An approach to the uniform dispersion of a high volume fraction of carbon nanotubes in aluminum powder

Jiang, Lin; Fan, Genlian; Li, Zhiqiang; Kai, Xizhou; Zhang, Di; Chen, Zhuo; Humphries, S. R.; Heness, Greg; Yeung, Wing Yiu

doi:10.1016/j.carbon.2011.01.021

Cited by 191 publications

(62 citation statements)

References 24 publications

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“…The Al flakes were then treated in 3 wt.% PVA aqueous solution to introduce a hydrophilic PVA membrane on the surface of the Al flakes. Details of the surface modification have been reported elsewhere [19]. (3) Adsorption and reduction of GO nanosheets.…”

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confidence: 99%

Reinforcement with graphene nanosheets in aluminum matrix composites

et al. 2012

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Reinforcement with graphene nanosheets in aluminum matrix composites

et al. 2012

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“…Formation of flaky powders were attributed to the good plastic deformability and the assistant effect of stearic acid. The flattening and welding of Al powders were common phenomena observed in the high-energy ball milling process [8,13]. A very uniform CNT dispersion was observed at a high-magnification view on the powder surface ( Figure 2b).…”

Section: Resultsmentioning

confidence: 89%

“…In Stage I, the electrical conductivity was very low near 0, suggesting the high electron transfer resistance [6] through primary particle boundaries, which were mainly made of alumina films ( Figure 5). It has been reported that, as ball milling was applied to Al powders, a high oxygen concentration was produced, resulting in more and thicker alumina films [8]. Therefore, at Stage I, the diffusion of oxygen atoms and the morphology change of the alumina film might be small.…”

Section: Discussionmentioning

confidence: 99%

“…A homogeneous CNT dispersion in composites is the precondition, because there is little bonding between matrix and the CNTs inside CNT clusters, which is detrimental for effective load transfer [6]. To overcome the problems of CNT agglomeration, some novel methods, such as the in-situ grown method [7], flake powder metallurgy [8], friction stir welding [9], and solution ball milling (SBM) [10], have been recently developed. Afterward, how to effectively consolidate CNT-Al powder mixtures to bulk materials became a concentrated topic.…”

Section: Introductionmentioning

confidence: 99%

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Sintering Behaviors of Carbon Nanotubes—Aluminum Composite Powders

Chen

Kondoh

2016

Metals

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Carbon nanotubes (CNTs) are promising reinforcements for fabricating aluminum (Al) matrix composites with outstanding properties. The understanding of the consolidation process of CNT-Al composite powders plays a significant role in achieving high performances of bulk composites. In this study, an advanced consolidation technique of spark plasma sintering (SPS) was used to fabricate CNT-Al composites with homogeneously dispersed CNTs. The sintering kinetics of pure Al powders and those powders coated with 1 wt % CNTs were studied. By combining the electrical conductivity and relative density results, it was found that the sintering process consisted of two stages with distinct densification rates. The second stage with a much lower rate was governed by the breaking down of alumina films at primary particle boundaries. The activation energy of the controlling second stage increased by 55% in CNT-Al composite powders compared to that of pure Al powder. As a result, CNT addition led to the overall decrease of sintering ability, which raised a challenge in the processing of CNT-Al composites.

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“…The FTIR spectrum for GO (Figure 7b) reveals that GO is fabricated with large amounts of hydrophilic oxygen-containing groups, such as -OH, -COOH, and -C=O, endowing the GO with hydrophilic surface property, are very similar to the -COOH functionalized carbon nanotubes [26]. However, due to the naturally-formed alumina film, 7075 Al powder is identified as hydrophobic [26]. The contradictory water wettability determines that the GO can hardly form a homogeneous distribution with the unmodified 7075 Al powders through stirring.…”

Section: Discussionmentioning

confidence: 99%

Reduced Graphene Oxide Reinforced 7075 Al Matrix Composites: Powder Synthesis and Mechanical Properties

Sun

Zhang

Лиу

et al. 2017

Metals

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Abstract:Reduced graphene oxide (rGO) reinforced 7075 Al matrix composites were fabricated by electrostatic self-assembly and powder metallurgy. 7075 Al powders were surface modified by introducing a cetyl trimethyl ammonium bromide (CTAB) membrane on the surface, which was able to form a strong bonding with graphene oxide (GO) through electrostatic interaction. During the vacuum sintering process, CTAB was effectively removed and GO was thermally reduced into rGO. Morphologies of GO nanosheets, GO/7075 Al powders, microstructures, and tensile fractographs of the composites were observed. The effect of rGO content on mechanical properties of rGO/7075 Al composites was investigated. The results show that a good bonding between rGO and matrix is achieved. With the rGO content increasing, the hardness increases gradually, while the ultimate tensile strength and yield strength initially increase and later decrease. The improvement in strength of rGO/7075 Al composites was attributed to stress transfer and dislocation strengthening. With rGO content reaching 0.50 wt %, the excessive addition of rGO gave rise to a weakening in the enhancement of the tensile properties due to the increasing amounts of brittle Al 4 C 3 and cracks.

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An approach to the uniform dispersion of a high volume fraction of carbon nanotubes in aluminum powder

Cited by 191 publications

References 24 publications

Reinforcement with graphene nanosheets in aluminum matrix composites

Reinforcement with graphene nanosheets in aluminum matrix composites

Sintering Behaviors of Carbon Nanotubes—Aluminum Composite Powders

Reduced Graphene Oxide Reinforced 7075 Al Matrix Composites: Powder Synthesis and Mechanical Properties

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