The tribological properties and mechanism of wear of Cu-based sintered powder materials containing molybdenum disulfide and molybdenum diselenite under unlubricated sliding against copper

Kovalchenko, Andriy; Фущич, О. И.; Danyluk, S.

doi:10.1016/j.wear.2012.05.001

Cited by 120 publications

(36 citation statements)

References 39 publications

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“…The average coefficients of friction of the samples decreased with increasing MoS 2 concentration r, and became constant (~0.20) above 5.0 vol.% MoS 2 . The coefficients of friction of the Cu-based MoS 2 -dispersed composite that was formed by sintering were ~0.20 [4,5], and the coefficient of friction of the MoS 2 against itself in air was also 0.20 [21]. From these results, it appears that the Cu/MoS 2 composite material with a 5.0 vol.% or larger amount of MoS 2 as formed by COSME-RT ensures sufficient lubrication of the MoS 2 .…”

Section: Composition and Microstructuresmentioning

confidence: 82%

“…The indentation hardness of the r = 0, 1.0, and 5.0 vol.% samples was more than 1.6 GPa, and higher than that of a pure Cu plate (1.0 GPa). The indentation hardness was ~1.5 times higher than that of the Cu-based MoS 2 -dispersed composite that was formed by sintering when converted to a Vickers or Rockwell hardness [4,5]. The indentation hardness of the samples decreased with increasing MoS 2 concentration r, and the amount of host matrix (Cu) that retains the composite structure decreased.…”

Section: Composition and Microstructuresmentioning

confidence: 93%

“…Nevertheless, temperatures during powdermetallurgy processes are higher than the reaction temperatures of the original materials for metal-based solid lubricant-dispersed self-lubricating composites such as Cu/MoS 2 [3,4]. These composites are expected to have the high strength of the metal-host matrix and the low friction coefficient of solid lubricants.…”

Section: Introductionmentioning

confidence: 99%

“…In this structure, the metal-based solid lubricantdispersed composite is expected to maintain a low friction coefficient as a result of the lubricants, even when worn. However, when formed by powder metallurgy, the composite material loses its mechanical strength and tribological properties by generating brittle compounds with no lubrication property, such as CuMo 2 S 3 [3,4]. Therefore, a method for forming composites at a lower temperature than the reaction temperatures of the original materials is required.…”

Section: Introductionmentioning

confidence: 99%

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Cu-Based MoS<sub>2</sub>-Dispersed Composite Material Formed by the Compression Shearing Method at Room Temperature

et al. 2017

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Cu/MoS 2 composite material was formed by a novel powder-molding technique, which is termed the compression shearing method at room temperature (COSME-RT). Cu/MoS 2 sample mechanical and tribological properties and microstructures were investigated. Samples were prepared using five different MoS 2 concentrations between 0 to 20 vol.%. No unwanted compounds were generated by the Cu and MoS 2 because a high temperature is unnecessary in COSME-RT. Scanning electron microscopy observations confirmed that the MoS 2 particles were dispersed homogeneously in the Cu host matrix. The indentation hardness of Cu/MoS 2 with 0, 1.0 and 5.0 vol.% MoS 2 was higher than 1.6 GPa, and is higher than that formed by conventional powder metallurgy methods and a pure Cu plate. The indentation hardness of the Cu/MoS 2 decreased with increasing MoS 2 concentration. In contrast, the lubricating performance of MoS 2 became more pronounced at 5.0 vol.% or above. The coefficient of friction of Cu/MoS 2 with 5.0, 10 and 20 vol.% MoS 2 was ~0.20, and is the same as for MoS 2 in air. The sample coefficient of friction was maintained because of lubrication by forming a transferred film of wear debris that contained MoS 2 . Cu/MoS 2 had a low coefficient of friction, but maintained its material strength at 5.0 vol.% MoS 2 .

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Section: Composition and Microstructuresmentioning

confidence: 82%

Section: Composition and Microstructuresmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cu-Based MoS<sub>2</sub>-Dispersed Composite Material Formed by the Compression Shearing Method at Room Temperature

et al. 2017

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“…SiO 2 , Cr and other particles are broken under the strong impact of friction force, and embedded in the high temperature softening matrix to reduce the role of ploughing and the mechanical meshing force. At the same time, the lubricating film on the friction surface is peeling off, the material is directly contacted with the friction pair, so the friction coefficient is reduced [13]. The friction surface topography of the material shows that the abrasive wear occurs during the friction process.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Effect of Speed on Friction and Wear Properties of Cu-based Material

Pei¹,

Duan²,

Gong³

et al. 2017

Proceedings of the 2017 International Conference on Material Science, Energy and Environmental Engineering (MSEEE 2017)

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Abstract. According to the performance requirements of brake friction plate in the high speed train, Cu-based friction material was prepared by powder metallurgy technology. The friction components are mainly atomized Fe, a small amount of Cr and SiO2. And a high coefficient is caused by the friction resistance of these particles in the friction surface. The graphite forms a layer of solid lubricating film on the friction surface to ensure a stable friction coefficient under the all kinds of friction conditions. The compressive strength of sintered samples were tested by DDL50 Electronic Universal Testing Machine, and the property of dry friction and wear were tested by vertical universal friction-wear testing machine. The wearing morphologies were observed by SEM and the effects of friction speed on wear rate and friction coefficient were analyzed. The result shows that Cu-based containing larger natural flake graphite and smaller Fe particles has good friction wear performance. And when the load varying from 50N to 150N at the speed of 600r/min, the friction coefficient is about 0.4~0.48, the coefficient varies little and is very stable. The main wear mechanisms are abrasive wear and oxidation wear.

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