冰模板多孔氧化铝结构
Ice-templated porous alumina structures
摘要：
规则图案的形成是涉及铸造材料的许多凝固过程的共同特征。我们在这里描述如何通过控制陶瓷浆料的冷冻，然后通过随后的冰升华和烧结，导致具有均匀和明确的架构的多层多孔氧化铝结构，可以在多孔氧化铝中获得规则图案。讨论了定向凝固过程中惰性粒子与凝固前沿的相互作用、冰的物理性质和实验结果之间的关系。冰的各向异性界面动力学导致了结构中许多特定的形态特征。这里获得的结构可以有许多应用，包括陶瓷过滤器，生物材料，并可以是致密的多层复合材料的基础上渗透后与选定的第二相。
英文摘要：
The formation of regular patterns is a common feature of many solidification processes involving cast materials. We describe here how regular patterns can be obtained in porous alumina by controlling the freezing of ceramic slurries followed by subsequent ice sublimation and sintering, leading to multilayered porous alumina structures with homogeneous and well-defined architecture. We discuss the relationships between the experimental results, the physics of ice and the interaction between inert particles and the solidification front during directional freezing. The anisotropic interface kinetics of ice leads to numerous specific morphologies features in the structure. The structures obtained here could have numerous applications including ceramic filters, biomaterials, and could be the basis for dense multilayered composites after infiltration with a selected second phase.
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