Effect of the ratio of graphite/pitch coke on the mechanical and tribological properties of copper–carbon composites

Yang, Huijun; Luo, Ruiying; Han, Shuang; Li, Midan

doi:10.1016/j.wear.2010.02.007

Cited by 52 publications

(33 citation statements)

References 18 publications

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“…Figure ( 12) shows that increasing milling time produces a slight increase in friction coefficient due to the increase in bonding between copper and graphite particles on increasing milling period, which in turn prevents graphite from being squeezed out and reduces the thickness of the graphite lubrication film between the composite specimen and the disc or breaks its continuity. These effects leads to an increase in the coefficient of friction as was found by previous works [8,11]. …”

Section: Effect Of Milling Time On Wear Volume and Coefficient Of Frisupporting

confidence: 76%

“…(6). This attribution is assisted by Moustafa et al [14] and Yang et al [8] who formulate the relationship between the hardness and wear volume as follows:…”

Section: Effect Of Milling Time On Wear Volume and Coefficient Of Frimentioning

confidence: 99%

“…Moreover, graphite has low density as compared with copper. These two reasons excluded casting and made powder metallurgy the most suitable technique used to produce such composites [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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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: Effect Of Milling Time On Wear Volume and Coefficient Of Frisupporting

confidence: 76%

“…(6). This attribution is assisted by Moustafa et al [14] and Yang et al [8] who formulate the relationship between the hardness and wear volume as follows:…”

Section: Effect Of Milling Time On Wear Volume and Coefficient Of Frimentioning

confidence: 99%

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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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“…During the process of friction, carbon fibers act as a skeleton support. The actual contact area with the counterpart is small, thereby resulting in difficulties in the formation of a lubricating film [31,32]. As a result, the friction coefficient of the steeped metal slide was the smallest.…”

Section: Friction Coefficient and Frictional Behavior Of The Compositesmentioning

confidence: 99%

Effect of Al–Mg Alloy Infiltration on Mechanical and Electrical Properties for Carbon/Carbon Composites

2018

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Under vacuum Al-Mg alloy, liquids were successfully infiltrated into carbon/carbon (C/C) composites at high temperatures. Then, the mechanical properties, the metallographics, the scanning electron microscope images, the transmission electron microscope images, the X-ray diffraction images, and the energy dispersive spectroscopy results of C/C-Al-Mg composites were analyzed. The result showed that the bending property of C/C-Al-Mg composites reached 183 MPa whereas that of C/C composites totaled 165 MPa. The compressive strength of C/C-Al-Mg measured 206 MPa whereas that of C/C composites amounted to 142 MPa. The flexural strength and compressive strengths of the steeped metal sliders measured 121 and 104 MPa, respectively. The alloy liquid infiltrated into the matrix by forming a "network conduction" structure which reduced the resistivity and improved the conductivity of the composites. The resistivity of C/C-Al-Mg totaled 1.63 µΩm whereas that of C/C was 3.56 µΩm. During infiltration, an excellent wettability was observed between Al and the carbon matrix due to the existence of Al 4 C 3 . The friction coefficients of C/C, the steeped metal slide, and C/Al-Mg were 0.152, 0.068, and 0.189, respectively. The properties of C/C-Al-Mg composites meet the performance requirements of locomotive pantograph sliders.

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“…The modern technology requires materials with lighter weight, higher strength and superior mechanical properties. Copper metal matrix based composite material comprises high tensile strength, high melting temperature, light weight and good wear resistance [2].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Copper Graphite Composite Material

Singh¹

2017

IJMPERD

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Effect of the ratio of graphite/pitch coke on the mechanical and tribological properties of copper–carbon composites

Cited by 52 publications

References 18 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

Effect of Al–Mg Alloy Infiltration on Mechanical and Electrical Properties for Carbon/Carbon Composites

Fabrication and Characterization of Copper Graphite Composite Material

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