Electrical and thermal conductivities of the Cu–CF composite

Koráb, Juraj; Krcho, Stanislav; Štefánik, Pavol; Kováčik, Jaroslav

doi:10.1177/0021998319872261

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…% graphite contained a homogeneously dispersed copper phase in the entire volume of the composite (Figure 4). Figure 5 also indicates that, according to 3D images, a continuous copper skeleton was built inside the continuous graphite skeleton (volumetric copper cluster at Figure 5), similar to carbon-copper composites produced by gas pressure infiltration technology [32]. This microstructure likely significantly affects the values of CTE and other physical and mechanical properties of the Cu-graphite composites with a high volume fraction of graphite.…”

Section: Microstructural Analysis Using X-ray Tomographymentioning

confidence: 81%

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Structure and Thermal Expansion of Cu−90 vol. % Graphite Composites

Opálek

Emmer²,

Čička³

et al. 2021

Materials

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Copper–graphite composites are promising functional materials exhibiting application potential in electrical equipment and heat exchangers, due to their lower expansion coefficient and high electrical and thermal conductivities. Here, copper–graphite composites with 10–90 vol. % graphite were prepared by hot isostatic pressing, and their microstructure and coefficient of thermal expansion (CTE) were experimentally examined. The CTE decreased with increasing graphite volume fraction, from 17.8 × 10−6 K−1 for HIPed pure copper to 4.9 × 10−6 K−1 for 90 vol. % graphite. In the HIPed pure copper, the presence of cuprous oxide was detected by SEM-EDS. In contrast, Cu–graphite composites contained only a very small amount of oxygen (OHN analysis). There was only one exception, the composite with 90 vol. % graphite contained around 1.8 wt. % water absorbed inside the structure. The internal stresses in the composites were released during the first heating cycle of the CTE measurement. The permanent prolongation and shape of CTE curves were strongly affected by composition. After the release of internal stresses, the CTE curves of composites did not change any further. Finally, the modified Schapery model, including anisotropy and the clustering of graphite, was used to model the dependence of CTE on graphite volume fraction. Modeling suggested that the clustering of graphite via van der Waals bonds (out of hexagonal plane) is the most critical parameter and significantly affects the microstructure and CTE of the Cu–graphite composites when more than 30 vol. % graphite is present.

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Section: Microstructural Analysis Using X-ray Tomographymentioning

confidence: 81%

“…Cu-C composite materials can be made in several ways. Some of them are: accumulative rollbonding (ARB) [29,30], gas pressure infiltration of the molten Cu matrix into C powders, porous preform, or high modulus C fibers [31][32][33]. Another method is hot isostatic pressing (HIP) of the Cu and C powders [34].…”

Section: Introductionmentioning

confidence: 99%

Structure and Thermal Expansion of Cu−90 vol. % Graphite Composites

Opálek

Emmer²,

Čička³

et al. 2021

Materials

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“…Therefore, copper matrix composites got a great interest and are developed for many applications like heat exchangers, sensitive electrical circuits, brushes, springs, bearings, and bushing [5][6][7][8]. Among copper matrix composites, Cu-Fe composites got the attention of many researchers because of their low cost, compared with other metals beside their good mechanical properties [9][10][11][12][13][14][15][16]. Jerman, G.A.…”

Section: Introductionmentioning

confidence: 99%

Effect of Adding Nano Ag on Mechanical and Physical Properties of Cu–10% Fe Prepared by Powder Metallurgy Technique

Mahdi

Mahmood

2021

Tikrit j. eng. sci.

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Copper-matrix composites have received a lot of attention and are used widely in various applications, such as electronics, machinery, automobile, military and aerospace; because of their remarkable electrical conductivity, high thermal conductivity and excellent mechanical properties. Among these are copper-iron composites which found many engineering applications due to the role of Fe in enhancing the mechanical properties of these composites beside its low cost. However, Fe addition reduces electrical and thermal conductivity therefore, binary Cu-Fe composites are not suitable for applications where these properties are the main requirement. Many studies have been done to enhance these properties by the addition of alloying elements. The present work aims to study the effect of adding Nano Ag on mechanical and physical properties of Cu-10 wt% Fe composites prepared by powder metallurgy technique. The results showed the effectiveness of Nano Ag in enhancing both mechanical and physical properties of Cu-10 wt% Fe composite. It is found that bulk density, electrical conductivity, and thermal conductivity have been increased by 1.19%, 46%, and 46% respectively on adding 5% Nano Ag. Hardness and compression strength have been increased by 17.3% and 32.8% respectively by adding 4% Nano Ag, while wear rate was reduced by 13.4% by adding 4% Nano Ag.

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