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Research Article | Open Access

Creep deformation behavior during densification of ZrB2-SiBCN ceramics with ZrO2 additive

Bo FENG, Zhenhang WANG, Yunhao FAN, Jinghua GU, Yue ZHANG( )
Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China
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Abstract

ZrB2-SiBCN ceramics with ZrO2 additive are hot-pressed under a constant applied pressure. The densification behavior of the composites is studied in a view of creep deformation by means of the Bernard-Granger and Guizard model. With determination of the stress exponent (n) and the apparent activation energy (Qd), the specific deformation mechanisms controlling densification are supposed. Within lower temperature ranges of 1300-1400 ℃, the operative mechanism is considered to be grain boundary sliding accommodated by atom diffusion of the polymer-derived SiBCN (n = 1, Qd = 123±5 kJ/mol) and by viscous flow of the amorphous SiBCN (n = 2, Qd = 249±5 kJ/mol). At higher temperatures, the controlling mechanism transforms to lattice or intra-granular diffusion creep (n = 3-5) due to gradual consumption of the amorphous phase. It is suggested that diffusion of oxygen ions inside ZrO2 into the amorphous SiBCN decreases the viscosity, modifies the fluidity, and contributes to the grain boundary mobility.

Keywords

zirconium boridepolymer-derived SiBCNcreep deformationdensification mechanismviscosity

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Journal of Advanced Ceramics
Volume 9 Issue 5,
October 2020
Pages 544-557
DOI: 10.1007/s40145-020-0393-6
Cite this article:
FENG B, WANG Z, FAN Y, et al. Creep deformation behavior during densification of ZrB2-SiBCN ceramics with ZrO2 additive. Journal of Advanced Ceramics, 2020, 9(5): 544-557. https://doi.org/10.1007/s40145-020-0393-6

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Received: 08 March 2020
Revised: 14 May 2020
Accepted: 29 May 2020
Published: 19 June 2020
© The author(s) 2020

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