Si—B掺杂沥青基炭纤维的制备及其抗氧化性能

杜力; 董志军; 袁观明; 丛野; 朱辉; 李轩科; 罗永明

Si—B掺杂沥青基炭纤维的制备及其抗氧化性能

杜力^1,2,
董志军^1,2,,
袁观明²,
丛野^1,2,
朱辉²,
李轩科³,
罗永明⁴

1.
武汉科技大学, 省部共建耐火材料与冶金国家重点实验室, 湖北武汉 430081;
2.
武汉科技大学, 湖北省煤转化与新型炭材料重点实验室, 湖北武汉 430081;
3.
湖南大学, 先进炭材料及应用技术湖南重点实验室, 湖南长沙 410082;
4.
中国科学院化学研究所, 北京 100190

基金项目: 国家自然科学基金专项项目（51352001）；国家自然科学基金重大研究计划重点项目（91016003）.

详细信息

作者简介:
杜力,硕士研究生.E-mail:18164111219@163.com

通讯作者:
董志军,博士,教授.E-mail:dongzj72@sohu.com;李轩科,博士,教授.E-mail:xkli@21cn.com

中图分类号: TQ342⁺.74
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出版历程
- 收稿日期: 2019-02-21
- 录用日期: 2019-06-27
- 修回日期: 2019-05-20
- 刊出日期: 2019-06-28

Preparation and oxidation resistance of Si-B co-doped pitch-based carbon fibers

1.
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;
2.
The Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China;
3.
Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China;
4.
Institute of Chemistry, Chinese Academy of Science, Beijing 100190, China

Funds: National Natural Science Foundations of China(51352001, 91016003).

摘要

摘要: 为了提高炭纤维的高温抗氧化性能，提出了一种制备Si-B掺杂沥青基炭纤维的方法。通过聚硼硅氮烷（PSNB）和石油沥青低温共裂解合成了Si-B掺杂沥青，Si-B掺杂沥青经熔融纺丝、原丝预氧化和炭化得到Si-B掺杂沥青基炭纤维。研究了Si-B掺杂沥青及其炭纤维的组成、微观结构和低温抗氧化性能。结果表明，随原料沥青中PSNB掺杂比例的提高，Si-B掺杂炭纤维的拉伸强度和杨氏模量逐渐降低，抗氧化性能逐渐增强。1 400℃炭化得到的Si-B掺杂炭纤维在600℃氧化240 min失重率为25%，650℃氧化140 min失重率为60%。未掺杂炭纤维在相同条件下的氧化失重率分别为46%和99%。Si-B掺杂炭纤维氧化形成的B₂O₃具有较好的流动性，可以在纤维表面形成连续的玻璃膜，有效地抑制基体炭的氧化。
- 聚硼硅氮烷 /
- 掺杂 /
- 炭纤维 /
- 抗氧化
Abstract: Si-B co-doped pitch-based carbon fibers were prepared from mixtures of polyborosilicane (PSNB) and petroleum pitch with a PSNB content of 3 to 10 wt% to improve their oxidation resistance. The composition, microstructure, mechanical properties and oxidation resistance of the fibers were investigated. Results show that with increasing PSNB content in the pitch, the tensile strength and Young's modulus decrease gradually, but the oxidation resistance increases significantly. For fibers prepared by carbonization at 1400℃, the weight loss is 25% after oxidation at 600℃ for 240 min and 60% after oxidation at 650℃ for 140 min. However, these values are 46% and 99% of the respective values for the un-doped carbon fibers. The B₂O₃ generated during oxidation of the Si-B co-doped carbon fibers has a good fluidity, and as a result a continuous glass film is formed on the surface of the fibers, which effectively inhibits carbon oxidation.
- PSNB /
- Doping /
- Pitch-based carbon fibers /
- Oxidation resistance

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