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Particle Size Distribution,Powder Agglomerates and Their Effects on Sinterability of Ultrafine Alumina Powders 被引量:2
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作者 Renjie ZENG (Dept. of Materials Science, University of Xiamen, Xiamen 361005, China) b.rand (Dept.of Materials, University of Leeds, Leeds LS2 9JT, England) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2000年第4期393-396,共4页
An intensive study of the particle size distribution of four commercial ultrafine alumina powders to obtain information about the powder agglomeration and relate them to the compactibility and the sinterability has be... An intensive study of the particle size distribution of four commercial ultrafine alumina powders to obtain information about the powder agglomeration and relate them to the compactibility and the sinterability has been made. 展开更多
关键词 rate Particle Size Distribution Powder Agglomerates and Their Effects on Sinterability of Ultrafine Alumina Powders AKP than
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pH Value Effects in Shear Rheology of Concentrated Alumina Suspensions 被引量:1
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作者 曾人杰 魏光 b.rand 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2000年第2期180-183,共4页
The influence of pH on the rheological properties of concentrated alumina suspensions was investigated. At various pH values, the alumina exhibited pseudoplastic, near Bingham flow behaviors. The fully-deflocculated s... The influence of pH on the rheological properties of concentrated alumina suspensions was investigated. At various pH values, the alumina exhibited pseudoplastic, near Bingham flow behaviors. The fully-deflocculated suspensions exhibited Newtonian flow behaviors, while the fully-flocculated suspensions demonstrated very high viscosity and shear yield stress. 展开更多
关键词 shear rate shear stress extrapolated shear yield stress plastic viscosity pH value
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Improvement of True Green Porosity, Sinterability and Microstructure in Alumina Ceramics by Filter Pressing 被引量:1
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作者 RenjieZENG b.rand 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第1期105-108,共4页
Comparison between filter pressing and isostatic pressing for submicrometer alumina powder has been systematically made. Obvious improvements in true porosity, sintering behaviour, and microstructure of green compacts... Comparison between filter pressing and isostatic pressing for submicrometer alumina powder has been systematically made. Obvious improvements in true porosity, sintering behaviour, and microstructure of green compacts without cracking and in agglomeration of final ceramics have been achieved. 展开更多
关键词 POROSIMETRY AGGLOMERATE Sintering dilatometry pH PEG
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Effects of Dispex A40 on Rheology and Filter Pressing Behaviours of Concentrated Alumina Suspensions
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作者 Renjie ZENGt Dept. of Materials Science & Engineering, University of Xiamen, Xiamen 361005, China b.rand Dept. of Process, Environment & Materials Engineering, University of Leeds, Leeds LS2 9JT, UK 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第6期664-666,共3页
Variation of plastic viscosity and extrapolated shear yield stress with the concentration of Dispex A40 for the concentrated Alcoa A16 alpha -Al2O3 suspensions at 0.27 powder volume fraction was investigated at 294 K.... Variation of plastic viscosity and extrapolated shear yield stress with the concentration of Dispex A40 for the concentrated Alcoa A16 alpha -Al2O3 suspensions at 0.27 powder volume fraction was investigated at 294 K. An optimum level of Dispex A40 for full deflocculation is found to be at 0.18% mass fraction of the powder, at which the rheological behaviour shows little different to that of adjusting the pH to 4 to obtain full deflocculation. It is demonstrated that the shear stress drop can roughly work as an index for the thixotropy in particular fixed conditions, and consequently an index for the deflocculation as the shear stress drop becomes larger when the level of the flocculation increases, and vice versa. It is also found that the addition of Dispex A40 can prevent the filter cakes from cracking, whereas the cakes at various pH values with polyvinyl alcohol as a sole polymer normally develop cracking during drying. 展开更多
关键词 rate Effects of Dispex A40 on Rheology and Filter Pressing Behaviours of Concentrated Alumina Suspensions
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Effects of PVA and PEG on pH Dependent Shear Yield Stress of Concentrated Alumina Suspensions
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作者 曾人杰 b.rand 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第1期132-133,共2页
The pH dependence of the extrapolated shear yield stress for Alcoa A16 a-Al2O3 suspensions at the powder volume fraction of 0.27 with and without addition of both polyvinyl alcohol (PVA) and polyethylene glycol (PEG) ... The pH dependence of the extrapolated shear yield stress for Alcoa A16 a-Al2O3 suspensions at the powder volume fraction of 0.27 with and without addition of both polyvinyl alcohol (PVA) and polyethylene glycol (PEG) each at fixed 0.18% of the powder mass was studied. With the polymer added, the full deflocculation of the suspension shifts from about pH=4 to around pH=1.5, at which the minimum value of shear yield stress is higher than that at pH=4. The addition of both PVA and PEG was found to prevent the filter cake from cracking. 展开更多
关键词 polyvinyl alcohol polyethylene glycol shearing yield stress pH value alumina suspension
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