Enhancement of tribological properties in siliconized graphite via hierarchically hybrid SiC/C composite

Li, Fulin; Zhu, Zhaowei; Yu, Xianglong; Li, Kai; Wang, Zixi; Zhang, Zezhao; Wang, Yuming

doi:10.1016/j.pnsc.2020.12.014

Cited by 2 publications

(5 citation statements)

References 30 publications

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“…The graphite particles disperse on the surface acting as a solid lubricant, which can stabilize wear after a stable friction film has formed on the worn surface [28]. However, the Si dispersed on the surface has a limited role in the abrasive wear [18]. The structural characteristics of SiC as the bone along with the self-lubricating graphite particles dispersed on the surface [29] ensure that the siliconized graphite maintains a relatively low wear depth of 0.97 µm compared to that of the other bearing materials [10][11][12][13].…”

Section: Lubrication Regimes In High-temperature and High-pressure Watermentioning

confidence: 99%

“…Note that the wear depth of 0.18 µm obtained under 1100 N with 2000 rpm in 90 • C water in the slope of −0.06 indicates that the lubricated regimes of siliconized graphite are not unique at a G value. Since the lubrication regime is a non-transient transition from the boundary, mixed, to hydrodynamic lubrications, it is possible to correspond simultaneously to boundary and mixed lubrications or mixed and hydrodynamic lubrications within a certain interval of the same G determined by different temperature, pressure, loads, and speeds [16][17][18]. And the exact lubrication regime is figured out by means of sloping segments.…”

Section: Integrated Evaluation By G Duty Parametersmentioning

confidence: 99%

“…Subsequently, Xue et al [17] observed the abrasive wear mechanism of siliconized graphite under boundary lubrication in ambient water. Li et al [18] compared the two tribological types of siliconized graphite in ambient water and pointed out the content ratio leading to the different wear mechanisms. Yuan et al [19] found that water lubrication decreases the friction and wear of SiC mainly by the formation of a SiO 2 tribo-layer, whereas the graphene lubricant reduces the COF.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Lubrication Regimes In High-temperature and High-pressure Watermentioning

confidence: 99%

Section: Integrated Evaluation By G Duty Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…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%

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

et al. 2023

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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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Enhancement of tribological properties in siliconized graphite via hierarchically hybrid SiC/C composite

Cited by 2 publications

References 30 publications

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

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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