Geologically-inspired strong bulk ceramics made with water at room temperature.
Geologically-inspired strong bulk ceramics made with water at room temperature.
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DOI：
10.1038/ncomms14655
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发表时间：
2017-03-06
影响因子：
16.6
通讯作者：
Studart AR
中科院分区：
文献类型：
--
作者：
Bouville F;Studart AR
致密的陶瓷材料可以在自然界中在温和的水中形成。相比之下，人造陶瓷通常需要超过1400°C的烧结温度才能致密化。受生物矿化过程启发的化学策略已经被证明，但仍然局限于薄膜和颗粒的制造。除了生物矿化作用外，在自然界中也通过大规模的地质作用形成了致密的类陶瓷材料，如石灰石。受自然界矿物沉积物的地质压实作用的启发，我们报告了一种室温方法，可以在与传统制造工艺相当的时间尺度内生产致密而坚固的陶瓷。使用纳米级粉末和高压压实，我们证明了这种冷烧结过程可以在室温下用水实现，从而产生厘米大小的大块部件，其比强度与混凝土等传统结构材料相当，有时甚至高于它们。加工陶瓷的温和条件是一系列用途的兴趣。在这里，作者报告了使用溶液辅助路线室温烧结纳米颗粒粉末，产生具有厘米大小的大块部件的部件，其比强度可与传统结构材料（如混凝土）相媲美，甚至可能超过。
Dense ceramic materials can form in nature under mild temperatures in water. By contrast, man-made ceramics often require sintering temperatures in excess of 1,400 °C for densification. Chemical strategies inspired by biomineralization processes have been demonstrated but remain limited to the fabrication of thin films and particles. Besides biomineralization, the formation of dense ceramic-like materials such as limestone also occurs in nature through large-scale geological processes. Inspired by the geological compaction of mineral sediments in nature, we report a room-temperature method to produce dense and strong ceramics within timescales comparable to those of conventional manufacturing processes. Using nanoscale powders and high compaction pressures, we show that such cold sintering process can be realized with water at room temperature to result in centimetre-sized bulk parts with specific strength that is comparable to, and occasionally even higher than, that of traditional structural materials like concrete. Milder conditions for processing ceramics is of interest for a range of uses. Here authors report room temperature sintering of nanoparticulate powders using a solution-assisted route, yielding parts with centimetre-sized bulk parts with specific strength comparable to and possibly surpassing that of traditional structural materials like concrete.