Sliding wear behavior of copper–graphite composite material for use in maglev transportation system

Ma, Xiaomei; He, G.Q.; He, Dong; Chen, C.S.; Hu, Zhang

doi:10.1016/j.wear.2008.02.015

Cited by 122 publications

(55 citation statements)

References 14 publications

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“…While those with high graphite content are used with lower current densities and better cooling conditions. It has been reported that the addition of solid lubricant particles into a metal matrix improves not only the antifriction properties, but also wear and friction properties [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Graphite Content and Milling Time on Hardness, Compressive Strength and Wear Volume of Copper - Graphite Composites Prepared Via Powder Metallurgy

Mahdi¹,

Razooqi²,

Irhayyim³

2017

Tikrit j. eng. sci.

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Copper -graphite composites are widely used in sliding bearings and brushes due to their excellent thermal and electrical conductivities and high wear resistance. The aim of this research is to study the Influence of graphite content and milling time on hardness, compressive strength, wear volume and friction coefficient of copper -graphite composites prepared via powder metallurgy. A powder mixture containing 0,5,10,15,20 and 25 vol% graphite was milled for 1,3,5,7 and 9 hours. The milled mixture was cold pressed at 700 MPa for 30 second, followed by sintering at 900 o C for one hour. It was found through this work that increasing milling time results an appreciate increase in hardness and radial compressive strength, slight reduction in wear volume and slight increase in the coefficient of friction for all compositions except that for pure copper in which a considerable increase in wear volume and decrease in the coefficient of friction was observed. On the other hand, increasing the graphite volume fraction increases the composite hardness, till an optimum value, and decreases the radial compressive strength. A great decrease in both wear volume and coefficient of friction was observed on increasing graphite content up to 25 vol%. Finally, a graphite, cast iron chips and fireclay sintering configuration was found to be an effective procedure which minimize oxidation to levels comparative with those observed previously by sintering in argon or hydrogen atmospheres. Keywords:Copper -graphite composites, mechanical properties, milling time. ‫ن‬ ‫لمتراك‬ ‫لى‬ ‫ال‬ ‫حكب‬ ‫نطة‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫حج‬ ‫ا‬ ‫مالنوما‬ ‫الاومة‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫ال‬ ‫الص‬ ‫على‬ ‫الطحن‬ ‫وزمن‬ ‫الكرافيت‬ ‫محتوى‬ ‫تأثير‬ ‫الححنس‬ ‫ت‬

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Section: Introductionmentioning

confidence: 99%

The Influence of Graphite Content and Milling Time on Hardness, Compressive Strength and Wear Volume of Copper - Graphite Composites Prepared Via Powder Metallurgy

Mahdi¹,

Razooqi²,

Irhayyim³

2017

Tikrit j. eng. sci.

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“…With electric current, the total amount of heat produced during wear process comes from three symptoms: electric arc heat, friction heat and Joule heat [15]. The temperature of the arc plasma at the electrode is known to reach up to 3500-4000K [8,17]. The temperature of the surface and the subsurface where the arc is discharged increases promptly, which makes the composites be intenerated and deformed by friction force at high temperature and ultimately results in the increase of wear rate.…”

Section: War Rate Of the Compositesmentioning

confidence: 99%

“…The electric sliding wear behavior of Graphite/Cu composite material against a stainless steel band under power of maglev vehicle required was investigated by X.C.Ma et al [8], showing that arc erosion is one of the dominant wear mechanisms during the electric sliding wear process. Gra./Cu composites have attracted much attention due to the combined properties, such as thermal and electric conductivity characteristic of copper and solid lubricating property of graphite [9][10].…”

Section: Introductionmentioning

confidence: 99%

Tribological behaviors of Gra./Cu and CNTs/Cu composites with and without electric current

2018

MATEC Web Conf.

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Abstract. Gra./Cu composites and CNTs/Cu composites were respectively fabricated by powder metallurgy techniques. The experiments of high speed sliding with and without electric current were carried out to investigate their tribological behaviors. The results show that the friction coefficients and wear rates with electric current are higher than without electric current; under the same testing condition the friction coefficients and wear rates of CNTs/Cu are lower and the worn surfaces are more planar than Gra./Cu. CNTs can debase the effect of heat generating during sliding process on the composites. The tribological properties of CNTs/Cu composites are more excellent than Gra./Cu composites.

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“…The friction heat, Joule heat and arc discharge are main phenomena during friction and wear processes under electric current applied. So far, some scholars have studied the thermal wear and arc erosive damages of contact materials [1,2]. Their work mainly focused on the factors affecting thermal wear and arc erosive wear, such as electric current, normal load, sliding speed and contact characteristics [3,[4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Tribology Behaviors of Carbon Strip/Copper Contact Wire of Pantograph/Centenary System Under Electric Current

Ding¹,

Yuan²,

Fan³

et al. 2017

dtetr

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Abstract. The service life of pantograph/catenary system is determined by the wear performance of contact couple materials. The contact properties of pantograph/catenary system directly affect the stable operation and steady current-receiving of the electrical locomotives. A series of tests were carried out to study the tribology behavior of carbon strips and copper contact line with a high-speed friction and wear tester. The friction and wear behavior of carbon strips/copper contact line are significant affected by normal load, electric currents and sliding speed. By observing the different worn microscope of carbon strips, it can be found that the abrasive wear, adhesive wear and arc ablation are mainly wear mechanisms, accompanied by material transferring.

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Sliding wear behavior of copper–graphite composite material for use in maglev transportation system

Cited by 122 publications

References 14 publications

The Influence of Graphite Content and Milling Time on Hardness, Compressive Strength and Wear Volume of Copper - Graphite Composites Prepared Via Powder Metallurgy

The Influence of Graphite Content and Milling Time on Hardness, Compressive Strength and Wear Volume of Copper - Graphite Composites Prepared Via Powder Metallurgy

Tribological behaviors of Gra./Cu and CNTs/Cu composites with and without electric current

Tribology Behaviors of Carbon Strip/Copper Contact Wire of Pantograph/Centenary System Under Electric Current

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