纸质蜂窝夹芯的粘接技术

按纸质蜂窝夹芯材料的生产过程，较为详细地介绍了它的生产工艺和关键工序应掌握的技术以及各项工艺参数。     

蜂窝式压弯构件稳定极限承载力有限元分析

采用有限无分析软件ANSYS建模，通过对四种不同长细比及三种开孔率的蜂窝式压弯构件进行有限元分析，得出了长细比及开孔率对蜂窝式压弯构件弯矩作用平面内的极限承载力的影响。     

铜系催化剂选择性催化还原脱除NOx研究

以硅胶改性堇青石蜂窝陶瓷为载体，分别制备了以Cu-O、Cu-Ce-O和Cu-Ce-Mn-O为活性组分的催化剂。以CO(NH₂)₂为还原剂，在固定床反应器中进行选择性催化还原NO的研究。采用XRD、SEM和BET等测试方法对催化剂进行表征。结果表明，在温度(300～500) ℃，催化剂Cu-Ce-Mn-O/SiO₂/堇青石的活性优于催化剂Cu-O/SiO₂/堇青石和Cu-Ce-O/SiO₂/堇青石，反应温度为450 ℃、空速为8 000 h^-1时，Cu-Ce-Mn-O/SiO₂/堇青石催化剂催化还原NO的转化率可达到88%。     

FEM的焊接式蜂窝铝板疲劳性能研究

针对钎焊蜂窝铝板在不同应力下的疲劳寿命差异,采用有限元软件ANSYS在蜂窝芯的L方向和w方向上分析蜂窝芯边长和壁厚对蜂窝板疲劳寿命的影响．钎焊蜂窝铝板的s—N曲线结果表明,蜂窝板因为其内部蜂窝芯的排列方式不同而产生各向异性,L向的力学性能优于w向．当蜂窝芯子边长和壁厚都相同时,在相同的循环载荷下,蜂窝板的疲劳寿命值随着面板厚度的增加而增大,当面板厚度增加到一定值后,蜂窝板疲劳寿命是相同的．     

负载型V_2O_5-WO_3/TiO_2/堇青石脱硝催化剂的研制及性能

以TiO2/堇青石蜂窝陶瓷为载体,V2O5-WO3为活性组分,采用静态浸渍的方法制备了用于氨法选择性催化还原烟气中NO的SCR催化剂,通过XRD和BET对催化剂进行了表征,并考察了该催化剂的应用性能。考察了制备方法、温度、NO浓度、空速和NH3/NO对SCR反应的影响。结果表明,活性组分浸渍溶液中添加助溶剂对制备的催化剂活性有一定的影响,主要影响催化剂表面V2O5的聚集形态,导致脱硝活性下降;活性组分浸渍溶液中添加助溶剂时,可显著提高催化剂的脱硝活性,在反应温度为375℃、NH3/NO=1、空速为10 000h-1的条件下,所制备的催化剂的NO脱除率最高,可达99%。     

关于雷达罩蜂窝夹层结构连接的分析

本文从蜂窝夹层结构雷达罩连接处的连接方式、工艺、安装、老化、疲劳、蠕变等方面,对蜂窝夹层结构雷达罩连接进行了分析,简述了在设计雷达罩连接时应考虑到的一些情况,并对其进行了分析。总结了连接处八条设计原则,为实际设计、计算、结构优化连接接头提供了参考。     

纸基蜂窝芯材料磁场和摩擦吸附固持加工中铁粉填充优化方法的研究

针对纸基蜂窝芯材料磁场和摩擦吸附固持加工方法中铁粉填充效率较低的问题，提出一种优化的铁粉填充方法。利用有限元分析软件对蜂窝芯材料的力学性能进行分析计算，确定出正六边形区域划分边界的最大外接圆以及边界处的节点反力；通过实验测定铁粉填充孔格数、铁粉填充高度与摩擦力的关系；根据实验结果确定铁粉填充高度和填充孔格数。采用优化的铁粉填充方法可以减少70％的铁粉填充量，提高铁粉的填充效率。     

三种间位芳纶纸蜂窝力学性能及断口形貌分析

通过压缩性能、剪切性能和平面拉伸性能试验,对两种规格、三种牌号国产间位芳纶纸蜂窝与美国杜邦Nomex蜂窝的主要力学性能进行了对比分析;通过芳纶纸抗张强度试验,分析了芳纶纸性能对纸蜂窝主要力学性能的影响;通过微观下观察平面拉伸试样断口形貌,分析了纸蜂窝拉断时纤维和基体的破坏模式与其拉伸性能的关系。芳纶纸蜂窝主要力学性能试验表明,同种规格国产间位芳纶纸蜂窝的主要力学性能已基本达到Nomex蜂窝水平并且可满足目前国产大型客机选材要求。     

Development of a Novel Design for Diesel Particulate Filter

A novel design for diesel particulate emission filter based on wall structure of pore channels of honeycomb filter is proposed. Our anticipation in this new design is that, if whiskers are coated on walls of the pore channels of honeycomb filter, the trapping efficiency of honeycomb filter will be improved and also the pressure drop will be substantially reduced. In present study, cordierite whiskers were coated on cordierite based honeycomb support (diameter 13 cm, and height 14.5 cm, 600 cells/inch²) by in-situ method. Whisker coating was carried out on walls of the pore channels of cordierite support from aqueous slurry containing a mixture of kaolin, talc, alumina and silica. Coating was performed by wash coat method. Firing was carried out at 1350C for 4 h under flowing air atmosphere. XRD measurements revealed us complete formation of cordierite phase. SEM analysis on the coating showed the formation of three-dimensional network of cordierite whiskers on cordierite support. In order to evaluate the particulates trapping efficiency of the newly developed honeycomb filter, smoke test was carried out with a 2L diesel engine for the both un-coated and coated cordierite honeycomb samples and the results were discussed with respect to their microstructures.     

One-step dip-coating of uniform γ-Al2O3 layers on cordierite honeycombs and its environmental applications

Cordierite honeycomb with high loading and uniform coating of γ-Al₂O₃ was prepared by a facile one-step dip coating strategy. The γ-Al₂O₃ obtained loading, which was as high as 30%, could be calculated according to the different weight of bare and washcoated cordierite honeycomb. SEM micrographs showed that coarser surface and round channels were formed, demonstrating complete coverage of a γ-Al₂O₃ layer on cordierite. The coating thickness was 30 µm, corresponding very well to the theoretical value, indicating a homogeneous coating of γ-Al₂O₃. Besides, no crack was observed on the surface or the corner of the channel wall. The washcoat exhibited excellent adherence with no significant weight loss after 3 h ultrasonic treatment, attributing to the “nail-like” strong interaction between the support and the washcoat. The derived PdCl₂-CuCl₂ monolith catalyst showed excellent activity and stability for CO oxidation at room temperature in microreactor. The catalyst was also effective in pilot-scale test using the diesel exhaust as feed gas, presenting a great application prospect.