Influence of the fiber orientation on 3D C/C–SiC composite material and its formation mechanism of the machining surface

Li, Wei; Long, Gui; Shi, Feng; Zhou, Shenlei; Yin, Juan; Yang, Jianxiao

doi:10.1007/s00170-021-08149-1

Cited by 20 publications

(4 citation statements)

References 44 publications

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“…Figure10shows the residual stresses of the graphite, Si, and SiC phases on the worn surface of siliconized graphite rings under the applied loads of 500-1500 N with spindle speeds of 100-5000 rpm in 25 °C and 90 °C water, respectively. Residual compressive stress presents itself on the original surfaces of all the C, Si, and SiC phases, which is consistent with that by grinding[26]. The residual stress of C on the worn surface under all conditions is similar to that of the original with an average value of around −4 MPa.For the original siliconized graphite rings, Si has a residual stress of −33.1 MPa and SiC of −49.2 MPa.…”

supporting

confidence: 80%

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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supporting

confidence: 80%

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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“…16,17 There are many factors affecting the properties of the C/C-SiC composite prepared by the RMI method, including the structure of the porous C/C preform, infiltration time, infiltration temperature, and so forth. 8,[18][19][20][21][22][23][24] For instance, the mechanical properties and microstructure of the C/C-SiC composite are largely affected by the structure of the porous C/C preform, including the woven structure of the carbon-fiber felt, the density of the C/C preform, the structure of pyrolytic carbon (PyC), and heat treatment (HT) state. In past research, Wang et al 8 studied the effect of bulk density of the C/C preform on the flexural strength of the C/C-SiC composite.…”

Section: Introductionmentioning

confidence: 99%

Effects of density and heat treatment of C/C preforms on microstructure and mechanical properties of C/C–SiC composites

Wang

Wen

et al. 2022

Int J Applied Ceramic Tech

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Twill multidirectional carbon-fiber-reinforced carbon and silicon carbide composites (i.e., C/C-SiC) were prepared via chemical vapor infiltration combined with reactive melt infiltration process. The effect of heat treatment (HT) on the microstructure and mechanical properties of C/C-SiC composites obtained by C/C preforms with different densities was thoroughly investigated. The results show that as the bulk density of C/C preforms increases, the thickness of the pyrolytic carbon (PyC) layer increases and open pore size distribution narrows, making the bulk density and residual silicon content of C/C-SiC composites decrease. Moreover, the flexural strength and tensile strength of the C/C-SiC composites were improved, which can be attributed to the increased thickness of the PyC layer. The compressive strength reduces due to the decrease of the ceramic phase content. HT improves the graphitization degree of PyC, which reduces the silicon-carbon reaction rate and thereby the content of the SiC phase. HT induces microcracks and porosity but not obviously affects the mechanical properties of C/C-SiC composites. However, the negative impact of HT can be compensated by the increased density of the C/C preforms.

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“…The results showed that abrasive wear and elastic deformation in the grinding process of silicon carbide are the main reasons why the actual machining depth is much lower than the preset machining depth of nano-scale. Li et al [18] studied the grinding machinability of 3D C/ C-sic composites, and conducted grinding experiments of 3D C/ C-sic composites with resin bonded diamond grinding wheel. The results showed that the main removal of C/ C-sic composites is considered as a brittle fracture mode.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Analysis of Subsurface Brittleness Mechanism of Nanocrystalline 3C-SiC Rough Friction Surface

Ning,

Wu,

Zhang

et al. 2024

Preprint

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To study the effect of polycrystalline 3C-SiC rough friction surface on the mechanism of subsurface brittleness during nanocrystalline grinding. The mechanism of subsurface brittleness in the nano-grinding process of polycrystalline 3C-SiC friction surface is analyzed by molecular dynamics method. Combined with the characteristics of polycrystalline grains constructed by Voronoi method, the initial grinding model of rough friction surface polycrystalline 3C-SiC and diamond abrasive particles is constructed. The processing mechanism of 3C-SiC is analyzed by post-processing methods such as dislocation defect analysis, atomic arrangement analysis and stress analysis. At 2.6nm, "stress concentration" occurs between the abrasive particles and the workpiece, forming a "heart-shaped" force shape. The larger the grain size, the smaller the crystal hardness, the greater the possibility of crystal fracture, and it is obvious in the larger crystal size, crystal fracture and vacancy at 8nm. The results show that the rough friction surface of polycrystalline 3C-SiC helps to reduce the damage deformation of the subsurface, and the crossing mechanism between grain and grain boundary can also effectively improve the damage of the subsurface.

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Influence of the fiber orientation on 3D C/C–SiC composite material and its formation mechanism of the machining surface

Cited by 20 publications

References 44 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

Effects of density and heat treatment of C/C preforms on microstructure and mechanical properties of C/C–SiC composites

Molecular Dynamics Analysis of Subsurface Brittleness Mechanism of Nanocrystalline 3C-SiC Rough Friction Surface

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