气相硼催化石墨化炭纤维对其力学性能和微观结构的影响

王慧奇; 郭全贵; 刘占军; 韩涛; 冯志海; 刘朗

气相硼催化石墨化炭纤维对其力学性能和微观结构的影响

1.
中北大学材料科学与工程学院山西太原030051;
2.
中国科学院山西煤炭化学研究所炭材料重点实验室山西太原030001;
3.
航天工艺材料研究所先进功能复合材料技术国防科技重点实验室, 北京100076

基金项目: 国家重点基础研究发展计划(2011CB605802);中北大学青年科学基金.

详细信息

作者简介:
王慧奇,博士. E-mail: hqiwang@nuc.edu.cn

通讯作者:
郭全贵,研究员. E-mail:qgguo@sxicc.ac.cn

中图分类号: TB321
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- 被引次数: 0
出版历程
- 收稿日期: 2015-01-20
- 录用日期: 2015-05-04
- 修回日期: 2015-04-02
- 刊出日期: 2015-04-28

Effect of boron-catalyzed graphitization on the mechanical properties and microstructure of carbon fibers

1.
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;
2.
Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
3.
National Key Laboratory of Advanced Functional Composites Materials, Aerospace Research Institute of Material and Processing Technology, Beijing 100076, China

Funds: National Basic Research Program of China (2011CB605802); School Science Foundation of North University of China.

摘要

摘要: 采用间接法将硼引入炭纤维(CF)中,即先将硼引入石墨坩埚中,然后将CF放到坩埚中,升温进行石墨化处理,石墨坩埚中的硼扩散出来,进入纤维中,借助硼的催化石墨化特性,从而制备出硼掺杂石墨纤维。研究硼含量对炭纤维力学性能的影响。利用X射线光电子能谱、X射线衍射、拉曼光谱、扫描电子显微镜、高分辨透射电子显微镜对所制石墨纤维中的硼含量、结构和形貌进行表征和分析。结果表明:石墨纤维中的硼含量可控,硼的催化石墨化作用,提高了CF的石墨化度,由于硼的固溶特性引入了一些缺陷,使得CF的微结构和力学性能发生变化;通过调控CF中的硼含量(0.58%-0.68%),能够在CF强度不损失的情况下提高其模量。
- 气相硼 /
- 催化石墨化 /
- 炭纤维 /
- 微结构 /
- 力学性能
Abstract: Boron-catalyzed graphitization of carbon fibers was conducted in a boron-doped graphite crucible at 2 000 ℃, in which boron diffused from the crucible to the carbon fibers to act as the catalyst. The microstructures, boron contents and mechanical properties of the resulting carbon fibers were characterized by Raman spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and mechanical tests. Results indicate that boron has a significant impact on the fiber microstructure. Raman spectra indicate the presence of distortions in the graphitic layers. The tensile modulus of boron-doped carbon fibers obviously increases with boron content and the tensile strength is also higher than that of the original carbon fibers at boron concentrations between 0.58 to 0.68 at.%.
- Catalytic graphitization /
- Vapor-doping boron /
- Carbon fibers /
- Microstructure /
- Mechanical properties

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