Key Laboratory of Jiangxi Universities for Inorganic Membranes

Jingdezhen, China

Key Laboratory of Jiangxi Universities for Inorganic Membranes

Jingdezhen, China
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Dong Y.,University of Limerick | Hampshire S.,University of Limerick | Zhou J.-E.,Key Laboratory of Jiangxi Universities for Inorganic Membranes | Lin B.,Hefei University of Technology | And 3 more authors.
Journal of Hazardous Materials | Year: 2010

In order to effectively utilize industrial waste fly ash, porous mullite ceramic membrane supports were prepared from fly ash and calcined bauxite with chemically pure titania as sintering additive. The effects of TiO2 on the sintering behaviors and main properties of porous mullite were studied in detail. Due to the addition of titania, the sintering of the flyash-based mullite was inhibited at low temperatures, but effectively improved at high temperatures, the latter is suitable for preparing porous mullite membrane supports by incomplete sintering. Titania entered into liquid glassy phase with low high-temperature viscosity during sintering, resulting in the improvement of sintering activity, as well as the lowering of secondary mullitization temperature (where 2.0% titania). Between 1300 and 1500°C, with increasing titania content, the samples exhibit increased trends in both linear shrinkage percent and bulk density, but a slightly decreased trend in open porosity, at all sintering temperatures. At 1300-1500°C, the samples sintered at 1450°C for 2h exhibit the lowest shrinkage and bulk density, as well as the highest open porosities in the investigated titania content range of 0-6.0wt.%. Also, with increasing titania content, the pore size decreases slightly but the three-point flexural strength increases gradually at 1450°C. © 2010 Elsevier B.V.


Dong Y.,University of Limerick | Dong Y.,University of Science and Technology of China | Dong Y.,Key Laboratory of Jiangxi Universities for Inorganic Membranes | Lin B.,University of Science and Technology of China | And 7 more authors.
Materials Characterization | Year: 2011

Tubular porous alumina ceramic membrane supports were fabricated by an extrusion-drying-sintering process and then characterized in detail in terms of corrosion resistance in both H2SO4 and NaOH aqueous solutions. Variations in the properties of the alumina supports such as mass loss percent, mechanical strength, open porosity and pore size distribution were studied before and after corrosion under different conditions. In addition, the microstructures were analyzed using scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction before and after corrosion. The fabricated porous alumina supports offer possibilities for some potential applications as micro-filtration or ultra-filtration membrane supports, as well as in the pre-treatment of strongly acidic industrial waste-liquids. © 2011 Elsevier Inc. All rights reserved.


Dong Y.,University of Limerick | Dong Y.,Key Laboratory of Jiangxi Universities for Inorganic Membranes | Dong Y.,University of Science and Technology of China | Hampshire S.,University of Limerick | And 2 more authors.
International Journal of Hydrogen Energy | Year: 2011

Nano-sized Ce0.8Gd0.2O2-δ and Ce0.79Gd0.2Cu0.01O2-δ electrolyte powders were synthesized by the polyvinyl alcohol assisted combustion method, and then characterized by powder characteristics, sintering behaviors and electrical properties. The results demonstrate that the as-synthesized Ce0.8Gd0.2O2-δ and Ce 0.79Gd0.2Cu0.01O2-δ possessed similar powder characteristics, including cubic fluorite crystalline structure, porous foamy morphology and agglomerated secondary particles composed of gas cavities and primary nano crystals. Nevertheless, after ball-milling these two powders exhibited quite different sintering abilities. A significant reduction of about 400 °C in densification temperature of Ce0.79Gd 0.2Cu0.01O2-δ was obtained when compared with Ce0.8Gd0.2O2-δ. The Ce 0.79Gd0.2Cu0.01O2-δ pellets sintered at 1000 °C and the Ce0.8Gd0.2O 2-δ sintered at 1400 °C exhibited relative densities of 96.33% and 95.7%, respectively. The sintering of Ce0.79Gd 0.2Cu0.01O2-δ was dominated by the liquid phase process, followed by the evaporation-condensation process, Moreover, Ce0.79Gd0.2Cu0.01O2-δ shows much higher conductivity of 0.026 S cm-1 than Ce0.8Gd 0.2O2-δ (0.0065 S cm-1) at a testing temperature of 600 °C. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Zhou J.-E.,Key Laboratory of Jiangxi Universities for Inorganic Membranes | Dong Y.,Key Laboratory of Jiangxi Universities for Inorganic Membranes | Dong Y.,University of Science and Technology of China | Dong Y.,University of Limerick | And 2 more authors.
Applied Clay Science | Year: 2011

Porous cordierite ceramics were prepared using sepiolite source of MgO and SiO2 and alumina as starting materials by simple dry-pressing/sintering. The sepiolite/alumina green bodies were sintered at 1100-1350°C for 2h. The characterization was focused on thermal analysis, phase evolution, sintering behavior, thermal expansion and micro-structural changes using DSC/TG, XRD, dilatometry and SEM. α-Cordierite was formed above 1200°C, the amount of which increased steadily with the sintering temperature. Increasing sintering temperature also improved the densification (especially above1000°C), and decreased the thermal expansion (especially above 1200°C). Porous cordierite with a bimodal pore size distribution (1.4-1.9μm and 10μm) was prepared with cornstarch as pore-former. © 2011 Elsevier B.V.


Dong Y.,University of Limerick | Dong Y.,Key Laboratory of Jiangxi Universities for Inorganic Membranes | Dong Y.,University of Science and Technology of China | Hampshire S.,University of Limerick | And 4 more authors.
Journal of the European Ceramic Society | Year: 2011

Mullite ceramics were fabricated at relatively low sintering temperatures (1500-1550°C) from recycled flyash and bauxite with MgO addition as raw materials. The densification behavior was investigated as function of magnesia content and sintering temperature. The results of thermal analysis, bulk density and pore structure indicate that MgO addition effectively promoted sintering, especially above 1450°C. Due to the presence of large interlocked elongated mullite crystals above 1450°C, associated with enhanced densification, an improvement in mechanical strength was obtained for the samples containing magnesia. The addition of magnesia slightly decreases the LTEC at 1300°C due to the formation of low-expansion α-cordierite, but slightly increases the LTEC above 1400°C due to the formation of high expansion corundum and MgAl2O4 spinel. © 2010 Elsevier Ltd.

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