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首页> 外文期刊>Materials Science and Engineering >Temperature and load dependent mechanical properties of pressureless sintered carbon nanotube/alumina nanocomposites
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Temperature and load dependent mechanical properties of pressureless sintered carbon nanotube/alumina nanocomposites

机译：无压烧结碳纳米管/氧化铝纳米复合材料的温度和负荷相关力学性能

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摘要

Multiwalled carbon nanotube (MWCNT)/alumina (Al_2O_3) nanocomposites having different CNT contents have been fabricated by wet-mixing and pressureless sintering in Argon at 1700 ℃. Depending on indentation load, the highest improvement of 15-34% in hardness was achieved in 0.3 vol.% MWCNT/Al_2O_3 nanocomposite. Indentation size effect (Mayer's exponent = 1.753) on hardness was the most prominent in 1.2 vol.% MWCNT/Al_2O_3 nanocomposite due to presence of clustered CNTs, non-uniform interface and porous microstructure. ～34% increase in fracture toughness was achieved in 0.3 vol.% MWCNT/Al_2O_3 nanocomposite than pure Al_2O_3 (~3.84 MPa m~(0.5)). High MWCNT loaded nanocomposites had reduced R-curve sensitivity because of increased matrix grain refining effect and reduced matrix compressive residual stress. High temperature flexural strength results indicated that strength retention of nanocomposites up to 1100 ℃ in ambient was much better compared to pure Al_2O_3. To predict structure-property relationship in nanocomposites, detailed microstructural and fractographic studies were also performed.
机译：在1700℃的氩中湿法混合和无压烧结，制备出碳纳米管含量不同的多壁碳纳米管（MWCNT）/氧化铝（Al_2O_3）纳米复合材料。取决于压痕负荷，在0.3体积％的MWCNT / Al_2O_3纳米复合材料中，硬度最高提高了15-34％。由于存在簇状CNT，不均匀的界面和多孔的微观结构，压痕尺寸效应（Mayer指数= 1.753）对硬度的影响最大，在1.2％（体积）的MWCNT / Al_2O_3纳米复合材料中。相对于纯Al_2O_3（〜3.84 MPa m〜（0.5）），在0.3 vol。％MWCNT / Al_2O_3纳米复合材料中，断裂韧性提高了约34％。由于增加的基体晶粒细化效果和降低的基体压缩残余应力，高MWCNT负载的纳米复合材料的R曲线敏感性降低。高温弯曲强度结果表明，与纯Al_2O_3相比，纳米复合材料在高达1100℃的环境中的强度保持力要好得多。为了预测纳米复合材料的结构-性质关系，还进行了详细的微观结构和分形学研究。

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