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Research Article | Open Access

Microstructure and mechanical properties of 3D Cf/SiBCN composites fabricated by polymer infiltration and pyrolysis

Bowen CHENa,b,c,†, Qi DINGa,b,†, Dewei NIa,b( ), Hongda WANGa,b, Yusheng DINGa,b( ), Xiangyu ZHANGa,b, Shaoming DONGa,b,d
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
University of Chinese Academy of Sciences, Beijing 100049, China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

† Bowen Chen and Qi Ding contributed equally to this work.

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Abstract

In this work, three-dimensional (3D) Cf/SiBCN composites were fabricated by polymer infiltration and pyrolysis (PIP) with poly(methylvinyl)borosilazane as SiBCN precursor. The 3D microstructure evolution process of the composites was investigated by an advanced X-ray computed tomography (XCT). The effect of dicumyl peroxide (DCP) initiator addition on the crosslinking process, microstructure evolution, and mechanical properties of the composites were uncovered. With the addition of a DCP initiator, the liquid precursor can cross-linking to solid-state at 120 ℃. Moreover, DCP addition decreases the release of small molecule gas during pyrolysis, leading to an improved ceramic yield 4.67 times higher than that without DCP addition. After 7 PIP cycles, density and open porosity of the final Cf/SiBCN composite with DCP addition are 1.73 g·cm-3 and ~10%, respectively, which are 143.0% higher and 30.3% lower compared with the composites without DCP addition. As a result, the flexural strength and elastic modulus of Cf/SiBCN composites with DCP addition (371 MPa and 31 GPa) are 1.74 and 1.60 times higher than that without DCP addition (213 MPa and 19.4 GPa), respectively.

Keywords

Cf/SiBCNceramic matrix compositesdicumyl peroxide (DCP)X-ray computed tomography (XCT)

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Journal of Advanced Ceramics
Volume 10 Issue 1,
February 2021
Pages 28-38
DOI: 10.1007/s40145-020-0414-5
Cite this article:
CHEN B, DING Q, NI D, et al. Microstructure and mechanical properties of 3D Cf/SiBCN composites fabricated by polymer infiltration and pyrolysis. Journal of Advanced Ceramics, 2021, 10(1): 28-38. https://doi.org/10.1007/s40145-020-0414-5

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Received: 29 May 2020
Revised: 05 August 2020
Accepted: 25 August 2020
Published: 24 November 2020
© The Author(s) 2020

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