Carbon nanotubes: do they toughen brittle matrices?
Carbon nanotubes: do they toughen brittle matrices?
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DOI：
10.1007/s10853-011-5387-x
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发表时间：
2011-07-01
影响因子：
4.5
通讯作者：
Boccaccini, Aldo R.
中科院分区：
文献类型：
--
作者：
Cho, Johann;Inam, Fawad;Boccaccini, Aldo R.
模型CNT-脆性基质复合材料系统的开发基于含有高达15重量%的分散良好的CNT的SiO（2）玻璃，允许直接评估纳米级填料对断裂韧性（K（IC））的影响。通过胶体异质凝聚，然后通过放电等离子体烧结制备样品。详细的K（IC）的测量，使用压痕和缺口梁技术，显示出与CNT含量的线性改善，在最大载荷下的断裂韧性增加了两倍。在这项研究中使用的两种方法的结果显示相同的趋势，但不同的绝对值，这两种方法来测量纳米复合材料的韧性的相对优点进行了比较。可能的韧化机制与CNT拔出，裂纹桥接，裂纹偏转确定，并定量讨论，借鉴传统的短纤维复合材料理论和缩放纤维直径的潜在影响。
The development of a model CNT-brittle matrix composite system, based on SiO(2) glass containing well-dispersed CNTs at up to 15 wt%, allows a direct assessment of the effect of the nanoscale filler on fracture toughness (K (IC)). Samples were prepared by colloidal heterocoagulation followed by spark plasma sintering. Detailed K (IC) measurements, using both indentation and notched beam techniques, show a linear improvement with CNT content, with up to a twofold increase of fracture toughness at maximum loading. The results from the two methods used in this study show equivalent trends but differing absolute values; the relative merits of these two approaches to measuring nanocomposite toughness are compared. Possible toughening mechanisms associated with CNT pull-out, crack bridging, and crack deflection are identified, and discussed quantitatively, drawing on conventional short-fibre composite theory and the potential effects of scaling fibre diameter.