利用钢渣研制多孔陶瓷滤球

本文利用炼钢厂钢渣，添加少量的天然矿物原料制备了气孔率58.21%、平均压碎强度18.94MPa的多孔陶瓷滤球.采用现代测试技术XRD、SEM对多孔陶瓷样品进行了相组成分析及显微结构观察.同时分析了用钢渣制作陶瓷滤球的可行性，展望了它的应用前景。     

Preparation of Porous Al2O3-Ceramics by Biotemplating of Wood

A new approach for preparing of microcellular ceramic materials is the reproduction of wood morphologies by biotemplating, where the structural features of the native wood are maintained in the ceramic product. Biomorphic Al₂O₃-ceramics were manufactured via the sol-gel route by repeated infiltration of low viscous alumina sols into wood preforms and subsequently sintered in air at 1550°C. The microstructure and phase formation during processing were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), density and porosimetry measurements. In contrast to conventional processed, highly-porous Al₂O₃-ceramics, the microstructure of the biomorphic Al₂O₃-ceramics is characterized by an uniaxial pore morphology with pore diameters in the micrometer range, depending on the initially used wood template.     

多孔β-TCP陶瓷药物载体结构与性能的影响因素

本分析了影响多孔β-TCP陶瓷药物载体结构与性能的因素，确定了制备多孔β-TCP陶瓷药物载体的技术路线和工艺参数。     

莫来石纤维多孔陶瓷负载性能研究

用酸性偏磷酸盐作粘结剂、加压排液法成型制备了孔隙率高达96％的莫来石纤维多孔陶瓷，采用真空浸渍法，对其负载稀土复合金属氧化物La0.8Sr0.2CoO3的性能进行了研究，考察了浸渍时间、浸渍次数对负载量的影响，得出最佳浸渍时间为60min，浸渍次数为2次。通过扫描电镜(SEM)表征了内部架构，最后指出莫来石纤维多孔陶瓷有望成为具有较好效果的新型催化剂载体。     

Relationship of threshold diameter and Darcean permeability in unconsolidated porous structures

Experiment was conducted on the threshold pressure for atmospheric air through unconsolidated narrow size distributed mini sphere and sand particles at low flow rates. The threshold diameter calculated from measured threshold pressure showed that it does not follow the traditional similarity theory. This is consistent with our experiment on accurate permeability measurement, and can be explained as a result of gas slip flow within such micro pore structure. Our current work tend to find the method to predict the permeability-threshold pressure relationship for unconsolidated porous structures.     

莫来石纤维多孔陶瓷的制备与性能

对纤维多孔陶瓷的制备及性能进行了研究。在制备纤维多孔陶瓷时,采用酸性磷酸铝A23(P/Al原子比为2 3)作粘结剂,所制备的多孔陶瓷在各方面都具有优良的性能。如导热系数λ(22℃)为0.0529W/m.℃、热膨胀系数α为4.75×10-6/℃、孔隙率为96.22%、容重为0.1142 g/cm3等。在环保、节能领域具有广泛的应用前景和重要的社会及经济意义。     

多孔介质内部热质传递的等效耦合扩散模型的推导及其应用

基于Whitaker的体积平均方程，在不附加任何新的假设的基础上，对多孔介质内部热质传递的等效耦合扩散模型进行推导，得出了多孔介质内部热质传递的等效耦合扩散模型。并应用该模型对瓷质砖体干燥过程进行了数值模拟，模拟结果与实验结果十分吻合。     

Porous TiC Ceramics Derived from Wood Template

A porous TiC ceramic with a woodlike structure was prepared from wood template through tetrabutyl titanate vacuum-infiltration. The tetrabutyl titanate was first decomposed to TiO₂, and then in-situ reaction between TiO₂ and carbon template took place in the cellular wall at high sintering temperature. The original structure of wood was retained. In addition, the dimensional shrinkage of the pores after the removal of the residual carbon was different according to the difference of the wood density.     

两亲性聚合物多孔微球的制备研究

合成了具有悬挂双键的苯乙烯-二乙烯基苯多孔微球,在悬挂双键处接枝甲基丙烯酸甲酯,制成了一系列不同接枝度的两亲性聚合物多孔微球。考察了悬挂双键数量、反应时间等因素对接枝率的影响以及接枝率对微球形貌的影响。实验中通过观测澄清点,有效地控制了反应后期自加速现象对接枝率的影响。在反应时间25 m in时,制得了平均孔径为50 nm的两亲性多孔微球。将该微球用于对化妆品活性组分的负载,对极性物的负载率比接枝前高出2倍。     

Numerical study of the transfer of shock-wave loading to a screened flat wall through a layer of a powdered medium and a subsequent air gap

The two-velocity, two-temperature model with two stresses in a mixture of a gas and solid particles contacting each other is used to numerically study the dynamic effect of an air shock wave incoming onto a solid wall with a screening layer of a porous powdered medium at some distance from the wall. The process is described for the case of one-dimensional planar motion of the gaseous and disperse phases under the assumption of a viscoelastic behavior of the powder skeleton. The effect of stepwise shock waves onto the porous powdered screen is considered. The influence of parameters of the screening layer and the air gap on the dynamics of loading of the screened solid wall is analyzed. __________ Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 1, pp. 132–142, January–February, 2007.