纤维多孔陶瓷作为复合蓄热材料基体的可行性研究

混合烧结法与熔融浸渍法是目前复合蓄热材料的两种基本制备方法，自发浸渍法是无机盐／多孔基体复合蓄热材料较佳的制备工艺。结合自发浸渍工艺原理的分析，对蜂窝陶瓷、添加造孔剂制备的多孔陶瓷与纤维多孔陶瓷在孔隙率、孔结构及力学性能等方面进行了比较。纤维多孔陶瓷凶其高孔隙率（可达95%以上）、优良的连通孔结构及特殊的断裂力学性能，可用作复合蓄热材料基体。纤维多孔陶瓷用于复合蓄热材料基体可有效地解决普通多孔基体中相变材料含量低、熔融物易溢出及抗热震稳定性差等问题。     

蓄热储能多孔陶瓷材料

本文介绍了蓄热储能材料的类型和特点,并对常用多孔陶瓷蓄热体的制备技术进行了分析,阐述了蓄热材料在工业和日常生活中的应用。     

新型陶瓷换热器用蓄热材料的选择

综述了陶瓷换热器用蓄热体材料的基本性质 ;从材质和形状两个方面详细探讨了蓄热体对陶瓷换热器的热工性能、使用寿命和烟气余热回收率的影响 ,并给出选择合适蓄热体的一些建议 ;同时 ,总结了现有蓄热体的一些性能参数 ,为陶瓷换热器的设计提供了必要的物理、热工数据     

二氧化锆多孔陶瓷的制备

在溶胶共沉淀法制备ZrO2的基础上,利用高分子悬浮聚合技术,将具有单一分散性的造孔剂球形聚甲基丙烯酸甲酯（PMMA）（700nm）和ZrO2分别制成悬浮液,通过混合、真空抽滤、煅烧的工艺,制备出孔径尺寸可控,孔径分布均匀的ZrO2多孔陶瓷.用X-射线衍射（XRD）和扫描电子显微镜（SEM）观察了ZrO2多孔陶瓷的相组成和显微结构,结果表明其具有孔径分布均匀的结构特点且ZrO2四方相结构没有改变.     

多孔陶瓷——绿色功能材料

本文概述了多孔陶瓷材料的制备方法，性能应用以及研究开发的前景。     

轻质多孔粉煤灰陶瓷的研制

为开拓粉煤灰应用新领域和提高利用废产品的附加值，利用粉煤灰研发新型的高附加值陶瓷产品越来越受到陶瓷界的关注和重视。研制表明，通过调整配料，用粉煤灰和发泡玻璃质空心球状粗粒（如珍珠岩）等作主要原料，适量配合其他原料和助剂，采用烧结工艺可生产孔隙率高的轻质多孔粉煤灰质陶瓷。     

多孔陶瓷过滤材料

介绍了多孔陶瓷和陶瓷分离膜的特点、分类、物理性能、工艺影响因素及过滤性能和应用情况。     

复合蓄热材料的研制与应用

以KAl(SO4)2·12H2O为相变材料,以多孔陶瓷为基体,采用熔融浸渍法制备了复合相变蓄热材料。此复合相变材料结合了潜热蓄热材料与显热蓄热材料的优点,并克服了无机盐相变材料相变过程无定型的缺点及陶瓷蓄热显热小的缺点。将自制的复合蓄热材料实际应用于咖啡壶加热设备中,实验结果表明加入复合蓄热材料后的咖啡壶每小时节能率达38.8%。     

Development of high temperature material for cellular ceramic regenerative storage heater

Ceramic Regenerative Storage Heater (RSH) is the preferable solution to provide clean hot air in Hypersonic Wind Tunnel (HWT) and Scramjet Test facilities to prevent the liquefaction of air during expansion in the high Mach number nozzles. Selection of the heater storage material for such operational requirements is a challenging task. As per the theoretical background; alumina, zirconia or mullite compositions have the capability to withstand at such high operating conditions. In the current study, a series of experiments were carried out to estimate the thermal characteristics of the material. This paper highlights the simplified approach by combining theoretical and experimental methods for economic (reduced time and cost) selection process of high temperature material. The desired material must possess good thermal shock resistance and low dust generation characteristics. Al₂O₃ and SiO₂ based matrix composition fused in a transcrystalline phase exhibits significant improvement on the overall material integrity. Several Al₂O₃ and SiO₂ matrix compositions were examined and the final matrix composite ratio of 90% of Al₂O₃ and 10% of SiO₂ is considered as the desired candidate material. The ceramic matrix was sintered at a temperature of 2123?K, under the specific pressure of 1400?kg/cm² for a period of 2?h, at a heating rate of 3.5?°C/min. The results of the thermal shock tests on various samples are presented. To improve the anti-dust characteristics, the final samples were coated with fine particles (5?µm) of Al₂O₃ and SiO₂ matrix. Based on the experimental evaluation, Al₂O₃ and SiO₂ fused matrix composition found to be meeting all the requirements of high temperature storage material.     

制备工艺对多孔碳化硅材料性能的影响

研究了骨料粒径、添加剂种类、质量分数对陶瓷管性能的影响。采用自制装置分别测定了孔径分布、平均孔径、孔隙率和气体通量。用SEM观察其表面形貌。结果表明,使用较细的碳化硅颗粒,气体通量减小,抗弯强度增加;随着造孔剂质量分数的变化,多孔碳化硅陶瓷管的性能也有明显的不同,最佳添加量为10%左右。增加烧结结合剂的加入量,气体通量和抗弯强度均下降。     

Hierarchical highly porous composite ceramic material modified by hydrophobic methyltrimetoxysilane-based aerogel

Journal of Porous Materials - A highly porous composite material consisting of silicon dioxide microfibers filled with nanoporous methyltrimethoxysilane-based aerogel was synthesized by a...     

基于Lattice-Boltzmann方法的纳米颗粒多孔介质导热特性

为研究气凝胶纳米颗粒的导热特性,提出了一种基于随机统计原理的构造气凝胶多孔介质介观尺度三维物理模型的方法。模型中颗粒空间分布、粒径分布及孔隙率可以根据实际气凝胶微尺度结构数据调整。基于所构造的物理模型,采用D3Q15LBM进行了数值模拟。分析了颗粒尺寸、孔隙率等因素对气凝胶导热性能的影响规律,即在既定孔隙率下,热导率随粒径增大而减小;既定粒径下,随孔隙率的递增热导率先下降后上升;颗粒尺寸不均匀性对热导率的影响甚大。模拟与实验结果相吻合。研究工作对优化气凝胶导热性能,提高其有效热导率的预测精度具有参考价值。     

Development of porous permeable ceramic material and filtering element technology for candle-shaped filter equipment

Areduction in manufacture expenditure for a production unit, and also preparation of metals and alloys in pure and ultra-pure form may be achieved using newly created filtering elements made of porous permeable ceramic materials with a pore size controlled from “micro” to “nano”. Methodology is presented for creating filtering elements made of porous permeable ceramic based on a concentrate of disthene-sillimanite for candle-shaped filtering elements. Translated from Novye Ogneupory, No. 1, pp. 23 – 27, January 2009.     

Development of a chitosan-based biofoam: application to the processing of a porous ceramic material

Developing biofoams constitutes a challenging issue for several applications. The present study focuses on the development of a chitosan-based biofoam. Solutions of chitosan in acetic acid were dried under vacuum to generate foams with high-order structures. Chitosan concentration influenced significantly the morphology of developed porosity and the organization of pores in the material. Physico-chemical characterizations were performed to investigate the effects of chitosan concentration on density and thermal conductivity of foams. Even if chitosan-based biofoams exhibit interesting insulating properties (typically around 0.06 W·m(-1)·K(-1)), it has been shown that their durabilities are limited when submitted to a wet media. So, a way of application consists to elaborate a ceramic material with open porosity from a slurry prepared with an organic solvent infiltrating the porous network of the foam.