Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

Bingzhu WANG; Daxin LI; Zhihua YANG; Dechang JIA; Jingyi GUAN; Hao PENG; Delong CAI; Peigang HE; Xiaoming DUAN; Yu ZHOU; Tao ZHANG; Chenguang GAO

doi:10.1007/s40145-020-0410-9

Journal of Advanced Ceramics 2020, 9(6): 739-748 https://doi.org/10.1007/s40145-020-0410-9

Research Article |

Open Access | Issue | Published: 27 November 2020

Microstructural evolution and mechanical properties of in situ nano Ta₄HfC₅ reinforced SiBCN composite ceramics

Show Author's Information Hide Author's Information Bingzhu WANG^{^a^,^b}, Daxin LI^{^a^,^b}(

), Zhihua YANG^{^a^,^b^,^c}, Dechang JIA^{^a^,^b^,^c}(

), Jingyi GUAN^{^a^,^b}, Hao PENG^{^a^,^b}, Delong CAI^{^a^,^b}, Peigang HE^{^a^,^b}, Xiaoming DUAN^{^a^,^b}, Yu ZHOU^{^a^,^b}, Tao ZHANG^{^d}, Chenguang GAO^{^d}

aInstitute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

bKey Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China

cState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

dBeijing Institute of Control Engineering, Beijing 100080, China

Keywords:

mechanical properties, Ta₄HfC₅, SiBCN, microstructure evolution

Cite this article:

WANG B, LI D, YANG Z, et al. Microstructural evolution and mechanical properties of in situ nano Ta₄HfC₅ reinforced SiBCN composite ceramics. Journal of Advanced Ceramics, 2020, 9(6): 739-748. https://doi.org/10.1007/s40145-020-0410-9

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Abstract

The in situ nano Ta₄HfC₅ reinforced SiBCN-Ta₄HfC₅ composite ceramics were prepared by a combination of two-step mechanical alloying and reactive hot-pressing sintering. The microstructural evolution and mechanical properties of the resulting SiBCN-Ta₄HfC₅ were studied. After the first-step milling of 30 h, the raw materials of TaC and HfC underwent crushing, cold sintering, and short-range interdiffusion to finally obtain the high pure nano Ta₄HfC₅. A hybrid structure of amorphous SiBCN and nano Ta₄HfC₅ was obtained by adopting a second-step ball-milling. After reactive hot-pressing sintering, amorphous SiBCN has crystallized to 3C-SiC, 6H-SiC, and turbostratic BN(C) phases and Ta₄HfC₅ retained the form of the nanostructure. With the in situ generations of 2.5 wt% Ta₄HfC₅, Ta₄HfC₅ is preferentially distributed within the turbostratic BN(C); however, as Ta₄HfC₅ content further raised to 10 wt%, it mainly distributed in the grain-boundary of BN(C) and SiC. The introduction of Ta₄HfC₅ nanocrystals can effectively improve the flexural strength and fracture toughness of SiBCN ceramics, reaching to 344.1 MPa and 4.52 MPa·m^1/2, respectively. This work has solved the problems of uneven distribution of ultra-high temperature phases in the ceramic matrix, which is beneficial to the real applications of SiBCN ceramics.

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Microstructural evolution and mechanical properties of in situ nano Ta₄HfC₅ reinforced SiBCN composite ceramics

Show Author's information Hide Author's Information Bingzhu WANG^{^a^,^b}, Daxin LI^{^a^,^b}(

), Zhihua YANG^{^a^,^b^,^c}, Dechang JIA^{^a^,^b^,^c}(

), Jingyi GUAN^{^a^,^b}, Hao PENG^{^a^,^b}, Delong CAI^{^a^,^b}, Peigang HE^{^a^,^b}, Xiaoming DUAN^{^a^,^b}, Yu ZHOU^{^a^,^b}, Tao ZHANG^{^d}, Chenguang GAO^{^d}

aInstitute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

bKey Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China

cState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

dBeijing Institute of Control Engineering, Beijing 100080, China

Abstract

Keywords: mechanical properties, Ta₄HfC₅, SiBCN, microstructure evolution

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Acknowledgements

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Publication history

Received: 11 March 2020

Revised: 25 June 2020

Accepted: 16 July 2020

Published: 27 November 2020

Issue date: December 2020

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Acknowledgements

We appreciate the financial support from the National Natural Science Foundation of China (52002092, 51621091, 51472059, 51225203, and 51272300), the National Key Research and Development Program (2017YFB0310400), the Postdoctoral Innovative Talents Support Program (BX20190095), and the China Postdoctoral Science Foundation (Grant Nos. LBH-Z19141 and 2019M660072). This work was also funded by Advanced Space Propulsion Laboratory of BICE and Beijing Engineering Research center of Efficient and Green Aerospace Propulsion Technology (No. LabASP-2019-08).

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