AC electric field-induced changes in viscosity of aqueous ceramic suspensions and tuning of freeze-cast microstructure and compressive strength

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materialia Pub Date : 2024-09-12 DOI:10.1016/j.mtla.2024.102232
Dipankar Ghosh, Sashanka Akurati, James E. John, Raina Hempley, Sivakumar Chithamallu
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Abstract

A systematic parametric study was conducted on alternating current (AC) electric field-assisted freeze-casting to enable a comprehensive understanding of tuning freeze-cast microstructure and compressive strength and provide insights into the role of AC field. A novel finding was that the AC field increased the viscosity of aqueous ceramic suspensions, where the viscosity increase was dependent on the ceramic loading of suspensions, dispersant concentration, and field duration. Viscosity increased with field duration for a fixed solid loading and dispersant concentration. It was suggested that AC field-induced dielectrophoretic (DEP) forces decreased interparticle distances and increased interparticle interactions in ceramic suspensions, hence viscosity. It was revealed that the increase in viscosity of ceramic suspensions due to the AC field could be reversed. It was demonstrated that simple magnetic stirring of the suspensions previously subjected to an AC field (which increased viscosity) reduced viscosity to the level of the as-prepared suspensions. For materials fabrication, an AC electric field was applied to aqueous ceramic suspensions for the desired duration, then turned OFF, followed by freeze-casting, which remarkably influenced freeze-cast sintered microstructure. The impact of the field on microstructure increased with solid loading, dispersant concentration, and field duration, and microstructure changes were associated with viscosity of suspensions prior to freeze-casting. With increasing viscosity, freeze-cast microstructure became increasingly dendritic, i.e., bridge density increased. A positive correlation was observed between bridge density and compressive strength for all the materials. Depending on the solid loading, dispersant concentration, and field duration, about 5- to 8-fold increase in strength was achieved.

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交流电场诱导的水性陶瓷悬浮液粘度变化及冻铸微观结构和抗压强度的调整
对交流(AC)电场辅助冷冻铸造进行了系统的参数研究,以全面了解调整冷冻铸造的微观结构和抗压强度,并深入了解交流电场的作用。一项新发现是交流电场增加了水性陶瓷悬浮液的粘度,而粘度的增加与悬浮液中的陶瓷负载、分散剂浓度和电场持续时间有关。在固定的固体装载量和分散剂浓度下,粘度随电场持续时间的延长而增加。这表明交流电场诱导的介电泳(DEP)力减小了陶瓷悬浮液中颗粒间的距离,增加了颗粒间的相互作用,从而增加了粘度。研究发现,交流磁场导致的陶瓷悬浮液粘度增加可以逆转。实验证明,对之前受到交流电场影响(增加了粘度)的悬浮液进行简单的磁力搅拌,就能将粘度降低到制备悬浮液时的水平。在材料制造方面,将交流电场施加到水性陶瓷悬浮液中,持续所需的时间,然后关闭,接着进行冷冻铸造,这对冷冻铸造烧结的微观结构产生了显著影响。电场对微观结构的影响随固体装载量、分散剂浓度和电场持续时间的增加而增加,微观结构的变化与冻铸前悬浮液的粘度有关。随着粘度的增加,冷冻铸造的微观结构变得越来越树枝状,即桥密度增加。所有材料的桥密度和抗压强度之间都呈正相关。根据固体负载、分散剂浓度和现场持续时间的不同,强度可提高约 5 到 8 倍。
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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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