Research on synergistic lubrication effect of silver modified Cu–Ni-graphite composite

Gao, Yimin; Li, Yefei; Li, Mengting; Sun, L.; Zhai, Wenyan; Li, Kemin

doi:10.1016/j.wear.2019.203140

Cited by 20 publications

(9 citation statements)

References 25 publications

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“…During the mutual friction between the composite surface and the counter-abrasive parts, the copper-plated layer can play a role of protecting the graphite, so that the graphite on the contact surface is not extruded, but it can form a continuous and constantly replenished lubrication mechanism, which can effectively enhance the friction coefficient of the composite [26] .As indicated in Table 1, average friction coefficient of the copper-coated C/Cu composites prepared in this work and other literature [27][28][29][30][31] . Cf/Cu/C composites 0.26 [27] Cu-graphite-Cr3C2 Composites(Air) 0.4644 [28] Ti2SnC-copper/graphite 0.15 [3] foam copper-copper/graphite(60%graphite) 0.162 [29] Ag-Cu-Ni-graphite(1wt%graphite) 0.183 [30] Cu-Ni-graphite(1wt%graphite) The three-dimensional profile analysis of the wear scar morphology of copper-plated C/Cu composites with different graphite contents is shown in Figure 14. From the Figure 14, the width and depth of the abrasion marks of copper-plated C/Cu composites with different graphite contents can be observed, and the data corresponding to the width and depth of the abrasion marks were obtained after Origin fitting as shown in Table 2.…”

Section: Friction and Wear Analysismentioning

confidence: 70%

Study on the microstructure and properties of copper/graphite composites with two-step method and copper-modified graphite

Ding,

Gao,

Han

et al. 2023

J. Phys.: Conf. Ser.

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In this experiment, copper was coated on the surface of graphite by chemical process. Besides, the microstructure and crystal structure of copper-coated graphite were characterized by SEM and XRD. Copper-plated C/Cu composite was prepared by SPS sintering technique of powder mixture by two-step method. In order to test the dispersion state of graphite in the composites and the phenomenon of interfacial dispersion, the effect of graphite content on the properties of copper-coated C/Cu composites was also an important point. Therefore, the microscopic characterization and performance test were carried out. The results show that magnetic stirring and high-energy ball milling ensure the uniformity of copper-coated graphite in copper matrix, and conducted structural grain refining. The grain size of copper, and the properties of composite materials decreased with the increase of graphite content, such as relative density, conductivity and hardness. However, the further increase of graphite content leads to excessive grain size, the relatively long time of ball milling makes the fine grain become larger after sintering. When the graphite content is 1.0wt.%, the relative density, conductivity and hardness are 99.91%, 92.1%IACS and 67.7 HV, respectively. It is proved that copper-coated graphite and two-step powder mixing play an important role on improving the properties of the composites.

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Section: Friction and Wear Analysismentioning

confidence: 70%

Study on the microstructure and properties of copper/graphite composites with two-step method and copper-modified graphite

Ding,

Gao,

Han

et al. 2023

J. Phys.: Conf. Ser.

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“…However, at elevated temperatures, the mechanisms were suppressed significantly. Several other studies [ 65 , 66 , 67 ] discuss the synergetic effect of lubrication of graphite and other solid lubricants. However, a good explanation regarding the occurring synergetic wear mechanisms at HT is scarcely reported.…”

Section: Potential High-temperature Solid-lubricantsmentioning

confidence: 99%

Solid Lubrication at High-Temperatures—A Review

et al. 2022

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Understanding the complex nature of wear behavior of materials at high-temperature is of fundamental importance for several engineering applications, including metal processing (cutting, forming, forging), internal combustion engines, etc. At high temperatures (up to 1000 °C), the material removal is majorly governed by the changes in surface reactivity and wear mechanisms. The use of lubricants to minimize friction, wear and flash temperature to prevent seizing is a common approach in engine tribology. However, the degradation of conventional liquid-based lubricants at temperatures beyond 300 °C, in addition to its harmful effects on human and environmental health, is deeply concerning. Solid lubricants are a group of compounds exploiting the benefit of wear diminishing mechanisms over a wide range of operating temperatures. The materials incorporated with solid lubricants are herein called ‘self-lubricating’ materials. Moreover, the possibility to omit the use of conventional liquid-based lubricants is perceived. The objective of the present paper is to review the current state-of-the-art in solid-lubricating materials operating under dry wear conditions. By opening with a brief summary of the understanding of solid lubrication at a high temperature, the article initially describes the recent developments in the field. The mechanisms of formation and the nature of tribo-films (or layers) during high-temperature wear are discussed in detail. The trends and ways of further development of the solid-lubricating materials and their future evolutions are identified.

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“…Numerous studies have shown that the tribological properties of self‐lubricating composites are related to the interfacial bonding strength between lubricating particles and the matrix; the volume fraction, spatial distribution and particle size of lubricating particles are also key factors that affect the tribological properties of materials 12–19 . Therefore, in the preparation of Pb‐free FCB composites, the various contents of FeS and Bi inevitably lead to different tribological properties.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have shown that the tribological properties of self-lubricating composites are related to the interfacial bonding strength between lubricating particles and the matrix; the volume fraction, spatial distribution and particle size of lubricating particles are also key factors that affect the tribological properties of materials. [12][13][14][15][16][17][18][19] Therefore, in the preparation of Pb-free FCB composites, the various contents of FeS and Bi inevitably lead to different tribological properties. Ball milling can reduce the size of lubricating particles, improve the interface between lubricating particles and the matrix, and enhance the uniform distribution of FeS and Bi phases in the material to regulate the tribological properties of the material.…”

Section: Introductionmentioning

confidence: 99%

Tribological performance optimization and synergistic lubrication evolution of Pb‐free FeS/Cu–Bi composites

Tong

Yin

et al. 2022

Lubrication Science

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The tribological properties of Pb-free FeS/Cu-Bi (FCB) self-lubricating composites were optimised with the Taguchi method. The effects of lubricant content and ball milling time on the anti-friction and wear resistance of FCB composites were investigated. Then the evolution of the friction interface was observed through interrupted microscopy measurement to reveal its synergistic lubrication mechanism. The results showed that the primary and secondary factors that affected the anti-friction and wear resistance of the FCB composites were FeS content, Bi content and ball milling time. The synergistic lubrication mechanism of FCB composites was that FeS could prevent the crack from extending with the continuous Bi mesh and could prevent the matrix with Bi debris from peeling off, which was conducive to the formation of a lubricantrich tribofilm at the friction interface to improve the tribological properties of the composites.

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Research on synergistic lubrication effect of silver modified Cu–Ni-graphite composite

Cited by 20 publications

References 25 publications

Study on the microstructure and properties of copper/graphite composites with two-step method and copper-modified graphite

Study on the microstructure and properties of copper/graphite composites with two-step method and copper-modified graphite

Solid Lubrication at High-Temperatures—A Review

Tribological performance optimization and synergistic lubrication evolution of Pb‐free FeS/Cu–Bi composites

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