Nanoindentation-based study of the mechanical behavior of bulk supercrystalline ceramic-organic nanocomposites
Nanoindentation-based study of the mechanical behavior of bulk supercrystalline ceramic-organic nanocomposites
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DOI：
10.1016/j.jeurceramsoc.2019.03.053
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发表时间：
2019-08-01
影响因子：
5.7
通讯作者：
Schneider, Gerold A.
中科院分区：
文献类型：
--
作者：
Bor, Buesra;Giuntini, Diletta;Schneider, Gerold A.
大块多超晶陶瓷有机纳米复合材料的生产和表征与纳米压痕为基础的研究。这些纳米复合材料使用两种不同的程序进行处理，以比较它们的性质与和没有交联的有机配体介接陶瓷纳米颗粒。连同预期的材料强化引起的交联，一个独特的反应出现时，使用布氏和立方角压头。超结晶材料易于发生压实、开裂和碎裂现象，当采用更尖锐的尖端时，这些现象变得更加严重，这意味着布氏压头更适合于评估弹性模量和硬度。另一方面，立方角尖端用于断裂韧性的调查，比较两种方法和多种模型可从文献中获得。断裂韧性的结果表明，裂纹演变的四分之一便士形的轮廓在的角，和外在的增韧机制，如塑性变形和裂纹偏转，发挥了重要的作用。
Bulk poly-supercrystalline ceramic-organic nanocomposites were produced and characterized with a nanoindentation-based study. These nanocomposites were processed using two different routines, to compare their properties with and without crosslinking the organic ligands interfacing the ceramic nanoparticles. Together with the expected material strengthening induced by crosslinking, a distinct response emerges when using Berkovich and cube-corner indenters. The supercrystalline materials are prone to compaction, cracking and chipping phenomena that become more severe when a sharper tip is employed, implying that a Berkovich indenter is more suitable for the evaluation of elastic modulus and hardness. The cube-corner tip, on the other hand, is employed for the investigation of fracture toughness, comparing two methods and multiple models available from the literature. The fracture toughness outcomes suggest that cracks evolve with a quarter-penny shaped profile at the indent's corners, and that extrinsic toughening mechanisms, such as plastic-like deformation and crack deflection, play a significant role.