Dry sliding wear of sintered 6061 aluminium alloy— graphite particle composites

Jha, A. K.; Prasad, Somuri V.; Upadhyaya, G. S.

doi:10.1016/0301-679x(89)90147-3

Cited by 59 publications

(37 citation statements)

References 8 publications

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“…There have been many reports of a continuous graphite-rich layer forming on the contact surface during dry sliding as a result of shearing graphite particles which re-locate immediately under the sliding surface of the composite [11][12][13][14][15][16]. The lubricating layer is customarily regarded as a key contributor to the reduction in friction and wear because it prevents the direct contact of counterparts, plays a lubricating role, and decreases shear stress transmitted from the surface to the subsurface during sliding.…”

Section: Introductionmentioning

confidence: 98%

Effect of Sliding Speed on Surface Modification and Tribological Behavior of Copper–Graphite Composite

2010

Tribol Lett

114

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In practice, the sliding speed is an important parameter for materials applied in sliding condition. We have conducted an experimental study to explore the effect of sliding speed on friction and wear performance of a copper-graphite composite. The sliding tests were carried out over a wide range of speeds with a pin-on-disc configuration. The results show that there is a critical speed at which there is a transition of the friction and wear regimes of the composite. In addition, the formation of a lubricant layer on the contact surface (surface modification) determines the actual tribological performance of the composite. The wear mechanisms in different wear regimes are also discussed.

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Section: Introductionmentioning

confidence: 98%

Effect of Sliding Speed on Surface Modification and Tribological Behavior of Copper–Graphite Composite

2010

Tribol Lett

114

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“…Aluminum matrix composites containing graphite particles have the potential for light weight tribocomponents [23]. Graphite as a solid lubricant material improves seizure resistance of composites [2,3,12,[21][22][23][24][25][26][27]. However, the mechanism of film formation is not completely understood, and there are conflicting reports in the literature about the role of graphite on dry sliding wear.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, SiC, Al 2 O 3 , B 4 C, Si 3 N 4 , TiC, MoS 2 , and graphite are extensively used as the reinforcing particles in aluminum matrix composites [16][17][18][19][20][21][22]. Aluminum matrix composites containing graphite particles have the potential for light weight tribocomponents [23]. Graphite as a solid lubricant material improves seizure resistance of composites [2,3,12,[21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Graphite Content on the Tribological Behavior of Al/Gr and Al/30SiC/Gr Composites Processed by In Situ Powder Metallurgy (IPM) Method

2011

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The influence of graphite content on the dry sliding wear characteristics of Al6061/Gr composites along with Al6061/30SiC/Gr hybrid composites has been assessed using a pin-on-disc wear test. The composites with different volume fraction of graphite particles up to 13% were processed by in situ powder metallurgy (IPM) technique. The porosity and hardness of the resultant composites were also examined. It was found that an increase in the graphite content reduced the porosity, hardness, and friction coefficient of both types of composites. The hybrid composites were more porous and exhibited higher hardness and lower coefficient of friction at identical graphite contents. The increased graphite content in the range of 0-13 vol.% resulted in increased wear rate of Al/Gr composites. The Al/30SiC composite exhibited a lower wear rate as compared with the base alloy and graphite addition up to 9 vol.% improved the wear resistance of these hybrid composites. However, more graphite particles addition resulted in increased wear rate. SEM micrographs revealed that the wear mechanism was changed from mostly adhesive in the base alloy sample (Al/0Gr) to the prominently abrasive and delamination wear for Al/Gr and Al/SiC/Gr/ composites.

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“…However, their low resistance to wear under poor lubricating conditions and their severe seizure and galling under boundary lubrication conditions are major concerns for their use in high-performance tribological applications. With solid lubricant particle dispersion in the matrix of an aluminum alloy, this material can exhibit improved wear resistance and consequently become more suitable for high-performance tribological applications [54,55]. Considerable efforts have focused on incorporating solid lubricating particles in aluminum alloy matrices to improve friction, wear, and anti-seizing properties.…”

Section: Self-lubricating Behavior Of Aluminum-graphite Compositesmentioning

confidence: 98%

Self-Lubricating Behavior of Graphite-Reinforced Composites

Menezes

Reeves

Rohatgi

et al. 2013

Tribology for Scientists and Engineers

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Lubricants are extensively used between contacting surfaces to reduce friction and wear. Typically, liquid lubricants are used to achieve low friction and wear. However, these lubricants are not effective in elevated temperature applications or vacuum environments. For these reasons, solid lubricants are utilized to meet these operational needs, where liquid lubrication is impractical. Solid lubricants are only effective as long as they are present in the tribo-interface. Therefore, it is desirable to provide a constant supply of solid lubricant material to the contacting surface. This is often achieved by incorporating solid lubricants as a second phase in the base material. These composite materials have the ability to achieve low friction and wear at the contact surfaces without any external supply of lubrication during sliding. Metal matrix composites reinforced with lamellar solid lubricant particles such as graphite are being used as self-lubricating materials for various engineering applications. In this chapter, the tribological behavior of metal and ceramic matrix composites reinforced with graphite particles has been reviewed. More specifically, copper-graphite, nickel-graphite, magnesiumgraphite, silver-graphite, aluminum-graphite, silicon nitride-graphite, and alumina-graphite composites are studied. The influence of various environmental and mechanical parameters on the friction coefficient and wear rate is discussed. It was found that the amount of graphite released on the worn surface forms a thin transfer film on the contact surfaces. This transfer film reduces the overall friction coefficient and wear rate. The presence of the graphite-based transfer film increases the seizure resistance and enables the contacting surfaces to run under boundary lubrication without galling. The formation and retention of this transfer film on the sliding surface as well as its composition, area fraction, thickness, and hardness are important factors in controlling the friction and wear behavior of the material. The effectiveness of the transfer film also depends on the nature of the sliding surface, the test condition, environment, and the graphite content in the composite.

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Dry sliding wear of sintered 6061 aluminium alloy— graphite particle composites

Cited by 59 publications

References 8 publications

Effect of Sliding Speed on Surface Modification and Tribological Behavior of Copper–Graphite Composite

Effect of Sliding Speed on Surface Modification and Tribological Behavior of Copper–Graphite Composite

Effect of the Graphite Content on the Tribological Behavior of Al/Gr and Al/30SiC/Gr Composites Processed by In Situ Powder Metallurgy (IPM) Method

Self-Lubricating Behavior of Graphite-Reinforced Composites

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