Papers by Author: Liang Cheng

Abstract: Aqueous tape casting was developed to fabricate YSZ films using a cobinder. The processing parameters such as pH value, dispersant content, and binder type and content on the quality of YSZ films were investigated and optimized. The results show that at pH = ~ 9.6, the YSZ suspensions with 0.8wt% of the dispersant PAA have a good stability. The degree of pseudo-plastic and viscosity of slurry using different binders increased with the increasing of PVA content, in contrast, the degree of pseudo-plastic and viscosity decreased with the increasing of B1070 content. The density and drying shrinkage of YSZ green tape are tightly related to the different binders. The sintered density of YSZ film increased as the density of green tape increased. The green tape using PVA (30wt %) +B1070 (70wt %) cobinders was sintered at 1400 °C for 2 hours. The films of YSZ with 98.5% of theoretical density have been obtained.

Abstract: Flower-like NiO powders with nano-architectures, self-assembled nano-sheets, were synthesized using Ni (NO3)2•4H2O and urea in mix solvents of ethanol and water by homogeneous precipitation. XRD patterns showed that the NiO powders were of hexagonal structure. FESEM and TEM confirmed that the average diameter of the flower-like NiO was 10μm, and the ultra-thin nano-sheets had micro-porous structure, with the thickness less than 100nm and the size of 2μm×3μm. Specific surface area (BET) was around 130.92m2/g.

Abstract: In this paper, the sintering behavior of Ni/YSZ anode and YSZ electrolytes fabricated by aqueous tape casting were studied. This study involved tape casing of Ni/YSZ (8 mol% Y2O3 stabilized ZrO2) anode, and co-sintering of anode supports and electrolytes. At last, thickness of 140 mm (after sintering) with uniform microstructure and ~30% porosity anode and thickness of ~10 0m (after sintering) with high density (> 95%) and electrolyte were achieved.