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Research Article | Open Access

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

Bingzhu WANGa,b, Daxin LIa,b( ), Zhihua YANGa,b,c, Dechang JIAa,b,c( ), Jingyi GUANa,b, Hao PENGa,b, Delong CAIa,b, Peigang HEa,b, Xiaoming DUANa,b, Yu ZHOUa,b, Tao ZHANGd, Chenguang GAOd
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Beijing Institute of Control Engineering, Beijing 100080, China
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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·m1/2, 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.

Keywords

Ta4HfC5SiBCNmicrostructure evolutionmechanical properties

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Journal of Advanced Ceramics
Volume 9 Issue 6,
December 2020
Pages 739-748
DOI: 10.1007/s40145-020-0410-9
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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Received: 11 March 2020
Revised: 25 June 2020
Accepted: 16 July 2020
Published: 27 November 2020
© The Author(s) 2020

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