Novel processing and characterization of Cu/CNF nanocomposite for high thermal conductivity applications

Silvain, Jean François; Vincent, Cécile; Heintz, Jean‐Marc; Chandra, Namas

doi:10.1016/j.compscitech.2009.06.023

Cited by 66 publications

(30 citation statements)

References 17 publications

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“…The thermal conductivity decreases sharply with increasing weight fraction of fibres. Hence the maximum thermal conductivity is observed for PLCr6 with ~200 W/Km, which is considerably lower than pure Cu (385 W/Km) but substantially higher than what has been observed for Cu/CNF composites before [39].…”

Section: Resultsmentioning

confidence: 93%

Thermomechanical properties of copper–carbon nanofibre composites prepared by spark plasma sintering and hot pressing

Ullbrand

Córdoba

Tamayo-Ariztondo

et al. 2010

Composites Science and Technology

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Several types of carbon nanofibres (CNF) were coated with a uniform and dense copper layer by electroless copper deposition. The coated fibres were then sintered by two different methods, spark plasma sintering (SPS) and hot pressing (HP). The Cu coating thickness was varied so that different volume fraction of fibres was achieved in the produced composites. In some cases, the CNF were pre-coated with Cr for the improvement the Cu adhesion on CNF. The results show that the dispersion of the CNF into the Cu matrix is independent of the sintering method used. On the contrary, the dispersion is directly related to the efficiency of the Cu coating, which is tightly connected to the CNF type. Overall, strong variations of the thermal conductivity (TC) of the composites were observed (20-200 W/mK) as a function of CNF type, CNF volume fraction and Cr content, while the coefficient of thermal expansion (CTE) in all cases was found to be considerably lower than Cu (9.9-11.3 ppm/K). The results show a good potential for SPS to be used to process this type of materials, since the SPS samples show better properties than HP samples even though they have a higher porosity, in applications where moderate TC and low CTE are required.

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Section: Resultsmentioning

confidence: 93%

Thermomechanical properties of copper–carbon nanofibre composites prepared by spark plasma sintering and hot pressing

Ullbrand

Córdoba

Tamayo-Ariztondo

et al. 2010

Composites Science and Technology

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“…Further, Cu/ CNF interface is very sharp with a high density of dislocation inside the Cu matrix and close to the CNF. Silvain et al (2009) have shown that dislocations occur due to the thermal stresses induced at the interface of fi ber-matrix with large differential CTE. It is postulated in their work that the different families of dislocations act to reduce the different types of stresses, (e.g.…”

Section: Microstructurementioning

confidence: 99%

The role of controlled interfaces in the thermal management of copper–carbon composites

Silvain

Veillère

Heintz

et al. 2012

Emerging Materials Research

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The increase in both power and packing densities in power electronic devices has led to an increase in the market demand for effective heat-dissipating materials, with high thermal conductivity and thermal-expansion coeffi cient compatible with chip materials still ensuring the reliability of the power modules. In this context, metal matrix composites: carbon fi bers, carbon nano fi bers and diamond-reinforced copper matrix composites among them are considered very promising as a next generation of thermal-management materials in power electronic packages. These composites exhibit enhanced thermal properties compared to pure copper combined with lower density. This article presents the fabrication techniques of copper/carbon composite fi lms by powder metallurgy and tape casting and hot pressing; these fi lms promise to be effi cient heat-dissipation layers for power electronic modules. The thermal analyses clearly indicate that interfacial treatments are required in these composites to achieve high thermomechanical properties. Interfaces (through novel chemical and processing methods), when selected carefully and processed properly will form the right chemical/mechanical link between copper and carbon, enhancing all the desired thermal properties while minimizing the deleterious effect. In this paper, a variety of methods that are system specifi c that achieve these goals are outlined. ice | science Emerging Materials Research Volume 1 Issue EMR2The role of controlled interfaces in the thermal management of copper-carbon composites Silvain et al.

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“…Several studies on the fabrication of CNT-dispersed composites, 3)5) alignment, 6), 7) and dispersion 8), 9) of CNT have been reported. However, the damage and wear resistance on CNTreinforced composites have been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Damage and wear resistance of Al<sub>2</sub>O<sub>3</sub>–CNT nanocomposites fabricated by spark plasma sintering

Lee

Jang

Sakka

2013

J. Ceram. Soc. Japan

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In this study, we prepare Al 2 O 3 CNT (carbon nanotube) composites with different contents of CNT, 120 vol % into the Al 2 O 3 ceramics, for the purpose of improving damage and wear resistance. Al 2 O 3 CNT composites are obtained by spark plasma sintering in conditions of 14001600°C in vacuum and 3080 MPa. Hardness evaluated by Vickers indentation shows that the hardness of Al 2 O 3 CNT composites can be enhanced when the CNT addition is less than 5 vol %. Toughness evaluated by Vickers indentation indicates that the toughness of the composites is comparable with that of an Al 2 O 3 monolith. Hertzian indentations using a spherical indenter indicate the hard and elastic behavior of the composites by the addition of CNT. The wear rate and friction coefficients of the composites evaluated by the ball-on-disk method show that the composites represent low friction and reduced wear loss under constant contact load. The results indicate that the damage and wear resistance of Al 2 O 3 ceramics can be enhanced by the addition of carbon nanotubes in optimum conditions.

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Novel processing and characterization of Cu/CNF nanocomposite for high thermal conductivity applications

Cited by 66 publications

References 17 publications

Thermomechanical properties of copper–carbon nanofibre composites prepared by spark plasma sintering and hot pressing

Thermomechanical properties of copper–carbon nanofibre composites prepared by spark plasma sintering and hot pressing

The role of controlled interfaces in the thermal management of copper–carbon composites

Damage and wear resistance of Al<sub>2</sub>O<sub>3</sub>–CNT nanocomposites fabricated by spark plasma sintering

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