Shear thinning and shear thickening of concentrated ceramic suspensions
Shear thinning and shear thickening of concentrated ceramic suspensions
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DOI：
10.1016/s0927-7757(97)00133-7
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发表时间：
1998-02-15
影响因子：
5.2
通讯作者：
Bergstrom, L
中科院分区：
文献类型：
--
作者：
Bergstrom, L
研究了两种重要的陶瓷体系Si3N4粉末和SIC晶须与Al2O3颗粒复合体系的稳态剪切性能。浓缩的、胶体稳定的非水粉末悬浮液都表现出剪切变薄的行为，在高剪切速率下接近平台，这可以用Cross方程的高剪切形式来模拟。浓水SiCw和复合悬浮液在某些临界剪切速率下表现出强烈的剪切增厚，有时是不连续的，这可能是由于水动力聚类。可以将胶体稳定陶瓷悬浮液的体积分数依赖关系拟合到改进的kriger - dougherty模型中，该模型产生了最大体积分数Phi(m)的值。Phi(m)的巨大差异可能与晶须和粉末之间形状的差异有关。(C) 1998爱思唯尔科学有限公司
The steady shear properties of two important ceramic systems, Si3N4 powder, and the composite system SIC whiskers and Al2O3 particles, have been investigated. The concentrated, colloidally stable non-aqueous powder suspensions all displayed a shear thinning behaviour with an approach to a plateau at high shear rates which could be modelled by the high shear form of the Cross equation. The concentrated aqueous SiCw and composite suspensions showed a strong, sometimes discontinuous, shear thickening at some critical shear rate which was attributed to a possible hydrodynamic clustering. It was possible to fit the volume fraction dependence of the colloidally stable ceramic suspensions to a modified Krieger-Dougherty model which yields values of the maximum volume fraction Phi(m). Large differences in Phi(m) could be correlated to the differences in shape between the whiskers and powders. (C) 1998 Elsevier Science B.V.