Ceramic Capillary Suspensions: Novel Processing Route for Macroporous Ceramic Materials
Ceramic Capillary Suspensions: Novel Processing Route for Macroporous Ceramic Materials
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DOI：
10.1111/jace.12126
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发表时间：
2013-02-01
影响因子：
3.9
通讯作者：
Willenbacher, Norbert
中科院分区：
文献类型：
--
作者：
Dittmann, Jens;Koos, Erin;Willenbacher, Norbert
介绍了一种利用毛细管悬浮液制备大孔陶瓷的新方法。在低浓度（约20vol%）的悬浮液中加入少量（约1vol%）的不混相，可使屈服应力提高几个数量级。这种流动行为的剧烈变化是由毛细管力控制的悬浮液中产生的跨越样品的粒子网络引起的。这个强大的网络可能会持续存在，即使主要的批量阶段被移除。因此，毛细管悬浮液可以用作制造多孔材料的前驱体。在这里，我们将重点介绍这种通用的、低成本的多孔陶瓷加工路线的具体特点。用Al2O3模型系统演示了如何调节孔隙率和孔径。使用该系统，我们能够实现大于60%的开孔率，平均孔径小于10m。
We introduce a novel method to produce macroporous ceramics by capillary suspensions. Adding a small amount (similar to 1vol%) of an immiscible secondary phase to a low concentration (similar to 20vol%) suspension can increase the yield stress by several orders of magnitude. This drastic change in flow behavior is induced by the creation of a sample-spanning particle network in the suspension controlled by capillary forces. This strong network may persist even if the primary bulk phase is removed. Accordingly, capillary suspensions can be used as a precursor for manufacturing porous materials. Here, we focus on the specific features of this universal, low-cost processing route for porous ceramics. An Al2O3 model system is used to demonstrate how to adjust porosity and pore size. With this system, we were able to achieve open porosities higher than 60% with an average pore size below 10m.