Preparation and characterization of lightweight SiC frameworks by connecting SiC fibers with SiC joints

Zhang, Nan–Long; Deng, Yuchen; Hou, Baoqiang; Zhi, Qiang; Cheng, H. S.; Yang, Jianfeng; Wang, Bo; Wang, Wei

doi:10.1016/j.ceramint.2022.01.066

Cited by 7 publications

(3 citation statements)

References 54 publications

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“…3C-SiC has good natural sphericity and self-sharpening, excellent creep resistance and fracture resistance, good sintering activity, large gap width and other excellent properties, and is widely used in aerospace precision fields such as high temperature, high pressure and high magnetic field [1][2][3] . Its high hardness and brittleness make it very easy for 3C-SiC to have cracks, point and line defects and other major forms of processing damage in the process of processing [4][5][6] , which reduces the stability of 3C-SiC materials in the process of use and greatly limits the development and application of 3C-SiC in the high-precision field.…”

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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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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“…Recently, the chemical vapor infiltration (CVI) technique was applied to weld the interfaces of SiC fiber (SiCF) mats by in situ generating a CVI-SiC solder at a relatively low temperature far below SiC's sintering temperature, which greatly strengthened the interfacial bonding of adjacent SiCFs. 37 This technique makes CVI-SiC an easily obtained solder for reducing the ITR of filler−filler interfaces. From the aforementioned experimental results, the highly thermally conductive solders have been proved to be able to greatly reduce the ITR between adjacent fillers and improve composites' TC.…”

mentioning

confidence: 99%

“…A better way to weld fillers is still needed. Recently, the chemical vapor infiltration (CVI) technique was applied to weld the interfaces of SiC fiber (SiCF) mats by in situ generating a CVI-SiC solder at a relatively low temperature far below SiC’s sintering temperature, which greatly strengthened the interfacial bonding of adjacent SiCFs . This technique makes CVI-SiC an easily obtained solder for reducing the ITR of filler–filler interfaces.…”

mentioning

confidence: 99%

Effect of Nanoscale in Situ Interface Welding on the Macroscale Thermal Conductivity of Insulating Epoxy Composites: A Multiscale Simulation Investigation

Ding,

Huang,

Peng

et al. 2023

ACS Nano

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Insulating thermally conductive polymer composites are in great demand in integrated-circuit packages, for efficient heat dissipation and to alleviative short-circuit risk. Herein, the continuous oriented hexagonal boron nitride (h-BN) frameworks (o-BN@SiC) were prepared via self-assembly and in situ chemical vapor infiltration (CVI) interface welding. The insulating o-BN@SiC/epoxy (o-BN@SiC/EP) composites exhibited enhanced thermal conductivity benefited from the CVI-SiC-welded BN–BN interface. Further, multiscale simulation, combining first-principles calculation, Monte Carlo simulation, and finite-element simulation, was performed to quantitatively reveal the effect of the welded BN–BN interface on the heat transfer of o-BN@SiC/EP composites. Phonon transmission in solders and phonon–phonon coupling of filler–solder interfaces enhanced the interfacial heat transfer between adjacent h-BN microplatelets, and the interfacial thermal resistance of the dominant BN–BN interface was decreased to only 3.83 nK·m2/W from 400 nK·m2/W, plunging by over 99%. This highly weakened interfacial thermal resistance greatly improved the heat transfer along thermal pathways and resulted in a 26% thermal conductivity enhancement of o-BN@SiC/EP composites, compared with physically contacted oriented h-BN/EP composites, at 15 vol % h-BN. This systematic multiscale simulation broke through the barrier of revealing the heat transfer mechanism of polymer composites from the nanoscale to the macroscale, which provided rational cognition about the effect of the interfacial thermal resistance between fillers on the thermal conductivity of polymer composites.

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SiC ceramic mirror fabricated by additive manufacturing with material extrusion and laser cladding

Li¹,

Ma²,

Chen³

et al. 2022

Additive Manufacturing

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Preparation and characterization of lightweight SiC frameworks by connecting SiC fibers with SiC joints

Cited by 7 publications

References 54 publications

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

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

Effect of Nanoscale in Situ Interface Welding on the Macroscale Thermal Conductivity of Insulating Epoxy Composites: A Multiscale Simulation Investigation

SiC ceramic mirror fabricated by additive manufacturing with material extrusion and laser cladding

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