Microstructural evolution of polymer-derived hexagonal boron nitride fibres under high-temperature stretching
作者机构：University of Chinese Academy of SciencesBeijing 100080China Key Laboratory of Science and Technology on Particle MaterialsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100080China Ganjiang Innovation AcademyChinese Academy of SciencesGanzhou 341119China Shandong Industrial Ceramics Research and Design InstituteZibo 255000China
出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)
年 卷 期：2023年第12卷第10期
页 面：1973-1988页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070205[理学-凝聚态物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 070301[理学-无机化学] 0702[理学-物理学]
基 金：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,ZDRW-CN-2021-3) Projects of Ganjiang Innovation Academy CAS(Grant Nos.E155D001,E055A002) and the Double Thousand Plan of Jiangxi Province(Grant No.JXSQ2020105012)
主 题：polymer-derived ceramics boron nitride fibres microstructural evolution high-temperature stretching
摘 要：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 *** 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 ***,the grain size,pore structure,orientation degree,microscopic morphology,and mechanical properties were analysed at room *** results show that high-temperature stretching enhances the orientation degree of the BN fibres,consequently elevating Young’s *** maximum orientation degree of the BN fibres was 86%,aligning with a corresponding Young’s modulus of 206 ***,high-temperature stretching enlarged the sizes of grains and pores,a fact substantiated by the radial cracking of the fibres upon extending thermal stretching *** to the expanded pore structure of the BN fibres and the inability to form a sufficiently strong“card structurebetween shorter microfibre bundles,the tensile strength of the BN fibres did not increase continually,reaching a maximum of 1.0 *** 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 *** findings offer a theoretical foundation for the preparation of high-performance h-BN fibres.
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