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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of polymeric surfactant on flow behaviors of nickel-ethanol-isopropanol suspensions
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Effect of polymeric surfactant on flow behaviors of nickel-ethanol-isopropanol suspensions

机译：聚合物表面活性剂对镍-乙醇-异丙醇悬浮液流动行为的影响

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摘要

Influence of a non-ionic, polymeric surfactant to the rheology and suspension structure of nickel (Ni) powders dispersed in ethanol-isopropanol solvents has been examined over a range of volumetric solids loadings (PHI= 0.05-0.25), surfactant concentrations (0-5 wt. percent of the solids), and shear rates (gamma = 10~1 to 10~3 s~(-1)). The polymeric surfactant of propylene glycol facilitated the suspension flow, resulted in approx 60 percent reduction in viscosity (gamma = 10~2 s~(-1)). A shear-thinning flow behavior was generally observed in the shear regime investigated, while dilatancy or even shear thickening was found at high shear rates (typically at gamma > 600 s~(-1)). The shear-thinning flow revealed that the powdered suspensions were flocculated in structure. An estimate of the fractal dimension (D_f) of the suspension indicated that D_f = 2.2 and 2.1 for the Ni suspensions with and without the polymeric surfactant, respectively. The similar D_f values suggested that the suspensions structures were most likely of reaction-limited cluster aggregation (RLCA) model, to which, particle rearrangements were expected to occur as the suspensions were under shear stresses.
机译：在一定范围的体积固体负载量（PHI = 0.05-0.25），表面活性剂浓度（0-0）的范围内，已经研究了非离子聚合物表面活性剂对分散在乙醇-异丙醇溶剂中的镍（Ni）粉的流变和悬浮结构的影响。 5重量％的固体）和剪切速率（伽玛= 10〜1至10〜3 s〜（-1））。丙二醇的聚合物表面活性剂促进了悬浮液的流动，导致粘度降低了约60％（γ= 10〜2 s〜（-1））。在所研究的剪切状态下，通常观察到剪切稀化的流动行为，而在高剪切速率下（通常在γ> 600 s〜（-1）时）则出现了剪胀性甚至剪切增厚。剪切稀化流表明，粉状悬浮液在结构上絮凝。对悬浮液的分形维数（D_f）的估计表明，对于具有和不具有聚合物表面活性剂的Ni悬浮液，D_f分别为2.2和2.1。相似的D_f值表明，悬浮液的结构最有可能是反应受限的团簇聚集（RLCA）模型，由于悬浮液处于剪切应力下，预计该颗粒会发生颗粒重排。

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