Highly conductive graphite matrix/copper composites by a pressureless infiltration method

Wei, Wenfu; Li, Xiaobo; Yang, Zefeng; Huang, Zhanglin; Zuo, Haozi; Liao, Qianhua; Xie, Wenhan; Yin, Guofeng; Wu, Guangning

doi:10.1063/5.0056198

Cited by 10 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the 1980s, the metal impregnated carbon slide plate materials with low resistivity and high mechanical strength were developed in Japan, and gradually replaced the P/M slide plate [81][82][83]. The electrified railway in Britain began to use the metal impregnated carbon slide plate in 1987.…”

Section: Development Historymentioning

confidence: 99%

See 1 more Smart Citation

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Dong

et al. 2022

Rail. Eng. Science

Self Cite

View full text Add to dashboard Cite

As the unique power entrance, the pantograph–catenary electrical contact system maintains the efficiency and reliability of power transmission for the high-speed train. Along with the fast development of high-speed railways all over the world, some commercialized lines are built for covering the remote places under harsh environment, especially in China; these environmental elements including wind, sand, rain, thunder, ice and snow need to be considered during the design of the pantograph–catenary system. The pantograph–catenary system includes the pantograph, the contact wire and the interface—pantograph slide. As the key component, this pantograph slide plays a critical role in reliable power transmission under dynamic condition. The fundamental material characteristics of the pantograph slide and contact wire such as electrical conductivity, impact resistance, wear resistance, etc., directly determine the sliding electrical contact performance of the pantograph–catenary system; meanwhile, different detection methods of the pantograph–catenary system are crucial for the reliability of service and maintenance. In addition, the challenges brought from extreme operational conditions are discussed, taking the Sichuan–Tibet Railway currently under construction as a special example with the high-altitude climate. The outlook for developing the ultra-high-speed train equipped with the novel pantograph–catenary system which can address the harsher operational environment is also involved. This paper has provided a comprehensive review of the high-speed railway pantograph–catenary systems, including its progress, challenges, outlooks in the history and future.

show abstract

Section: Development Historymentioning

confidence: 99%

“…Some key parameters of metal impregnated carbon slide plates in different countries[73,81,[86][87][88] …”

mentioning

confidence: 99%

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Dong

et al. 2022

Rail. Eng. Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…Among them, the Cu‐C composite material that satisfies excellent thermal conductivity and low CTE is the most suitable as a heat dissipation material because it can efficiently disperse the generated heat at a low cost 18 . However, since Cu and C have insufficient wettability, heat transfer performance is lowered due to interface resistance 19,20 . In addition, graphite particles are difficult to be uniformly dispersed when forming the composite material due to a difference in density between composite materials, and layer structured graphite particles need to have orientation and be uniformly distributed in the matrix in order to improve thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…18 However, since Cu and C have insufficient wettability, heat transfer performance is lowered due to interface resistance. 19,20 In addition, graphite particles are difficult to be uniformly dispersed when forming the composite material due to a difference in density between composite materials, and layer structured graphite particles need to have orientation and be uniformly distributed in the matrix in order to improve thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Heat conduction and thermal expansion of copper–graphite composite as a heat sink

Lee

Son

Kim

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary This study presents the evaluation of the heat transfer characteristics and mechanical deformation of new composite material heat sinks using experimental and computational approaches. First, we synthesized a composite material composed of copper (Cu) and graphite (C) with 60 wt% Cu, with higher thermal conductivity and a lower thermal expansion coefficient than pure Cu and aluminum. The composite material was used to fabricate a heat sink integrated with an insulated‐gate bipolar mode transistor (IGBT) module for enhanced heat dissipation from the IGBT. Compared with the pure Cu heat sink, the composite heat sink decreases the average temperature of the IGBT module by approximately 22 K. It also decreases the total deformation of the heat sink caused by thermal expansion of the material by 78% and the equivalent stress by 25.2%. This study introduces a way to use Cu‐C composite materials in many potential applications, such as heat sinks integrated with IGBT inverters.

show abstract

“…However, the arc current of the pantographcatenary is about 10 7 times that of the partial arc current of the insulator, so the motion characteristics of the arc are also quite different from that of the pantograph-catenary arc. In terms of pantograph-catenary arc motion characteristics, the related studies mainly focus on arc motion characteristics and electrode ablation in the process of lowering the pantograph under atmospheric pressure [23][24][25][26][27][28][29]. However, the arc root motion characteristics, arc column longitudinal drift characteristics, and their influencing mechanism have not been studied in low air pressure (0.5-1 atm) and strong airflow.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of pantograph‐catenary arc under low air pressure and strong airflow

Gao

Wei

et al. 2021

High Voltage

Self Cite

View full text Add to dashboard Cite

Pantograph-catenary arc fault is the primary factor threatening the stability of the power transmission for high-speed railway. The motion characteristics of the pantographcatenary arc under low air pressure and strong airflow is significantly different from the case under atmospheric pressure. In this paper, an experimental platform of pantograph-catenary arc was built to investigate arc root position-time and arc column longitudinal drift height-time characteristic curves under different air pressures and airflow velocites. Via analysing the corresponding results, it can be found that there are different arc root-arc column traction mechanisms at different stages of arc development. The arcing time and arc root stagnation time under low air pressure are significantly longer than the case under atmospheric pressure, resulting in more serious electrode ablation. The arc column longitudinal drift velocity and height are greater with the increase of airflow velocity. Two typical irregular arc motion phenomena-arc root jumping and arc reignition are observed. To clarify the internal mechanism of the above phenomenon, a magnetohydrodynamics (MHD) model of the pantograph-catenary arc was lauched, the influence mechanism of the pantograph-catenary arc temperature and voltage are studied, and the physical process of arc temperature oscillation is analysed. The research results provide theoretical support for arc protection in high-altitude areas.

show abstract

Highly conductive graphite matrix/copper composites by a pressureless infiltration method

Cited by 10 publications

References 31 publications

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Pantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks

Heat conduction and thermal expansion of copper–graphite composite as a heat sink

Characteristics of pantograph‐catenary arc under low air pressure and strong airflow

Contact Info

Product

Resources

About