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

DU Li; DONG Zhi-jun; YUAN Guan-ming; CONG Ye; ZHU Hui; LI Xuan-ke; LUO Yong-ming

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Article Navigation > New Carbon Mater. > 2019 > 34(3): 286-295

DU Li, DONG Zhi-jun, YUAN Guan-ming, CONG Ye, ZHU Hui, LI Xuan-ke, LUO Yong-ming. Preparation and oxidation resistance of Si-B co-doped pitch-based carbon fibers. New Carbon Mater., 2019, 34(3): 286-295.

Citation:

DU Li, DONG Zhi-jun, YUAN Guan-ming, CONG Ye, ZHU Hui, LI Xuan-ke, LUO Yong-ming. Preparation and oxidation resistance of Si-B co-doped pitch-based carbon fibers. New Carbon Mater., 2019, 34(3): 286-295.

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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).

Received Date: 2019-02-21
Accepted Date: 2019-06-27
Rev Recd Date: 2019-05-20
Publish Date: 2019-06-28

Abstract

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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References(16)

References

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