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Journal of Advanced Ceramics 2024, 13(2): 255-262 https://doi.org/10.26599/JAC.2024.9220849
Research Article | Open Access | Issue | Published: 22 February 2024

Top priority current path between SiC particles during ultra-high temperature flash sintering: Presence of PyC “bridges”

Show Author's Information Le Lu1,†,  Tianlong Liu1,†,  Zhaofeng Chen1( ),  Fei Wang1,  Mengmeng Yang1,  Qiong Wu1,  Lixia Yang1( ),  Huanyong Li2
International Laboratory for Insulation and Energy Efficiency Materials, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
State Key Laboratory of Solidification Processing, School of Materials and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

† Le Lu and Tianlong Liu contributed equally to this work.

Keywords:
silicon carbide (SiC), flash sintering (FS), current path, instantaneous, pyrolytic carbon (PyC) "bridges"
Cite this article:
Lu L, Liu T, Chen Z, et al. Top priority current path between SiC particles during ultra-high temperature flash sintering: Presence of PyC “bridges”. Journal of Advanced Ceramics, 2024, 13(2): 255-262. https://doi.org/10.26599/JAC.2024.9220849
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Abstract Full text Electronic supplementary material About this article

Flash sintering (FS) is a novel technique for rapidly densifying silicon carbide (SiC) ceramics. This work achieved a rapid sintering of SiC ceramics by the utilization of ultra-high temperature flash sintering within 60 s. Pyrolysis carbon (PyC) “bridges” were constructed between SiC particles through the carbonisation of phenolic resin, providing a large number of current channels. The incubation time of the flash sintering process was significantly reduced, and the sintering difference between the centre and the edge regions of the ceramics was minimized, with an average particle size of the centre region and edge region being 12.31 and 9.02 μm, respectively. The results showed that the porosity of the SiC ceramics after the flash sintering was reduced to 14.79% with PyC “bridges” introduced, and the Vickers hardness reached 19.62 GPa. PyC “bridges” gradually evolved from amorphous eddy current carbon to oriented graphite carbon, indicating that the ultra-high temperature environment in which the sample was located during the flash sintering was successfully constructed. Ultra-high temperature flash sintering of SiC is expected to be applied to the local repair of matrix damage in SiC ceramic matrix composites.


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About this article

Top priority current path between SiC particles during ultra-high temperature flash sintering: Presence of PyC “bridges”

Show Author's information Le Lu1,†, Tianlong Liu1,†, Zhaofeng Chen1( ), Fei Wang1, Mengmeng Yang1, Qiong Wu1, Lixia Yang1( ), Huanyong Li2
International Laboratory for Insulation and Energy Efficiency Materials, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
State Key Laboratory of Solidification Processing, School of Materials and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

† Le Lu and Tianlong Liu contributed equally to this work.

Abstract

Flash sintering (FS) is a novel technique for rapidly densifying silicon carbide (SiC) ceramics. This work achieved a rapid sintering of SiC ceramics by the utilization of ultra-high temperature flash sintering within 60 s. Pyrolysis carbon (PyC) “bridges” were constructed between SiC particles through the carbonisation of phenolic resin, providing a large number of current channels. The incubation time of the flash sintering process was significantly reduced, and the sintering difference between the centre and the edge regions of the ceramics was minimized, with an average particle size of the centre region and edge region being 12.31 and 9.02 μm, respectively. The results showed that the porosity of the SiC ceramics after the flash sintering was reduced to 14.79% with PyC “bridges” introduced, and the Vickers hardness reached 19.62 GPa. PyC “bridges” gradually evolved from amorphous eddy current carbon to oriented graphite carbon, indicating that the ultra-high temperature environment in which the sample was located during the flash sintering was successfully constructed. Ultra-high temperature flash sintering of SiC is expected to be applied to the local repair of matrix damage in SiC ceramic matrix composites.

Keywords: silicon carbide (SiC), flash sintering (FS), current path, instantaneous, pyrolytic carbon (PyC) "bridges"

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Publication history

Received: 20 October 2023
Revised: 31 December 2023
Accepted: 01 January 2024
Published: 22 February 2024
Issue date: February 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

This research work was supported by the National Natural Science Foundation of China (No. 92160202), the National Natural Science Foundation of China (No. 52375188), the National Key R&D Program of China (No. 2021YFB3703100), and the Ningbo Key Technology Research and Development (No. 2023T007).

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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