通过添加剂和模板控制冷冻铸造陶瓷的结构
Architectural control of freeze-cast ceramics through additives and templating
摘要：
浓缩胶体悬浮液的冷冻是一个涉及大量参数的复杂物理过程。这些参数提供了独特的工具，在一个单一的处理步骤中以多个长度尺度操纵冷冻铸造材料的结构。然而，我们仍然远远没有发展预测模型来描述冰晶在浓缩颗粒浆料中的生长。为了对冷冻铸造材料的微观结构形成施加可靠的控制，有必要更深入地理解实验条件与生长固体的微观结构之间的基本关系。在这项工作中，我们探讨了几个处理变量的作用（例如，悬浮液的组成、冷冻速率和冷冻表面的图案化），其可能影响用于冷冻浇铸材料的建筑操作的配制策略。我们还演示了，使用冷冻铸造层状结构，如何减少不到一半的层状厚度增加抗压强度超过一个数量级。
英文摘要：
The freezing of concentrated colloidal suspensions is a complex physical process involving a large number of parameters. These parameters provide unique tools to manipulate the architecture of freeze-cast materials at multiple length scales in a single processing step. However, we are still far from developing predictive models to describe the growth of ice crystals in concentrated particle slurries. In order to exert reliable control over the microstructural formation of freeze-cast materials, it is necessary to reach a deeper understanding of the basic relationships between the experimental conditions and the microstructure of the growing solid. In this work, we explore the role of several processing variables (e.g., composition of the suspension, freezing rate, and patterning of the freezing surface) that could affect the formulation strategies for the architectural manipulation of freeze-cast materials. We also demonstrate, using freeze-cast lamellar structures, how reducing the lamellar thickness by less than half increases compressive strength by more than one order of magnitude.
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