3D printing of open-porous cellular ceramics with high specific strength
3D printing of open-porous cellular ceramics with high specific strength
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DOI：
10.1016/j.jeurceramsoc.2017.06.001
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发表时间：
2017-12-01
影响因子：
5.7
通讯作者：
Willenbacher, Norbert
中科院分区：
文献类型：
--
作者：
Maurath, Johannes;Willenbacher, Norbert
我们提出了一种新的工艺路线，通过直接墨水书写制造高度开放的多孔，分层结构的陶瓷。我们制造了总孔隙率高达88%的细胞样品，其使用基于毛细管悬浮液的墨水显示出孔隙率在45%和60%之间且孔径X-503 < 6 μ m的完全开孔的支柱。创新的加工策略使得能够制造无裂纹、无变形的蜂窝陶瓷样品。我们打印的六边形蜂窝结构在压缩载荷下显示出极高的比强度，并显著扩大了迄今为止烧结毛细管悬浮体所覆盖的强度-密度范围。在不损失机械强度的情况下，陶瓷部件的密度降低了约2-3倍。面内和面外加载的六边形蜂窝结构的强度根据蜂窝结构的常见标度律而变化。蜂窝体的机械效率比散装样品从毛细管悬浮液，因为它们显示出明显较低的灵敏度强度对密度。(C)2017爱思唯尔有限公司版权所有
We present a novel processing route for manufacturing highly open porous, hierarchically structured ceramics via direct ink writing. We manufactured cellular samples with overall porosities up to 88% that exhibit fully open-porous struts with porosities between 45 and 60% and pore sizes X-503 < 6 mu m using capillary suspension based inks. An innovative processing strategy enabled manufacturing crack-free, undeformed cellular ceramic samples.We printed hexagonal honeycomb structures that showed exceptionally high specific strength under compression load and significantly enlarged the strength-density range that was covered by sintered capillary suspensions, so far. Without loss of mechanical strength the density of ceramic parts was decreased by about a factor of 2-3. Strength of in-plane and out-of-plane loaded hexagonal honeycomb structures varies according to common scaling laws for cellular structures. The honeycombs are mechanically more efficient than bulk specimens from capillary suspensions, since they show a distinctly lower sensitivity of strength on density. (C) 2017 Elsevier Ltd. All rights reserved.