Additive Manufacturing and size-dependent mechanical properties of three-dimensional microarchitected, high-temperature ceramic metamaterials
Additive Manufacturing and size-dependent mechanical properties of three-dimensional microarchitected, high-temperature ceramic metamaterials
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DOI：
10.1557/jmr.2018.11
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发表时间：
2018-02-14
影响因子：
2.7
通讯作者：
Zheng, Xiaoyu
中科院分区：
文献类型：
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作者：
Cui, Huachen;Hensleigh, Ryan;Zheng, Xiaoyu
3D 微架构超材料因其小长度尺度和架构布局而表现出独特、理想的特性，这是其固体对应物和随机蜂窝结构无法实现的。然而，它们中很少有可以用于高温应用的，而高温应用可以从它们的超轻、超刚性特性中受益匪浅。现有的高温陶瓷材料通常很重并且难以加工成复杂的微型特征。受这一限制的启发，我们制造了聚合物衍生的陶瓷超材料，其尺寸从 10 流明到几毫米不等，相对密度低至 1% 至 22%。我们发现，这些具有相同 3D 拓扑的高温结构陶瓷表现出与尺寸相关的强度，受支柱直径和支柱长度的影响。利用威布尔理论来映射这种与不同的单个支柱体积的依赖性。这些观察结果证明了陶瓷材料增材制造中提高特征分辨率的结构优势。通过利用结构内单位支柱体积的减少，高温陶瓷可以实现高比强度，而重量仅为其固体同类产品的一小部分。
3D microarchitected metamaterials exhibit unique, desirable properties influenced by their small length scales and architected layout, unachievable by their solid counterparts and random cellular configurations. However, few of them can be used in high-temperature applications, which could benefit significantly from their ultra-lightweight, ultrastiff properties. Existing high-temperature ceramic materials are often heavy and difficult to process into complex, microscale features. Inspired by this limitation, we fabricated polymer-derived ceramic metamaterials with controlled solid strut size varying from 10-lm scale to a few millimeters with relative densities ranging from as low as 1 to 22%. We found that these high-temperature architected ceramics of identical 3D topologies exhibit size-dependent strength influenced by both strut diameter and strut length. Weibull theory is utilized to map this dependency with varying single strut volumes. These observations demonstrate the structural benefits of increasing feature resolution in additive manufacturing of ceramic materials. Through capitalizing upon the reduction of unit strut volumes within the architecture, high-temperature ceramics could achieve high specific strength with only fraction of the weight of their solid counterparts.