共查询到18条相似文献,搜索用时 140 毫秒
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微波能、有机粘合剂对蜂窝陶瓷快速稳定干燥的影响 总被引:2,自引:0,他引:2
本文介绍了蜂窝陶瓷体在干燥过程中,有机粘合剂在微波场的作用下,产生凝固、收缩,并且在蜂窝陶瓷体内形成网络结构,使蜂窝陶瓷体内部存在的应力和缺陷得到分散和固定,从而达到稳定干燥的目的;蜂窝陶瓷体自身吸收微波能产生热量,其热量流动方向与水份迁移的方向一致,为快速稳定干燥提供了重要条件;以及在负载量、材料性质一定的情况下,蜂窝陶瓷体的壁厚是影响其干燥速度的重要因素,而与蜂窝陶瓷体的形状、尺寸没有很大关系。 相似文献
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超低热膨胀堇青石质蜂窝陶瓷 总被引:2,自引:0,他引:2
本文介绍了堇青石质蜂窝陶瓷的超低热膨胀特点,分析了其超低热膨胀机理,阐述了影响堇青石质蜂窝陶瓷超低胀系数的主要工艺因素,指出制备超低热膨胀系数的堇青石质蜂窝陶瓷的主要途径。 相似文献
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本文针对高风温燃烧技术和煤矿乏风瓦斯氧化技术的蜂窝陶瓷蓄热体,系统地综述了影响蓄热体抗热震性的因素,数值模拟分析了蓄热体在热冲击下的温度场和热应力场的分布特点,总结了蜂窝陶瓷蓄热体热震损伤机理等的研究进展情况,并提出今后的研究及发展方向。 相似文献
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High strength and microwave-absorbing polymer-derived SiCN honeycomb ceramic prepared by 3D printing
《Journal of the European Ceramic Society》2022,42(4):1322-1331
The combination of 3D printing technology and polymer-derived ceramic route provides an attractive strategy to construct microwave-absorbing honeycomb with fine structure through flexible process. However, preparation of honeycomb ceramics with both excellent mechanical and microwave-absorbing properties is still challenging. Herein, SiCN honeycomb ceramic was fabricated by stereolithography from UV curable polymeric precursor consisting of polysilazane and multifunctional acrylates. By optimizing the multifunctional acrylates and its ratio, the decomposition of organic moiety and the ceramization process of precursor are matched, rendering the achieved ceramic with high compactness. The hardness and specific compressive strength of SiCN honeycomb ceramic reach as high as 14.3 GPa and 333.3 MPa/(g·cm3), respectively. Meanwhile, at low pyrolysis temperature, the copolymerized acrylate and polysilazane that formed during curing process was converted to free-carbon nanodamins in-situ, which endows SiCN honeycomb ceramic with the minimum reflection loss of –49.0 dB, namely microwave absorption rate over 99.99%. 相似文献
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针对柴油发动机蜂窝陶瓷过滤器在回收处理过程中易破坏这一问题,提出了在原过滤间壁外加涂带催化剂的多孔陶瓷涂层方法,改进挤出成形蜂窝陶瓷过滤间壁气孔密度的分布。 相似文献
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The activity of ceramic honeycombs with varying material composition and degree of utilization is compared on a suitable model gas in a test plant. The tested honeycombs are standard products that have not been surface‐treated in any way. A propane‐air mixture was fed to the test plant and then oxidized in a high‐temperature furnace. The analysis of the conversion rate over the reaction temperature showed remarkable differences in activity. The honeycomb with the most promising results was further investigated with the exhaust gas from the drying process of a waste treatment plant. Finally, the activity of this honeycomb was assessed in a large‐scale trial in an existing running regenerative thermal oxidizer. 相似文献