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A novel Y3Si2C2 material was synthesized at a relatively low temperature (900 ℃) using a molten salt method for the first time, and subsequently used as the joining material for carbon fiber reinforced SiC (Cf/SiC) composites. The sound near-seamless joints with no obvious remaining interlayer were obtained at 1600 ℃ using an electric field-assisted sintering technique (FAST). During joining, a liquid phase was formed by the eutectic reaction among Y3Si2C2, γ(Y-C) phase, and SiC, followed by the precipitation of SiC particles. The presence of the liquid promoted the sintering of newly formed SiC particles, leading to their complete consolidation with the Cf/SiC matrix. On the other hand, the excess of the liquid was pushed away from the joining area under the effect of a uniaxial pressure of 30 MPa, leading to the formation of the near-seamless joints. The highest shear strength (τ) of 17.2±2.9 MPa was obtained after being joined at 1600 ℃ for 10 min. The failure of the joints occurred in the Cf/SiC matrix, indicating that the interface was stronger than that of the Cf/SiC matrix. The formation of a near-seamless joint minimizes the mismatch of thermal expansion coefficients and also irradiation-induced swelling, suggesting that the proposed joining strategy can be potentially applied to SiC-based ceramic matrix composites (CMCs) for extreme environmental applications.


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Near-seamless joining of Cf/SiC composites using Y3Si2C2 via electric field-assisted sintering technique

Show Author's information Teng YUaJie XUaXiaobing ZHOUa( )Peter TATARKOb,cYang LIdZhengren HUANGaQing HUANGa
Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, 845 36 Bratislava, Slovakia
Centre of Excellence for Advanced Materials Application, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava, Slovakia
National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China

† Teng Yu and Jie Xu contributed equally to this work.

Abstract

A novel Y3Si2C2 material was synthesized at a relatively low temperature (900 ℃) using a molten salt method for the first time, and subsequently used as the joining material for carbon fiber reinforced SiC (Cf/SiC) composites. The sound near-seamless joints with no obvious remaining interlayer were obtained at 1600 ℃ using an electric field-assisted sintering technique (FAST). During joining, a liquid phase was formed by the eutectic reaction among Y3Si2C2, γ(Y-C) phase, and SiC, followed by the precipitation of SiC particles. The presence of the liquid promoted the sintering of newly formed SiC particles, leading to their complete consolidation with the Cf/SiC matrix. On the other hand, the excess of the liquid was pushed away from the joining area under the effect of a uniaxial pressure of 30 MPa, leading to the formation of the near-seamless joints. The highest shear strength (τ) of 17.2±2.9 MPa was obtained after being joined at 1600 ℃ for 10 min. The failure of the joints occurred in the Cf/SiC matrix, indicating that the interface was stronger than that of the Cf/SiC matrix. The formation of a near-seamless joint minimizes the mismatch of thermal expansion coefficients and also irradiation-induced swelling, suggesting that the proposed joining strategy can be potentially applied to SiC-based ceramic matrix composites (CMCs) for extreme environmental applications.

Keywords:

Cf/SiC, joining, Y3Si2C2, electric field-assisted sintering technique (FAST)
Received: 05 October 2021 Revised: 26 March 2022 Accepted: 29 March 2022 Published: 18 July 2022 Issue date: August 2022
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Publication history

Received: 05 October 2021
Revised: 26 March 2022
Accepted: 29 March 2022
Published: 18 July 2022
Issue date: August 2022

Copyright

© The Author(s) 2022.

Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 11975296) and the Natural Science Foundation of Ningbo City (Grant No. 2021J199). We would like to recognize the support from the Ningbo 3315 Innovative Teams Program, China (Grant No. 2019A-14-C). Peter TATARKO gratefully acknowledges the financial support of the project APVV-17-0328, and this study was performed as part of the implementation of the project "Building-up Centre for advanced materials application of the Slovak Academy of Sciences" and ITMS project (Grant No. 313021T081), supported by the Research & Innovation Operational Programme funded by the ERDF.

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