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2012 , Vol. 70 >Issue 01: 99 - 102

DOI: https://doi.org/10.6023/A1110271

研究简报

含硅聚硼氮烷裂解转化制备氮化硼陶瓷纤维

  • 李文华 ,
  • 王军 ,
  • 谢征芳 ,
  • 王浩 ,
  • 唐云
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  • 国防科技大学新型陶瓷纤维及其复合材料国防科技重点实验室, 长沙 410073

收稿日期: 2011-10-27

  修回日期: 2011-12-19

  网络出版日期: 2012-02-25

基金资助

武器装备探索重大项目(No.7130902)和国家自然科学基金(Nos.50702075,51172280)资助项目.

收起

Preparation of Boron Nitride Ceramic Fibers by Pyrolysis of Silicon-containing Polyborazine

  • LI Wen-Hua ,
  • WANG Jun ,
  • XIE Zheng-Fang ,
  • WANG Hao ,
  • TANG Yun
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  • State Key Laboratory of Advanced Ceramic Fibers&Composites, National University of Defense Technology, Changsha 410073

Received date: 2011-10-27

  Revised date: 2011-12-19

  Online published: 2012-02-25

Supported by

Project supported by the Exploring Project for Weapon&Equipment(No.7130902)and National Natural Science Foundation of China(Nos.50702075 and 51172280).

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摘要

以低活性含硅聚硼氮烷为先驱体,经熔融纺丝,BCl3脱硅不熔化处理以及在氨气气氛中高温裂解制备的氮化硼纤维仍含有硅元素,这主要是含硅聚硼氮烷结构中的B-N(SiMe3)2和B-N(SiMe3)-B由于位阻与BCl3反应脱除SiMe3不完全所致.而采用HCl首先与含硅聚硼氮烷反应减少其位阻,再通过BCl3进一步脱硅不熔化处理制备的氮化硼陶瓷纤维经FT-IR、X射线衍射(XRD)分析表明纤维基本不含硅元素,并且扫描电子显微镜(SEM)表明得到的氮化硼陶瓷纤维直径约为11μm,断面致密无孔,室温下抗拉强度为0.45GPa.

关键词： BN陶瓷纤维; 先驱体转化法; 含硅聚硼氮烷

本文引用格式

李文华 , 王军 , 谢征芳 , 王浩 , 唐云 . 含硅聚硼氮烷裂解转化制备氮化硼陶瓷纤维[J]. 化学学报, 2012 , 70(01) : 99 -102 . DOI: 10.6023/A1110271

Abstract

Silicon still exists in boron nitride(BN)ceramic fibers which were prepared by melt-spinning, curing with BCl3 and pyrolysis under NH3 of a preceramic silicon-containing polyborazine.That is because B-N(SiMe3)2 and B-N(SiMe3)-B could not react with BCl3 completely for the steric hindrance.So HCl was used to react with silicon-containing polyborazine first to reduce its steric hindrance.Then,BCl3 reacted with silicon-containing polyborazine to remove the residual SiMe3.After pyrolysis under NH3,BN ceramic fibers without silicon were obtained which was proved by FT-IR and X-ray diffraction.The obtained BN ceramic fibers with diameter of about 11μm were dense which was demonstrated by scanning electron mi- croscopy(SEM)and the fibers showed room temperature mechanical property with average tensile strength of 0.45GPa.

Key words： BN ceramic fiber; polymer pyrolysis; silicon-containing polyborazine

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