Wear Behavior of Copper Matrix Composites

Coupard, D.; Castro, Maysa C.; Coleto, J.; Garcı́a, Ana; Goñi, Javier; Palacios, Jordana K.

doi:10.4028/www.scientific.net/kem.127-131.1009

Cited by 9 publications

(10 citation statements)

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“…This suggests that under the present experimental conditions with tribosurface, shown by the dark area in Figure 7(b), which prevents the direct metal-to-metal contact and reduces fricincreasing applied load, an increase in the area of graphite film is more dominant than a decrease in the area of graphite tion. Similar findings were reported by Coupard et al [20] during their tests on copper-graphite composites against AISI film, due to the deformation of the matrix. The friction coefficient of the composite has been calcu-54100 steel at a sliding speed of 0.23 m/s in a reciprocating mode.…”

Section: E the Sem And Edx Analysissupporting

confidence: 89%

“…However, the surface of the copper-graphite pin appears smooth and seems to be covered with a dark matter, which is likely to be smeared graphite, as suggested by Coupard. [20] The EDX of the base-alloy and copper-graphite pins, after testing at an applied load of 88 N, is shown in Figure 8. The EDX analysis showed that much more iron is transferred to the surface of the base-alloy pins from the disk than the iron transferred to the surface of the coppergraphite pins; the surface of the base-alloy pin contained 77 wt pct Fe, as compared to 0.72 wt pct Fe on copper-graphite pins.…”

Section: Methodsmentioning

confidence: 99%

“…The presence of a graphitic tribolayer (transferred from the pin to the disk) on the disk nature of the wear debris ( Figure 11(b)). [20,25,26] Figure 15 shows the presence of cracks on the surface of the coppermasks the surface of the disk. The graphitic tribolayer on the counterface, acting as a solid lubricant, is likely to reduce graphite pins.…”

Section: E the Sem And Edx Analysismentioning

confidence: 98%

See 2 more Smart Citations

Friction and wear behavior of a centrifugally cast lead-free copper alloy containing graphite particles

Kestursatya

Kim²,

Rohatgi

2001

Metall Mater Trans A

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The tribological properties of a centrifugally cast lead-free copper alloy (C90300), containing an average of 13 vol pct graphite particles (5 m), have been studied. Friction tests were carried out at three different loads of 44, 88, and 176 N using a pin-on-disk testing method for the base copper alloy and the copper-graphite composite against a 1045 steel disk counterface. The friction coefficient, temperature rise, and weight loss of the pin and disk were measured. To understand the wear mechanism, the wear debris and the surfaces of the pin and the disk were analyzed before and after the tests, using scanning electron microscope (SEM) and energy-dispersive X-ray (EDX) analysis. The friction coefficient of the copper-graphite pins was lower than that of the base-alloy pins for all applied loads, which was attributed to the presence of the graphite in the matrix. It was also observed that the presence of graphite in the matrix reduces the transfer of iron from the counterface to the pins, but enhances the transfer of materials from the pins to the counterface. The temperature rise in the counterface running against the base-alloy pins was larger than the temperature rise in the counterface running against the copper-graphite pins, both tested under similar conditions. In addition, the effect of element transfer on the friction coefficient, variations in the weight of the pins and the counterface, as well as the surface roughness, are attributed to the formation of a graphitic tribolayer on the surface of the copper-graphite pins. An isostrain model predicting the friction coefficient of the composites is proposed, which agrees well with the measurements in the present article as well as with measurements made by other investigators. [10]

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Section: E the Sem And Edx Analysissupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: E the Sem And Edx Analysismentioning

confidence: 98%

See 1 more Smart Citation

Friction and wear behavior of a centrifugally cast lead-free copper alloy containing graphite particles

Kestursatya

Kim²,

Rohatgi

2001

Metall Mater Trans A

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“…6(b)), and thus decreasing the metal-to-hard Al 2 O 3 ball contact and the wear rate. Similar results were reported in copper-graphite composite 17,18) and aluminium-graphite composites. 19) In those works, the reduced friction due to the presence of graphite in the matrix was also reported.…”

Section: Wear Propertiessupporting

confidence: 90%

Effect of Carbon on Tensile Properties and Wear Behavior of P/M FeAl Alloy

Guan¹,

Zhu²,

Shibata³

et al. 2002

Mater. Trans.

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Powder metallurgy (P/M) .5C alloys (all compositions are in atomic percent) were produced by hot extrusion of gas-atomized powders to study the effect of carbon addition on microstructure, tensile properties and wear behavior of FeAl. Precipitation of soft graphite phase was observed in the carbon-added alloy. Tensile tests showed that the addition of carbon slightly increased yield strength at temperatures below 800 K, but significantly improved ductility, especially at elevated temperatures. The improvement in ductility was considered to be mainly due to the grain refinement in the carbon-added alloy. The wear behavior was studied by ball-on-disk sliding wear test. The carbon addition greatly improved the wear resistance of the Fe-40Al alloy at room temperature, but the effect was not significant at elevated temperatures. Examination of the worn surface and wear debris revealed that the improved wear resistance of the carbon-added alloy at room temperature was associated with the lubrication effect of graphite.

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“…Coupard et al [25] has determined the friction coefficient as approximately 0.7 at AISI-54100 steel against to CuSn12 bronze on pin-on-disc at 5 N load, 235 mm/s velocity and 30 min. In addition, friction coefficient and weight loss of bronze specimens are found to increase linearly when increasing the sliding velocity and load [25,26].…”

Section: Wear Propertiesmentioning

confidence: 99%