The wettability and interface thermal resistance of copper/graphite system with an addition of chromium

Tao, Zechao; Guo, Quangui; Gao, Xiaoqing; Liü, Lang

doi:10.1016/j.matchemphys.2011.03.003

Cited by 57 publications

(14 citation statements)

References 34 publications

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“…This can be easily broken during sliding, making the contiguous layers form a tribolayer on the contact surfaces that lowers the metallic contact area and does not significantly increase electric contact resistance (Zhan et al, 2003, 2004; Braunovic et al, 2010; Esezobor et al, 2011; Rajkumar et al, 2013). As a result several graphite-fiber and graphite-particulate copper reinforced composites that are mainly produced by the powder technology route (Tao et al, 2011) are commercially used as sliding contacts, industrial bearings and electric motor, and generator brushes (Zhan et al, 2003; Braunovic et al, 2010; Rajkumar et al, 2013). However, there are still two problems that hinder development and further application of advanced copper/graphite composites (Tao et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…As a result several graphite-fiber and graphite-particulate copper reinforced composites that are mainly produced by the powder technology route (Tao et al, 2011) are commercially used as sliding contacts, industrial bearings and electric motor, and generator brushes (Zhan et al, 2003; Braunovic et al, 2010; Rajkumar et al, 2013). However, there are still two problems that hinder development and further application of advanced copper/graphite composites (Tao et al, 2011). The low affinity between copper and graphite results in weak interfaces, with deleterious effects upon mechanical, thermal, and electric properties that limit performance and service life.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Changes in Copper–Graphite–Alumina Nanocomposites Produced by Mechanical Alloying

2014

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Microstructural features of nanostructured copper-matrix composites produced via high-energy milling were studied. Copper-graphite-alumina batches were planetary ball milled up to 16 h; copper-graphite batches were also prepared under the same conditions to evaluate the effect of contamination from the milling media. The microstructure of the produced materials was characterized by field emission gun scanning electron microscopy/energy-dispersive spectroscopy and related to Raman, X-ray diffraction, and particle size analysis results. Results showed that alumina was present in all milled powders. However, size reduction was effective at shorter times in the copper-graphite-alumina system. In both cases the produced powders were nanostructured, containing graphite and alumina nanoparticles homogeneously distributed in the copper matrix, especially for longer milling times and in the presence of added alumina. Copper crystallite size was significantly affected above 4 h milling; nanographite size decreased and incipient amorphization occurred. A minimum size of 15 nm was obtained for the copper crystallite copper-alumina-graphite composite powders, corresponding to 16 h of milling. Contamination from the media became more significant above 8 h. Results suggest that efficient dispersion and bonding of graphite and alumina nanoparticles in the copper matrix is achieved, envisioning high conductivity, high strength, and thermal stability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Changes in Copper–Graphite–Alumina Nanocomposites Produced by Mechanical Alloying

2014

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“…Since the coating thickness is very consistent, non-uniform diffusion of copper into the silver layer can be avoided. This is very critical because heterogeneity in the copper diffusion can cause undesirable thermal stress at high temperature [17,18]. Figure 6 shows the micrographs of the composites at 4wt.% Ag and 55vol.% CF.…”

Section: Characterizationmentioning

confidence: 99%

“…To overcome this challenge, carbide compounds were introduced as bonding interfaces. Molybdenum carbide, titanium carbide and boron carbide bond well to the carbon fibres thus improve the overall CTE of the composites [4][5][6][7][8][9]. But these carbides also have some disadvantages due to their low thermal conductivity and high density [10].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Copper Matrix Composites Reinforced Silver-Coated Carbon Fibres

Kamardin¹,

Derman²,

Rahmat³

et al. 2018

IJET

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Silver interface was developed to improve the thermal properties of copper matrix reinforced carbon fibre. The composites were made by coating the carbon fibres with silver and copper layers via the electroless coating process. The thermal conductivity and the thermal expansion of the composites were profiled by means of JMP Pro software. The experimental results showed that the weight-percent of silver and the volume-percent of the carbon fibre have significant effect on the thermal properties of the composites. The thermal conductivity and thermal expansion of the composites were also profoundly influenced by the anisotropic structure of the composites.

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“…Methods applicable to dispersed composites, like the thermal wave method proposed by Garnier [11], require complicated sample preparation and sophisticated experimental setup. For that reason, many researchers turned to indirect methods of evaluation of filler-matrix ITR, in which filler-matrix bond is recreated in larger scale [19,20] or with basic cylindrical geometry [10]. The downside of such approaches is the uncertainty of proper recreation of contact pressures, interfacial voids and other defects that are present in the actual composites, which have great influence on the value of ITR.…”

Section: Introductionmentioning

confidence: 99%

Application of flash method in the measurements of interfacial thermal resistance in layered and particulate composite materials

2017

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Presented study concerns the possibility of evaluation of interfacial thermal resistance (ITR) between the constituents in composite materials with the use of flash technique. Two variants of such measurement are considered, the first of which is the measurement of ITR between two bonded layers of different materials which had been studied before by various researchers. The second tested measurement method is targeted at determination of ITR in particulate composites with low and moderate filler content based on their effective thermal conductivity. Method of such measurement is proposed and tested on two cases of particle-filled polymer composites. Positive verification results were obtained for polymer/glass composite in which the difference between thermal conductivities of matrix and filler is low. For a polymer filled with aluminum particles the evaluation of average ITR in the samples was impossible as the effective medium models applied in the method strongly underestimated the thermal conductivity of that material. The investigation confirmed the need for more accurate methods of macroscopic thermal properties prediction for composite media with high contrast of thermal conductivities of the constituents. Extended literature study suggests that the method can be applicable to selected classes of engineering materials.

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The wettability and interface thermal resistance of copper/graphite system with an addition of chromium

Cited by 57 publications

References 34 publications

Microstructural Changes in Copper–Graphite–Alumina Nanocomposites Produced by Mechanical Alloying

Microstructural Changes in Copper–Graphite–Alumina Nanocomposites Produced by Mechanical Alloying

Fabrication and Characterization of Copper Matrix Composites Reinforced Silver-Coated Carbon Fibres

Application of flash method in the measurements of interfacial thermal resistance in layered and particulate composite materials

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