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Journal of Advanced Ceramics 2023, 12(10): 1973-1988 https://doi.org/10.26599/JAC.2023.9220801
Research Article | Open Access | Issue | Published: 19 October 2023

Microstructural evolution of polymer-derived hexagonal boron nitride fibres under high-temperature stretching

Show Author's Information Zhiguang Wanga,b,  Min Gea,b,  Shouquan Yub,c,  Xiaoming Sunb,c,  Xueli Qid,  Hao Zhangb,  Wen Xiaoa,b,  Weigang Zhanga,b( )
University of Chinese Academy of Sciences, Beijing 100080, China
Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China
Shandong Industrial Ceramics Research and Design Institute, Zibo 255000, China
Keywords:
microstructural evolution, polymer-derived ceramics, high-temperature stretching, boron nitride fibres
Cite this article:
Wang Z, Ge M, Yu S, et al. Microstructural evolution of polymer-derived hexagonal boron nitride fibres under high-temperature stretching. Journal of Advanced Ceramics, 2023, 12(10): 1973-1988. https://doi.org/10.26599/JAC.2023.9220801
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Abstract Full text About this article

High-temperature stretching plays a crucial role in enhancing the performance of fibres, while a quantitative investigation into the impacts of tension and stretching duration on the microstructure and performance of hexagonal boron nitride (h-BN) fibres remains absent. In this study, to elucidate the microstructural evolution of the h-BN fibres under thermal stretching, amorphous BN fibres were heated at 2000 ℃ under tension of 30, 50, and 70 N for 1, 3, and 5 h in a nitrogen atmosphere. Subsequently, the grain size, pore structure, orientation degree, microscopic morphology, and mechanical properties were analysed at room temperature. The results show that high-temperature stretching enhances the orientation degree of the BN fibres, consequently elevating Young’s modulus. The maximum orientation degree of the BN fibres was 86%, aligning with a corresponding Young’s modulus of 206 GPa. Additionally, high-temperature stretching enlarged the sizes of grains and pores, a fact substantiated by the radial cracking of the fibres upon extending thermal stretching time. Owing to the expanded pore structure of the BN fibres and the inability to form a sufficiently strong "card structure" between shorter microfibre bundles, the tensile strength of the BN fibres did not increase continually, reaching a maximum of 1.0 GPa. Microstructural observations revealed that the BN fibres, composed of highly oriented lamellar h-BN grains, tend to form radial textures under high-tensile thermal stretching and onion-skin textures under prolonged thermal stretching. These findings offer a theoretical foundation for the preparation of high-performance h-BN fibres.


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About this article

Microstructural evolution of polymer-derived hexagonal boron nitride fibres under high-temperature stretching

Show Author's information Zhiguang Wanga,b, Min Gea,b, Shouquan Yub,c, Xiaoming Sunb,c, Xueli Qid, Hao Zhangb, Wen Xiaoa,b, Weigang Zhanga,b( )
University of Chinese Academy of Sciences, Beijing 100080, China
Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China
Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China
Shandong Industrial Ceramics Research and Design Institute, Zibo 255000, China

Abstract

High-temperature stretching plays a crucial role in enhancing the performance of fibres, while a quantitative investigation into the impacts of tension and stretching duration on the microstructure and performance of hexagonal boron nitride (h-BN) fibres remains absent. In this study, to elucidate the microstructural evolution of the h-BN fibres under thermal stretching, amorphous BN fibres were heated at 2000 ℃ under tension of 30, 50, and 70 N for 1, 3, and 5 h in a nitrogen atmosphere. Subsequently, the grain size, pore structure, orientation degree, microscopic morphology, and mechanical properties were analysed at room temperature. The results show that high-temperature stretching enhances the orientation degree of the BN fibres, consequently elevating Young’s modulus. The maximum orientation degree of the BN fibres was 86%, aligning with a corresponding Young’s modulus of 206 GPa. Additionally, high-temperature stretching enlarged the sizes of grains and pores, a fact substantiated by the radial cracking of the fibres upon extending thermal stretching time. Owing to the expanded pore structure of the BN fibres and the inability to form a sufficiently strong "card structure" between shorter microfibre bundles, the tensile strength of the BN fibres did not increase continually, reaching a maximum of 1.0 GPa. Microstructural observations revealed that the BN fibres, composed of highly oriented lamellar h-BN grains, tend to form radial textures under high-tensile thermal stretching and onion-skin textures under prolonged thermal stretching. These findings offer a theoretical foundation for the preparation of high-performance h-BN fibres.

Keywords: microstructural evolution, polymer-derived ceramics, high-temperature stretching, boron nitride fibres

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Publication history
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Publication history

Received: 24 June 2023
Revised: 13 August 2023
Accepted: 02 September 2023
Published: 19 October 2023
Issue date: October 2023

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© The Author(s) 2023.

Acknowledgements

This research was financially supported by the Key Laboratory of Science and Technology on Particle Materials (Grant No. CXJJ-21S043), the Key Laboratory of Multiphase Complex Systems (Grant No. MPCS-2021-a-02), the Key Research Program of the Chinese Academy of Sciences (Grant Nos. ZDRW-CN-2021-2 and ZDRW-CN-2021-3), Projects of Ganjiang Innovation Academy CAS (Grant Nos. E155D001 and E055A002), and the Double Thousand Plan of Jiangxi Province (Grant No. JXSQ2020105012).

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