State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, P. R. China.
Center for Bio-Integrated Electronics, Northwestern University, Evanston, IL, 60208, USA.
Adv Mater. 2019 Mar;31(11):e1807326. doi: 10.1002/adma.201807326. Epub 2019 Jan 18.
Shaping ceramics into complex 3D geometries is desirable yet challenging, particularly those with structural hierarchy spanning different length scales. A mechano-plastic pyrolysis process that overcomes this limitation is reported. In addition to taking advantage of the moldability of organic polymers, the process uniquely incorporates mechano-plasticity via dynamic covalent bond exchange for reconfiguring the shape of a preceramic polymer. The combined steps result in simultaneous shape control at both micro- and macro-scales. Further pyrolysis leads to complex ceramic structures that are otherwise difficult to produce. To enable this process, rational design of the polymer network is required to satisfy an unusual combination of mechano-plasticity and pyrolysis. Overall, the process offers an avenue for efficient fabrication of hierarchical 3D ceramic structures suitable for engineering applications.
将陶瓷塑造成复杂的 3D 几何形状是理想的，但具有挑战性，特别是那些具有跨越不同长度尺度的结构层次的形状。本文报道了一种克服这一限制的机械塑性热解工艺。除了利用有机聚合物的可模塑性外，该工艺还通过动态共价键交换独特地引入机械塑性，以重新配置预陶瓷聚合物的形状。这些组合步骤导致在微观和宏观尺度上同时进行形状控制。进一步的热解导致复杂的陶瓷结构，否则难以生产。为了实现这一过程，需要对聚合物网络进行合理设计，以满足机械塑性和热解的不寻常组合。总的来说，该工艺为高效制造适用于工程应用的分级 3D 陶瓷结构提供了一条途径。
