High volume fraction and uniform dispersion of carbon nanotubes in aluminium powders
High volume fraction and uniform dispersion of carbon nanotubes in aluminium powders
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DOI：
10.1049/mnl.2010.0158
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发表时间：
2010-12
影响因子：
1.3
通讯作者：
Zhiqiang Li;Lin Jiang;G. Fan;Yong Xu;Di Zhang;Zhixin Chen;S. R. Humphries
中科院分区：
文献类型：
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作者：
Zhiqiang Li;Lin Jiang;G. Fan;Yong Xu;Di Zhang;Zhixin Chen;S. R. Humphries
采用料浆法将高体积分数的碳纳米管(CNTs)分散在铝粉中。在该工艺中，使用了高比表面积的纳米铝粉，并用聚乙烯醇(PVA)水溶胶对其表面进行了改性，然后将其与碳纳米管水分散体混合。PVA改性使铝粉表面形成了一层亲水膜，提高了铝粉的润湿性，使铝粉的表面性质与碳纳米管的表面性质更相容。此外，PVA膜与碳纳米管形成相对较强的键，防止碳纳米管在后续加工过程中团聚。结果表明，纳米Al粉中碳纳米管具有较高的体积分数和高达10%的均匀分散性。
A slurry-based powder process was developed to disperse a high volume fraction of carbon nanotubes (CNTs) in aluminium (Al) powders. In this process, Al nanoflake powders with a high surface area were used and the powder surface was modified by polyvinyl alcohol (PVA) hydrosol before being mixed with CNTs aqueous dispersion. The PVA modification resulted in the formation of a hydrophilic membrane on the Al surface, which enhanced the water wettability and makes the surface property of the Al powder more compatible with that of the CNTs. Furthermore, the PVA membrane forms relatively strong bonds with the CNTs and prevent them from agglomeration during subsequent processing. Consequently, a high volume fraction and uniform dispersion of up to 10 vol% CNTs was achieved in the Al nanoflake powders.