Copper-Carbon and Aluminum-Carbon Composites Fabricated by Powder Metallurgy Processes

Silvain, Jean François; Veillère, Amélie; Lu, Yongfeng

doi:10.1088/1742-6596/525/1/012015

Cited by 30 publications

(30 citation statements)

References 9 publications

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“…Due to the typical flat geometry of electronic components, the low CTE of the heat sinks is required in at least two dimensions, which can be provided by a planar distribution of the CF . We obtain this distribution by powder metallurgy with a uniaxial compression of the matrix‐fibres mixture, improving the TC and drastically reducing the CTE in the plane in comparison to the metal matrix.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Oddone

Reich

2017

Physica Rapid Research Ltrs

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High thermal conductivity (TC) and a tunable coefficient of thermal expansion are essential properties for heat management materials operating in a wide temperature range. We combine both properties in a composite with a low-density metal matrix reinforced with pitch-based carbon fibres. The thermal conductivity of the metal matrix was increased by 50%, the thermal expansion coefficient was reduced by a factor of five. The samples were produced by powder metallurgy and have a planar random distribution of fibres, leading to high performance in two dimensions.Surface of a metal matrix composite with 50% carbon fibre (CF) strengthening (optical microscope, 20Â magnification). RapidResearch Letter 1700090 (4 of 5) V. Oddone and S. Reich: Thermal properties of metal matrix composites ß

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Section: Introductionmentioning

confidence: 99%

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Oddone

Reich

2017

Physica Rapid Research Ltrs

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“…After post-processing via ECAE the thermal conductivity in the inplane direction greatly improved reaching the maximum thermal conductivity after 6 passes (C1.5 6p,1 ). Silvain et al [23] reported the production of AMCs via hot pressing using pitch-based CFs from the same manufacturer as those used in this study. They found that a CF volume content v f = 0.1, only had an increase of ΔK c, 1 = 9 W m −1 K −1 (~4.6%).…”

Section: Discussionmentioning

confidence: 99%

Processing, structure and thermal conductivity correlation in carbon fibre reinforced aluminium metal matrix composites

et al. 2018

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Al matrix composites reinforced with Cu-coated pitch-based carbon fibres (Al/Cu-CFs) were fabricated, using a novel combination of rheocasting and equal channel angular extrusion (ECAE) techniques, in order to exploit the thermal conductivity (K) of the material. Rheocasting allowed the introduction and dispersion of Cu-CFs within the Al 3 Mg matrix. The subsequent ECAE processing reduced the porosity of the composites from 3 to 0.03% and induced a high degree of fibre alignment within the matrix, although considerable damage to the fibres occurred during this processing step. After 6 ECAE passes, in which the billet orientation remained constant, the composite with the highest degree of fibre alignment show a thermal conductivity (K) improvement of~20% with respect to the rheocast composite. The improvement is due to porosity reduction, improved fibre alignment and forced intimate contact of clean CF surfaces with the matrix.

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“…If the different thermal expansion is not absorbed by flexible components, the induced stress will weaken the structure and may cause failure. Carbon based particles and fibers are widely used as filler in metal matrices for reducing the CTE [3,4,13,[5][6][7][8][9][10][11][12]. Carbon fibers and carbon nanotubes have a low or negative CTE along the fiber direction, graphene and graphite flakes along the crystal lattice plane.…”

Section: Introductionmentioning

confidence: 99%

Understanding the negative thermal expansion in planar graphite–metal composites

2018

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The addition of graphitic fibers and flakes as fillers is commonly used to control the thermal expansion of metals. Sintered metal matrix composites with a planar distribution of graphite flakes show a low or negative thermal expansion coefficient perpendicular to the orientation plane of the graphite (z-CTE). Since the metal matrix has a positive isotropic expansion and graphite has a high z-CTE, this effect cannot be explained by a simple model of stapled metalgraphite layers. Instead, a mechanical interaction between graphite and matrix must be considered. With neutron scattering measurements we show that there is little or no strain of the graphite flakes caused by the matrix, which can be explained by the high modulus of graphite. Instead, we suggest that a macroscopic crumpling of the flakes is responsible for the low z-CTE of the composite. The crumpled flakes are thicker at low temperature and get stretched and flattened by the expanding matrix at high temperature, explaining the reduction in the thermal expansion across the orientation plane.

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Copper-Carbon and Aluminum-Carbon Composites Fabricated by Powder Metallurgy Processes

Cited by 30 publications

References 9 publications

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Thermal properties of metal matrix composites with planar distribution of carbon fibres

Processing, structure and thermal conductivity correlation in carbon fibre reinforced aluminium metal matrix composites

Understanding the negative thermal expansion in planar graphite–metal composites

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