Additive Manufacturing of Yttrium-Stabilized Tetragonal Zirconia: Progressive Wall Collapse, Martensitic Transformation, and Energy Dissipation in Micro-Honeycombs
Additive Manufacturing of Yttrium-Stabilized Tetragonal Zirconia: Progressive Wall Collapse, Martensitic Transformation, and Energy Dissipation in Micro-Honeycombs
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DOI：
10.1016/j.addma.2022.102692
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发表时间：
2022-02
影响因子：
11
通讯作者：
H. Rauch;Huachen Cui;Kendall P. Knight;R. J. Griffiths;Jake K. Yoder;X. Zheng;Hang Z. Yu
中科院分区：
文献类型：
--
作者：
H. Rauch;Huachen Cui;Kendall P. Knight;R. J. Griffiths;Jake K. Yoder;X. Zheng;Hang Z. Yu
对于基于氧化锆的技术陶瓷，由于增材制造的限制，微结构几何形状与强大的机械和功能特性相结合的独特优势一直难以实现。在这项工作中，我们提出了一种基于立体光刻的增材制造方法，涉及钇稳定的四氧化锆多晶（Y-TZP）的浆料开发，然后使用定制的大面积投影微立体光刻系统进行打印。在后处理之后，即，聚合物燃尽和烧结，在印刷的Y-TZP部件中达到98%的相对密度。由于良好的制造质量，大规模的Y-TZP微蜂窝能够在面外压缩中显示出典型的拉伸主导行为，显示出弹性加载（阶段I）和单个壁在显著应变下的持久脆性破坏（阶段II）。对于壁厚为300 μm、孔径为1.40mm的5 × 4六角形蜂窝结构的Y-TZP微蜂窝，测得其能量耗散密度为9.45J/g，明显高于以往报道的其它陶瓷蜂窝和填料。这种能量耗散能力主要归因于在第二阶段变形中看到的渐进式墙体倒塌，其中周边墙体相对于内墙优先破碎。根据有限元分析，这种现象是偏离单轴压缩和周边墙中存在应力梯度的结果。我们还发现了应力诱导马氏体相变的证据在Y-TZP微蜂窝压缩后，这可能是另一个贡献者观察到的能量耗散能力。
For zirconia-based technical ceramics, the unique advantages of micro-architecture geometries combined with the potent mechanical and functional properties have been challenging to implement owing to additive manufacturing restrictions. In this work, we present a stereolithography-based additive manufacturing approach involving slurry development for yttrium-stabilized tetragonal zirconia polycrystals (Y-TZP), followed by printing using a custom-built large-area projection micro-stereolithography system. After post-processing, i.e., polymer burnout and sintering, 98% relative density is reached in the printed Y-TZP parts. Thanks to the good manufacturing quality, the bulk-scale Y-TZP micro-honeycombs are able to display typical stretch-dominated behavior in out-of-plane compression, showing elastic loading (Stage I) and protracted brittle failure of individual walls over a significant strain (Stage II). For a Y-TZP micro-honeycomb consisting of 5 × 4 hexagonal cells with a wall thickness of 300 μm and a cell diameter of 1.40 mm, the energy dissipation density is measured to be 9.45 J/g, substantially higher than other ceramic honeycombs and packings reported earlier. This energy dissipation capability is mostly attributed to the progressive wall collapse seen in Stage II deformation, in which the perimeter walls are preferentially fragmented relative to the interior walls. According to finite element analysis, this phenomenon is a result of the deviation from uniaxial compression and the presence of stress gradients in the perimeter walls. We also find evidence for stress-induced martensitic transformation in the Y-TZP micro-honeycomb after compression, which may be another contributor to the observed energy dissipation capability.