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Journal of Advanced Ceramics 2024, 13(1): 53-62 https://doi.org/10.26599/JAC.2024.9220835
Research Article | Open Access | Issue | Published: 18 January 2024

High strength mullite-bond SiC porous ceramics fabricated by digital light processing

Show Author's Information Jian Sun1,  Jingde Zhang1,2,  Xu Zhang1,  Zihe Li3,  Jianzhang Li4,  Sijie Wei1,5,  Weibin Zhang1,  Weili Wang1,  Guifang Han1( )
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China
Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250100, China
Materials and Structures Research Centre, Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK
National Engineering Research Centre of Ceramic Matrix Composite Manufacture Technology, Xi’an Golden Mountain Ceramic Composites Co., Ltd., Xi’an 710118, China
School of Physics and Materials Science, Changji University, Changji 831100, China
Keywords:
digital light processing (DLP), mechanical properties, SiC ceramics, pre-oxidation, mullite-bond SiC
Cite this article:
Sun J, Zhang J, Zhang X, et al. High strength mullite-bond SiC porous ceramics fabricated by digital light processing. Journal of Advanced Ceramics, 2024, 13(1): 53-62. https://doi.org/10.26599/JAC.2024.9220835
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Abstract Full text About this article

Fabricating SiC ceramics via the digital light processing (DLP) technology is of great challenge due to strong light absorption and high refractive index of deep-colored SiC powders, which highly differ from those of resin, and thus significantly affect the curing performance of the photosensitive SiC slurry. In this paper, a thin silicon oxide (SiO2) layer was in-situ formed on the surface of SiC powders by pre-oxidation treatment. This method was proven to effectively improve the curing ability of SiC slurry. The SiC photosensitive slurry was fabricated with solid content of 55 vol% and viscosity of 7.77 Pa·s (shear rate of 30 s−1). The curing thickness was 50 μm with exposure time of only 5 s. Then, a well-designed sintering additive was added to completely convert low-strength SiO2 into mullite reinforcement during sintering. Complex-shaped mullite-bond SiC ceramics were successfully fabricated. The flexural strength of SiC ceramics sintered at 1550 ℃ in air reached 97.6 MPa with porosity of 39.2 vol%, as high as those prepared by spark plasma sintering (SPS) techniques.


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About this article

High strength mullite-bond SiC porous ceramics fabricated by digital light processing

Show Author's information Jian Sun1, Jingde Zhang1,2, Xu Zhang1, Zihe Li3, Jianzhang Li4, Sijie Wei1,5, Weibin Zhang1, Weili Wang1, Guifang Han1( )
Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China
Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250100, China
Materials and Structures Research Centre, Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK
National Engineering Research Centre of Ceramic Matrix Composite Manufacture Technology, Xi’an Golden Mountain Ceramic Composites Co., Ltd., Xi’an 710118, China
School of Physics and Materials Science, Changji University, Changji 831100, China

Abstract

Fabricating SiC ceramics via the digital light processing (DLP) technology is of great challenge due to strong light absorption and high refractive index of deep-colored SiC powders, which highly differ from those of resin, and thus significantly affect the curing performance of the photosensitive SiC slurry. In this paper, a thin silicon oxide (SiO2) layer was in-situ formed on the surface of SiC powders by pre-oxidation treatment. This method was proven to effectively improve the curing ability of SiC slurry. The SiC photosensitive slurry was fabricated with solid content of 55 vol% and viscosity of 7.77 Pa·s (shear rate of 30 s−1). The curing thickness was 50 μm with exposure time of only 5 s. Then, a well-designed sintering additive was added to completely convert low-strength SiO2 into mullite reinforcement during sintering. Complex-shaped mullite-bond SiC ceramics were successfully fabricated. The flexural strength of SiC ceramics sintered at 1550 ℃ in air reached 97.6 MPa with porosity of 39.2 vol%, as high as those prepared by spark plasma sintering (SPS) techniques.

Keywords: digital light processing (DLP), mechanical properties, SiC ceramics, pre-oxidation, mullite-bond SiC

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Publication history
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Publication history

Received: 20 September 2023
Revised: 11 November 2023
Accepted: 27 November 2023
Published: 18 January 2024
Issue date: January 2024

Copyright

© The Author(s) 2024.

Acknowledgements

Acknowledgements

This work was supported by Shandong University−MSEA International Institute for Materials Genome Joint Innovation Center for Advanced Ceramics, and the Key Research and Development Projects of Shaanxi Province (Nos. 2018ZDCXL-GY-09-06 and 2021ZDLGY14-06).

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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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