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Pore Structure Evolution During Solvent Extraction and Wicking

机译:溶剂萃取和芯吸过程中孔结构的演变

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摘要

Pore structure evolution and binder distribution during both solvent extraction and wicking were investigated for plastic-formed ceramic bodies. The solvent extraction rate had a t~(-1/2) dependence, while the wicking rate varied depending on the degree of saturation. There existed a debinding front separating the debinded region (with pendular state) from the undebinded region (with fluid state) during solvent extraction, while the green body went through sequential transitions of capillary structure as a whole during wicking with the help of the rapid re-distribution of the binder system. In fact, the debinding process by wicking could be divided into four regimes: (ⅰ) the rapidly falling rate regime up to capillary state, (ⅱ) a constant rate regime up to the funicular state, (ⅲ) the first slowly falling rate regime to the pendular state, and (ⅳ) the second slowly falling rate regime by evaporation and diffusion.
机译:研究了塑料成型陶瓷体在溶剂萃取和芯吸过程中的孔结构演变和粘合剂分布。溶剂萃取速率具有t〜(-1/2)依赖性,而芯吸速率根据饱和度而变化。在溶剂萃取过程中,存在一个脱脂前沿,将脱胶区域(摆动状态)与未脱胶区域(流体状态)分开,而生坯在芯吸过程中通过快速重新吸收而经历了整个毛细管结构的顺序转换-粘合剂系统的分布。实际上,通过芯吸作用进行的脱脂过程可以分为四个阶段:(ⅰ)直至毛细血管状态的快速下降速率;(ⅱ)直至缆索状的恒定速率;(ⅲ)第一个缓慢下降速率到悬垂状态,以及(ⅳ)通过蒸发和扩散产生的第二个缓慢下降速率。

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