High-Temperature Stability of a Nanostructured Cu-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Alloy

Marques, M.T.; Correia, José Brito; Criado, Julio J.; Diánez, M. J.; Matteazzi, P.

doi:10.4028/www.scientific.net/kem.230-232.652

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…[4][5][6][7][8] In effect, the variation in lattice parameter obtained from the Cu210C (at.-%) mixture after milling for 36 ks (Da Cu 50 . 00011 nm) (Ref.…”

Section: Resultsmentioning

confidence: 99%

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Transmission electron microscopy study of copper–carbon nanocomposite

Carvalho¹,

Fonseca²,

Marques³

et al. 2006

Materials Science and Technology

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A Cu210C nanocomposite has been synthesised by high energy milling of elemental powders, followed by annealing at 873 K. Phase identification and microstructure characterisation have been carried out with transmission electron microscopy. Copper grain size ranged from 10 to 120 nm for the as milled material and from 10 to 150 nm after annealing. No graphite reflections could be detected by electron diffraction in either the as milled or annealed samples. Nevertheless, both conditions contain clusters of carbon of ,10 nm, which could be of benefit for sliding wear applications. The lattice parameter measured after milling is compatible with a carbon solubility in the copper matrix ,0 . 1 at.-%. The synthesised material showed excellent structural stability at 873 K, which is proposed to be dependent on solute drag effects resulting from boundary segregation. In fact, no grain boundary pinning by nanoparticles has been detected while a decrease in lattice parameter occurred during annealing.

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“…[4][5][6][7][8] In effect, the variation in lattice parameter obtained from the Cu210C (at.-%) mixture after milling for 36 ks (Da Cu 50 . 00011 nm) (Ref.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of amorphous carbon clusters explains the apparently modest increase in lattice parameter reported by several authors in mechanically alloyed Cu2C systems. [4][5][6][7][8] In effect, the variation in lattice parameter obtained from the Cu210C (at.-%) mixture after milling for 36 ks (Da Cu 50 . 00011 nm) (Ref.…”

Section: Resultsmentioning

confidence: 99%

Transmission electron microscopy study of copper–carbon nanocomposite

Carvalho¹,

Fonseca²,

Marques³

et al. 2006

Materials Science and Technology

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“…Most studies focus on the microstructure, physical and electrical properties of Al 2 O 3 /Cu composite (Ref [5][6][7][8][9][10][11][12][13][14], but no literatures on the relationship between microstructure and arc erosion behavior of Al 2 O 3 /Cu composite have been reported. In this investigation, Al 2 O 3 /Cu composite was prepared by external addition of Al 2 O 3 and the effect of Al 2 O 3 content on hardness, electrical conductivity, breakdown strength, chopping current and arc life was studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al2O3 Content on Electrical Breakdown Properties of Al2O3/Cu Composite

Wang

Yang

Fan

2010

J. of Materi Eng and Perform

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Al 2 O 3 /Cu composites were prepared by external addition of Al 2 O 3 , and the effect of Al 2 O 3 content on microstructure, density, hardness, electrical conductivity and vacuum electrical breakdown properties was studied. The results show that with increasing Al 2 O 3 addition, the density of Al 2 O 3 /Cu composite significantly decreases, the hardness sharply increases and then slowly decreases, but the electrical conductivity invariably decreases. The vacuum breakdown test shows that with increasing Al 2 O 3 addition, the breakdown strength first sharply increases and then decreases when the Al 2 O 3 content exceeds 1.2 wt.%; the chopping current always exhibits a decreasing trend and the arc life first increases and then decreases. According to the morphology of arc erosion and analysis, the arc erosion resistance increases and then decreases sharply. In the range of experiments, the optimal arc erosion resistance of Al 2 O 3 /Cu composite can be obtained with the addition of 1.2 wt.% Al 2 O 3 .

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“…Copper matrix composites reinforced with metallic precipitates, i.e. in situ composites, or ceramic particles, like Al2O3, ZrO2 or TiC [1], [2] and [3], have received a great deal of attention in recent years. These composites possess advantageous properties, in particular, high electrical and thermal conductivity and good mechanical properties.…”

Section: Introductionmentioning

confidence: 99%