Rheology and Pressure Filtration of Aqueous SiC Suspensions of Nanometer-sized Bimodal Particles
Rheology and Pressure Filtration of Aqueous SiC Suspensions of Nanometer-sized Bimodal Particles
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纳米双峰颗粒 SiC 水悬浮液的流变学和压力过滤
DOI：
10.1016/j.ceramint.2010.02.020
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发表时间：
2010
影响因子：
5.2
通讯作者：
Soichiro Sameshima
中科院分区：
文献类型：
--
作者：
Naoki.Matsunaga;Yuki Nakashima;Yoshihiro Hirata;Soichiro Sameshima
采用自行研制的加压过滤装置，在恒定十字头活塞速度下，研究了混合SiC颗粒（直径为30和800nm）在pH值为7时的固结行为。在800 nm SiC中加入30 nm SiC，随着SiC加入量的增加，胶体悬浮液的流变性由牛顿流变为假塑性流。当外加压力超过临界压力（ΔPtc）时，发生了从分散良好的悬浮液到絮凝悬浮液的相变。随着30nm SiC含量的增加，Δ Ptc值减小。基于各粉末的偏摩尔体积分析双峰SiC颗粒的堆积密度。在混合粉末压块中，较大的颗粒比较小的颗粒更致密地堆积。
The consolidation behavior of mixed SiC particles (30 and 800nm diameters) at pH 7 was examined using a developed pressure filtration apparatus at a constant crosshead speed of a piston. The addition of 30nm SiC to 800nm SiC changed the rheological properties of colloidal suspension from Newtonian to pseudoplastic flow through Bingham flow with increasing amount of 30nm SiC. A phase transition from a well dispersed suspension to a flocculated suspension occurred when the applied pressure exceeded a critical pressure (ΔPtc). The ΔPtcvalue decreased with increasing amount of 30nm SiC. The packing density of bimodal SiC particles was analyzed based on the partial molar volume of each powder. The larger particles were more densely packed than the smaller particles in the mixed powder compact.