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A nano-laminated Y3Si2C2 ceramic material was successfully synthesized via an in situ reaction between YH2 and SiC using spark plasma sintering technology. A MAX phase-like ternary layered structure of Y3Si2C2 was observed at the atomic-scale by high resolution transmission electron microscopy. The lattice parameters calculated from both X-ray diffraction and selected area electron diffraction patterns are in good agreement with the reported theoretical results. The nano-laminated fracture of kink boundaries, delamination, and slipping were observed at the tip of the Vickers indents. The elastic modulus and Vickers hardness of Y3Si2C2 ceramics (with 5.5 wt% Y2O3) sintered at 1500 ℃ were 156 and 6.4 GPa, respectively. The corresponding values of thermal and electrical conductivity were 13.7 W·m-1·K-1 and 6.3×105 S·m-1, respectively.


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Microstructure and properties of nano-laminated Y3Si2C2 ceramics fabricated via in situ reaction by spark plasma sintering

Show Author's information Lin-Kun SHIa,bXiaobing ZHOUb( )Jian-Qing DAIa( )Ke CHENbZhengren HUANGbQing HUANGb
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

Abstract

A nano-laminated Y3Si2C2 ceramic material was successfully synthesized via an in situ reaction between YH2 and SiC using spark plasma sintering technology. A MAX phase-like ternary layered structure of Y3Si2C2 was observed at the atomic-scale by high resolution transmission electron microscopy. The lattice parameters calculated from both X-ray diffraction and selected area electron diffraction patterns are in good agreement with the reported theoretical results. The nano-laminated fracture of kink boundaries, delamination, and slipping were observed at the tip of the Vickers indents. The elastic modulus and Vickers hardness of Y3Si2C2 ceramics (with 5.5 wt% Y2O3) sintered at 1500 ℃ were 156 and 6.4 GPa, respectively. The corresponding values of thermal and electrical conductivity were 13.7 W·m-1·K-1 and 6.3×105 S·m-1, respectively.

Keywords:

Y3Si2C2, rare earth silicide carbides, spark plasma sintering (SPS), ternary layered structure ceramic, properties
Received: 01 October 2020 Revised: 08 January 2021 Accepted: 12 January 2021 Published: 26 April 2021 Issue date: June 2021
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Publication history
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Publication history

Received: 01 October 2020
Revised: 08 January 2021
Accepted: 12 January 2021
Published: 26 April 2021
Issue date: June 2021

Copyright

© The Author(s) 2021

Acknowledgements

We would like to appreciate the support from the Ningbo 3315 Innovative Teams Program, China (Grant No. 2019A-14-C). This study was supported by the National Natural Science Foundation of China (Grant Nos. 11975296 and 51811540402).

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