional properties. This review focuses on an evaluation of the structure, molecular assembly and orientation in the thin films prepared by the LB and vapor deposition methods. 相似文献