Making Ultra-Tough Nanoceramics by Columnar Submicrocrystals with Three-Level Micro-Nano Structures.
Making Ultra-Tough Nanoceramics by Columnar Submicrocrystals with Three-Level Micro-Nano Structures.
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DOI：
10.1002/smll.202105367
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发表时间：
2022-03
期刊：
影响因子：
13.3
通讯作者：
Yongdong Yu;Yongting Zheng;Xudong Liu;Yuchen Yuan;Xiaodong He
中科院分区：
文献类型：
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作者：
Yongdong Yu;Yongting Zheng;Xudong Liu;Yuchen Yuan;Xiaodong He
等轴纳米晶陶瓷的低断裂韧性是其广泛商业应用的主要瓶颈。在这里，作者报道了一种克服这一限制的方法，利用非晶态过饱和Al2O3/ZrO2固溶体微粉制备超韧纳米陶瓷，该陶瓷是通过Al-O2超高温燃烧合成辅助快速水冷制备的。含有非晶态和亚稳态枝晶固溶体的Al2O3/ZrO2微粉，在烧结或退火后可诱发高含量（高达70-90%）柱状亚微晶的三级微纳结构（亚微/纳米/超纳米）并伴有高密度纳米析出，使Al2O3/ZrO2陶瓷的断裂韧性提高高强度和高硬度的独特组合提高了50-100%。该方法有利于高性能陶瓷的微观结构设计，可广泛应用于各种陶瓷体系，且简单、成本低、效率高，适合工业化大批量生产具有特定晶粒几何形状的大尺寸纳米陶瓷。
The low fracture toughness of equiaxed nanocrystalline ceramics is the main bottleneck of its wide range of commercial applications. Here, the authors report a method to overcome this limitation for preparing ultra-tough nanoceramics from using amorphous and supersaturated Al2 O3 /ZrO2 solid solution micro-powders, which is fabricated by Al-O2 ultrahigh-temperature combustion synthesis assisted rapid water cooling. The Al2 O3 /ZrO2 micro-powders containing amorphous and metastable dendritic solid solutions can induce the three-level micro-nano structure (submicro/nano/supra-nano) of the high-content (up to 70-90%) columnar submicro-crystals accompanied with high-density nanoprecipitation after sintering or annealing, which makes the fracture toughness of Al2 O3 /ZrO2 ceramics with a unique combination of high-strength and high-hardness increased by 50-100%. This method is beneficial to microstructural design of high-performance ceramics and can be widely applied to various ceramic systems, coupled with simplicity, low-cost, and high-efficiency, making it suitable to industrially produce large-sized nanoceramics with specific grain geometry in large quantities.