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首页> 美国卫生研究院文献>Materials >Study on Rheological Behavior of Micro/Nano-Silicon Carbide Particles in Ethanol by Selecting Efficient Dispersants
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Study on Rheological Behavior of Micro/Nano-Silicon Carbide Particles in Ethanol by Selecting Efficient Dispersants

机译：通过选择高效分散剂研究乙醇中微/纳米碳化硅颗粒的流变行为

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A colloidal stability study of a nonaqueous silicon carbide suspension is of great significance for preparing special silicon carbide ceramics by colloidal processing. In this paper, three different chemical dispersants, which are amphiphilic, acidophilic, and alkaliphilic, are selected to compare their ability to stabilize nonaqueous slurries of silicon carbide. The analysis of the flow index factor is first used to estimate the colloidal stability of the suspensions. The results show that the addition of only 5 wt.% polyvinylpyrrolidone (PVP) forms a silicon carbide slurry with a low viscosity value of 17 mPa⋅s at 25 s . In addition, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS)measurements indicate that the PVP molecule is successfully adsorbed on the surface of silicon carbide. The different adsorption models are fitted, and the adsorption of PVP molecules on the surface of silicon carbide belongs to the Langmuir single-layer adsorption model. At the optimal PVP amount, the volume content of the suspension is as high as 22.27 vol.%, a Newtonian-like fluid still appears, and no agglomerate structure is formed in the system. After the volume content exceeds 22.27 vol.%, the flow index factor of the slurry begins to plummet, indicating that the slurry begins to transform from a Newtonian-like fluid to a shear-thinning fluid. The particles undergo inevitable agglomeration accompanied by the emergence of yield stress. Finally, a maximum solid loading of the system is predicted to be 46 vol.%, using the Krieger-Dougherty model.
机译：非水碳化硅悬浮液的胶体稳定性研究对于通过胶体加工制备特殊的碳化硅陶瓷具有重要意义。在本文中，选择了两种不同的化学分散剂，分别是两亲性，嗜酸性和碱性，以比较它们稳定碳化硅非水浆料的能力。流动指数因子的分析首先用于估计悬浮液的胶体稳定性。结果表明，仅添加5重量％的聚乙烯吡咯烷酮（PVP）形成碳化硅浆料，其在25s时的粘度值为17mPa·s。此外，傅立叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）测量表明PVP分子已成功吸附在碳化硅表面。拟合了不同的吸附模型，PVP分子在碳化硅表面的吸附属于Langmuir单层吸附模型。在最佳PVP量下，悬浮液的体积含量高达22.27vol。％，仍出现牛顿样流体，并且在系统中不形成附聚物结构。在体积含量超过22.27vol。％之后，浆料的流动指数因子开始下降，这表明浆料开始从类牛顿流体转变为剪切稀化流体。颗粒不可避免地发生团聚，并伴随屈服应力的出现。最后，使用Krieger-Dougherty模型，系统的最大固体负载预计为46 vol。％。

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