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Novel ZrB2-matrix composites were designed and prepared by in-situ introducing SiC and Zr2[Al(Si)]4C5 simultaneously for the first time. The obtained composites were dense and showed good mechanical properties, especially the strength and toughness, 706 MPa and 7.33 MPa·m1/2, respectively, coupled with high hardness of 21.3 GPa, and stiffness of 452 GPa. SiC and Zr2[Al(Si)]4C5 constituted a reinforcing system with synergistic effects including grain refinement, grain pull-out as well as crack branching, bridging, and deflection. Besides, the oxidation results of the composites showed that the oxidation kinetics followed the parabolic law at 1600 ℃, and the oxidation rate constants increased with the increase of Zr2[Al(Si)]4C5 content. The formation and evolution model of the oxidation structure was also investigated, and the oxide scale of the composite exhibited a three-layer structure.


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Design and preparation of an ultra-high temperature ceramic by in-situ introduction of Zr2[Al(Si)]4C5 into ZrB2-SiC: Investigation on the mechanical properties and oxidation behavior

Show Author's information Lei YUa( )Hui LIUa,bYaohui FUaWeijiang HUaZhefei WANGa,c( )Quan LIUaBo WEIaJian YANGdTai QIUd
School of Materials Engineering, Changshu Institute of Technology, Changshu 215500, China
School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China

Abstract

Novel ZrB2-matrix composites were designed and prepared by in-situ introducing SiC and Zr2[Al(Si)]4C5 simultaneously for the first time. The obtained composites were dense and showed good mechanical properties, especially the strength and toughness, 706 MPa and 7.33 MPa·m1/2, respectively, coupled with high hardness of 21.3 GPa, and stiffness of 452 GPa. SiC and Zr2[Al(Si)]4C5 constituted a reinforcing system with synergistic effects including grain refinement, grain pull-out as well as crack branching, bridging, and deflection. Besides, the oxidation results of the composites showed that the oxidation kinetics followed the parabolic law at 1600 ℃, and the oxidation rate constants increased with the increase of Zr2[Al(Si)]4C5 content. The formation and evolution model of the oxidation structure was also investigated, and the oxide scale of the composite exhibited a three-layer structure.

Keywords:

ZrB2-matrix composites, ultra-high temperature ceramics (UHTCs), mechanical properties, strengthening and toughening mechanism, oxidation behavior
Received: 22 February 2021 Revised: 26 April 2021 Accepted: 04 May 2021 Published: 16 September 2021 Issue date: October 2021
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Publication history
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Publication history

Received: 22 February 2021
Revised: 26 April 2021
Accepted: 04 May 2021
Published: 16 September 2021
Issue date: October 2021

Copyright

© The Author(s) 2021

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51902031), the Natural Science Foundation of the Jiangsu Higher Education Institute of China (Nos. 18KJB430002 and 18KJB430001), the Six Talent Peaks Project of Jiangsu Province (No. 2018- SWYY-001), and the Scientific Research Foundation of Changshu Institute of Technology (No. XZ1639). The authors would also like to thank Prof. Guojun ZHANG and Dr. Fei LI from Donghua University for the modulus test.

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