Dual-nanoparticulate-reinforced aluminum matrix composite materials
Dual-nanoparticulate-reinforced aluminum matrix composite materials
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DOI：
10.1088/0957-4484/23/22/225704
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发表时间：
2012-06-08
期刊：
影响因子：
3.5
通讯作者：
Kawasaki, Akira
中科院分区：
文献类型：
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作者：
Kwon, Hansang;Cho, Seungchan;Kawasaki, Akira
采用机械球磨-热压工艺制备了碳纳米管（CNT）和纳米碳化硅（nano-SiC）增强铝基复合材料。纳米SiC被用作活性混合剂，用于将CNT分散在Al粉末中。通过增加纳米SiC颗粒的量，所产生的复合材料的硬度显著增加，比散装纯Al高8倍。通过TEM分析观察到少量的碳化铝（Al 4C 3），并使用X射线衍射进行定量。具有最高硬度值的复合材料含有一些纳米尺寸的Al 4C 3。沿着CNT和纳米SiC的加入，Al 4C 3也起到了增强复合材料硬度的作用。高能量研磨过程似乎导致高纵横比的CNT的均匀分散，以及几乎球形的纳米SiC颗粒在Al基体中。这种粉末冶金方法也可以应用于其他纳米增强复合材料，如陶瓷或复杂的基体材料。
Aluminum (Al) matrix composite materials reinforced with carbon nanotubes (CNT) and silicon carbide nanoparticles (nano-SiC) were fabricated by mechanical ball milling, followed by hot-pressing. Nano-SiC was used as an active mixing agent for dispersing the CNTs in the Al powder. The hardness of the produced composites was dramatically increased, up to eight times higher than bulk pure Al, by increasing the amount of nano-SiC particles. A small quantity of aluminum carbide (Al4C3) was observed by TEM analysis and quantified using x-ray diffraction. The composite with the highest hardness values contained some nanosized Al4C3. Along with the CNT and the nano-SiC, Al4C3 also seemed to play a role in the enhanced hardness of the composites. The high energy milling process seems to lead to a homogeneous dispersion of the high aspect ratio CNTs, and of the nearly spherical nano-SiC particles in the Al matrix. This powder metallurgical approach could also be applied to other nanoreinforced composites, such as ceramics or complex matrix materials.