Additive manufacturing of ceramics from preceramic polymers: A versatile stereolithographic approach assisted by thiol-ene click chemistry
Additive manufacturing of ceramics from preceramic polymers: A versatile stereolithographic approach assisted by thiol-ene click chemistry
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DOI：
10.1016/j.addma.2019.02.012
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发表时间：
2019-05-01
影响因子：
11
通讯作者：
Gurlo, Aleksander
中科院分区：
文献类型：
--
作者：
Wang, Xifan;Schmidt, Franziska;Gurlo, Aleksander
在这里，我们介绍了一种通用的立体光刻路线，生产三种不同的含硅热固性材料，热处理后产生高性能陶瓷。我们的方法是基于一个快速和廉价的硫醇-烯自由基加成，可以应用于不同类别的预陶瓷聚合物与碳-碳双键。由于硫醇-烯点击反应的快速性和效率，这种增材制造过程可以在台式打印机上使用传统光源有效地进行。通过光引发的交联，液体预陶瓷聚合物转变成稳定的不熔热固性材料，其在聚合物到陶瓷的转变期间保持其形状。热固材料经热解后转变为收缩均匀、密度高的玻璃陶瓷。所获得的陶瓷结构几乎完全致密，具有光滑的表面，并且没有宏观空隙和缺陷。与其它多孔陶瓷相比，所制造的SiOC蜂窝显示出显著更高的压缩强度与重量比。
Here we introduce a versatile stereolithographic route to produce three different kinds of Si-containing thermosets that yield high performance ceramics upon thermal treatment. Our approach is based on a fast and inexpensive thiol-ene free radical addition that can be applied for different classes of preceramic polymers with carbon-carbon double bonds. Due to the rapidity and efficiency of the thiol-ene click reactions, this additive manufacturing process can be effectively carried out using conventional light sources on benchtop printers. Through light initiated cross-linking, the liquid preceramic polymers transform into stable infusible thermosets that preserve their shape during the polymer-to-ceramic transformation. Through pyrolysis the thermosets transform into glassy ceramics with uniform shrinkage and high density. The obtained ceramic structures are nearly fully dense, have smooth surfaces, and are free from macroscopic voids and defects. A fabricated SiOC honeycomb was shown to exhibit a significantly higher compressive strength to weight ratio in comparison to other porous ceramics.