Additive Manufacturing of Ductile, Ultrastrong Polymer-Derived Nanoceramics
Additive Manufacturing of Ductile, Ultrastrong Polymer-Derived Nanoceramics
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DOI：
10.1016/j.matt.2019.09.009
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发表时间：
2019-12-04
期刊：
影响因子：
18.9
通讯作者：
Valdevit, Lorenzo
中科院分区：
文献类型：
--
作者：
Bauer, Jens;Crook, Cameron;Valdevit, Lorenzo
如果能克服陶瓷的脆性和断裂强度分散的问题，它将是一种理想的工程材料。虽然已经报道了纳米级的延展性和非凡的强度，但当样品达到微米尺寸时，它们都会迅速消失；此外，制造仅限于精细的方法，本质上是纯粹的科学。在这里，我们提出了一种稳健的方法，通过先陶瓷树脂的双光子聚合直接激光写入(TPP-DLW)和随后的热解来添加制造延展性、超强碳化硅(SIOC)。我们3D打印微米大小的柱子和特征尺寸类似于200纳米的建筑材料，并在单轴压缩下对它们进行表征。与尺寸无关，SIOC微柱在检查的整个直径范围(1-20微米)内，以高达25%的应变和7 Gpa的强度持续塑性变形。我们的发现展示了以前所未有的规模直接制造延展性、超强陶瓷，这可能使制造尺寸高达数十毫米的工程系统成为可能。
Ceramics would be ideal engineering materials if their brittleness and scattered fracture strength could be overcome. While ductility and extraordinary strength have been reported at the nanoscale, they both rapidly disappear when samples reach micrometer dimensions; furthermore, manufacturing is limited to elaborate approaches, which are purely scientific in nature. Here, we present a robust route to additively manufacture ductile, ultrastrong silicon oxycarbide (SiOC) via two-photon polymerization direct laser writing (TPP-DLW) of a preceramic resin and subsequent pyrolysis. We 3D-print micrometer-size pillars and architected materials with feature sizes down to similar to 200 nm and characterize them under uniaxial compression. Independent of size, SiOC micropillars consistently deform plastically with strains up to 25% and strengths >7 GPa, across the entire range of examined diameters (1-20 mu m). Our findings demonstrate straightforward fabrication of ductile, ultrastrong ceramics at previously unprecedented scales, potentially enabling manufacturing of engineering systems up to tens of millimeters in size.