无机材料学报2026，Vol.41Issue(3)：359-369,中插7,12.DOI:10.15541/jim20250275
BNNS/聚硼氮烷杂化先驱体转化BN纤维中的纳米片尺寸效应
Size Effect of Nanosheet on BN Fibers Derived from BNNS/Polyborazine Hybrid Precursor
摘要
Abstract
BN ceramic fibers exhibit significant potential for applications in high-temperature wave-transparent and semiconductor fields,due to their excellent resistance to high temperatures and thermal conductivity,as well as their outstanding wave-transparent performance.However,the low crystallinity observed in BN ceramic fibers inhibits complete realization of their potential superior properties associated with the h-BN crystal structure.In this work,based on the mechanism that inorganic nanofillers could act as heterogeneous nucleating agents to accelerate matrix crystallization,three lateral sizes(0.5,2 and 4 μm)of amino-functionalized BN nanosheets(BNNSs)were prepared utilizing a one-step ball milling method.BNNSs were chemically bonded to molecular chain of polyborazine to synthesize hybrid BNNS/polyborazine precursors,which were finally derived into high-performance BN ceramic fibers with high crystallinity.This investigation thoroughly explored the scale effects of BNNS on the molecular structure of hybrid precursor,as well as their physicochemical properties and melt spinning performance.Relationship among the BNNSs'size,microstructure and mechanical properties was elucidated.Increasing BNNSs size could enhance the ceramic yield of precursor(up to 64.1%),but destroy the viscosity-time stability.Moreover,it was demonstrated that BNNS scale could evidently regulate crystal structure of BN ceramic fibers.Relationship among the BNNSs'lateral sizes,crystal structure and mechanical performance was determined to be non-linear.BN ceramic fibers containing 2 μm BNNS displayed the highest crystallinity(94%),grain size(12.5 nm)and density(2.00 g/cm3).However,surface defects associated with 2 μm BNNS resulted in a non-optimal average tensile strength(0.90 GPa).BN ceramic fibers doped with 0.5 μm BNNS exhibited the best average tensile strength(0.94 GPa),attributed to the favorable combination of high crystallinity and smooth surface.This work could provide crucial references for fine regulation of microstructure and preparation of high-performance BN ceramic fibers.关键词
BN陶瓷纤维/晶体结构/力学性能/BN纳米片/BNNS尺寸效应Key words
BN ceramic fiber/crystal structure/mechanical property/BN nanosheet/BNNS size effect分类
化学化工引用本文复制引用
张韵铂,王兵,李威,宋曲之,杜贻昂,王应德..BNNS/聚硼氮烷杂化先驱体转化BN纤维中的纳米片尺寸效应[J].无机材料学报,2026,41(3):359-369,中插7,12.基金项目
国防科技大学(23-ZZCX-JDZ-38) （23-ZZCX-JDZ-38）
湖南省自然科学基金(2023JJ40673)National University of Defense Technology(23-ZZCX-JDZ-38) （2023JJ40673）
Hunan Provincial Natural Science Foundation(2023JJ40673) （2023JJ40673）
