Reciprocating friction and wear properties of mesocarbon microbeads-based graphite and siliconized graphite

Xia, Hongyan; Wang, Jiping; Shi, Zhongqi; Qiao, Guanjun

doi:10.1016/j.jnucmat.2012.09.016

Cited by 8 publications

(9 citation statements)

References 13 publications

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“…The MCMBs were regular spheres. From the high magnification picture (Figure 1b), every sphere was assembled with many flaky components which, according to previous reports, are flaky aromatic molecules [20,25].…”

Section: Resultsmentioning

confidence: 85%

Microstructure and Tribological Performance of Mesocarbon Microbead–Silicon Carbide Composites

et al. 2019

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Mesocarbon microbead–silicon carbide (MCMB–SiC) composites with 0–30 wt % MCMBs were prepared by pressureless sintering (PLS) method at 2200 °C in Ar. The microstructure and tribological properties of the prepared composites were investigated. The results show that there was a finer grain size of SiC with the increase in MCMB content because MCMBs hinder the growth of SiC grains. The hardness of the composites decreased with increasing MCMB content, whereas the fracture toughness fluctuated showing a complex trend. The tribological properties of the composites under dry friction conditions were evaluated using the pin-on-disk method against a SiC counterpart. We found that the tribological properties of the samples were influenced by the oxide film or lubricating film that formed during the wear process on wear surfaces. Different wear mechanisms were found to be associated with differing MCMB contents.

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Section: Resultsmentioning

confidence: 85%

Microstructure and Tribological Performance of Mesocarbon Microbead–Silicon Carbide Composites

et al. 2019

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“…Compared with the thrust bearing materials of polymers [10,11], composites [12,13], and ceramics [14,15], etc., the tribological behaviors of siliconized graphite under water lubrication is more complex, due to its multi-phase structure and microstructure. Xia et al [16] found that the ploughing wear of siliconized graphite is mainly a dry wear mechanism coupled with abrasive and adhesive wear, resulting in a lower wear rate but in a higher coefficient of friction (COF). Subsequently, Xue et al [17] observed the abrasive wear mechanism of siliconized graphite under boundary lubrication in ambient water.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature and High-Pressure Tribological Properties of Siliconized Graphite for Water-Lubricated Thrust Bearing Application in Main Coolant Pump

Liu,

Zhang,

Cai

et al. 2024

Lubricants

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The effect of the microstructure of siliconized graphite on tribological properties is investigated by using a high-temperature and high-pressure water-lubricated tribometer on a self-mated ring-on-ring configuration under an applied load of 500–1500 N with a spindle speed of 100–5000 rpm in both 90 °C (5 MPa) and 25 °C (1 MPa) water environments, respectively. The Stribeck curves measurement and continuous wear tests are performed and analyzed in both water environments. The wear behaviors of the graphite, SiC, and free-silicon phases in siliconized graphite are demonstrated to explore the wear mechanism. The larger wear depths of a low-worn surface roughness on the three phases contribute to the boundary lubrication. The shallower wear depths are observed on the SiC and Si phases under the mixed lubrication, corresponding to partial contact wear of surface asperities. The wavy surface of the SiC phase and uniform flow-oriented striae of the Si phase are attributed to hydrodynamic lubrication, caused by full water film scouring the worn surface. Finally, an integrated evaluation method of G duty parameters is successfully used to identify the lubrication regimes of siliconized graphite from the boundary, mixed, to hydrodynamic lubrications for a water-lubricated thrust bearing application in the main coolant pump of a nuclear power plant.

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“…The graphite/SiC composites, which matrix contains a certain content of SiC phase and carbon phase, have excellent properties derived from both graphite and SiC, and have been widely used as self-lubricating composites for chemical, metallurgy, aerospace, and nuclear industries, more particularly for mechanical seals, bearings, and refractories. 1,2 Reactive melt infiltration (RMI) due to near net shape fabrication and short processing period 3,4 is an attractive method for fabricating the graphite/SiC composites with ideal shape, size, and very low porosity at low cost. 5 The infiltration of liquid silicon into porous carbon preforms is extremely rapid regarding the driving force of reactive wetting and capillary force.…”

Section: Introductionmentioning

confidence: 99%

“…The graphite/SiC composites with high retained carbon content are indispensable for excellent selflubricating properties, high thermal stability, and thermal conductivity. 1,[8][9][10] In order to retain higher carbon content of the composites after RMI process, several approaches have been employed for preventing the direct contact with liquid silicon or reducing the severity of reaction with silicon at high temperature. 4,[11][12][13][14] Some researchers fabricated the pyrolytic carbon coating on the surface of inorganic material via chemical vapor deposition, 11 polymer coating pyrolysis, 4,12,14 or hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

“…The graphite/SiC composites with high retained carbon content are indispensable for excellent self‐lubricating properties, high thermal stability, and thermal conductivity 1,8–10 . In order to retain higher carbon content of the composites after RMI process, several approaches have been employed for preventing the direct contact with liquid silicon or reducing the severity of reaction with silicon at high temperature 4,11–14 .…”

Section: Introductionmentioning

confidence: 99%

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A hybrid graphite powder PFC@G for reserving higher carbon content of self‐lubrication graphite/SiC composites by RMI

et al. 2023

Self Cite

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The appropriate carbon content is indispensable for the application of selflubricating graphite/SiC composites. However, it is a big challenge to retain high carbon content in the reaction-formed graphite/SiC composites because of drastic consumption of carbon by violent reaction with liquid silicon. In this study, a hybrid powder constructed by graphite particles (G) and glassy carbon derived from phenolic resin (PFC) was used as carbon sources, or PFC@G for short, to reserve higher content of carbon in the reaction-formed composites. The weight ratio of phenolic resin to graphite particles was adjusted to obtain an appropriate PFC@G with dense microstructure and close-grained surface. Compared with the graphite/SiC composites only using raw graphite particles as carbon sources, the carbon content of the composites fabricated with compact and large PFC@G has obviously increased (up to 172%). In particular, the carbon content of the composites fabricated with the weight ratio = 0.8 reached a high value of 44.26 vol.%, which exhibited outstanding self-lubrication properties among the four kinds of the composites. The mechanism of reserving higher content of carbon in the graphite/SiC composites by constructing PFC@G is investigated, revealing that a continuous SiC layer formed on the surface of the larger size PFC@G and most closely packed graphite particles inside of PFC@G were insulate from liquid silicon by the layer.

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Reciprocating friction and wear properties of mesocarbon microbeads-based graphite and siliconized graphite

Cited by 8 publications

References 13 publications

Microstructure and Tribological Performance of Mesocarbon Microbead–Silicon Carbide Composites

Microstructure and Tribological Performance of Mesocarbon Microbead–Silicon Carbide Composites

High-Temperature and High-Pressure Tribological Properties of Siliconized Graphite for Water-Lubricated Thrust Bearing Application in Main Coolant Pump

A hybrid graphite powder PFC@G for reserving higher carbon content of self‐lubrication graphite/SiC composites by RMI

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