Structure of silicon-modified mesophase pitch-based graphite fibers

被引:25
作者
Wang, Liyong [1 ,2 ,3 ]
Liu, Zhanjun [1 ]
Guo, Quangui [1 ]
Yang, Jinhua [4 ]
Dong, Xiaozhong [1 ]
Li, Denghua [1 ]
Liu, Junqing [5 ]
Shi, Jingli [6 ]
Lu, Chunxiang [1 ]
Liu, Lang [1 ]
机构
[1] Chinese Acad Sci, Inst Coal Chem, Key Lab Carbon Mat, Taiyuan 030001, Peoples R China
[2] Hebei Normal Univ Nationalities, Dept Phys, Chengde 067000, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Avic Composite Corp Ltd, Beijing 101300, Peoples R China
[5] Natl Inst Clean & Low Carbon Energy, Beijing 102209, Peoples R China
[6] Tianjin Polytech Univ, Tianjin 300387, Peoples R China
基金
中国国家自然科学基金;
关键词
HIGH THERMAL-CONDUCTIVITY; CARBON-FIBERS; BORON; MICROSTRUCTURE; CARBONIZATION; COMPOSITES; TEXTURE;
D O I
10.1016/j.carbon.2015.06.068
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Silicon-modified mesophase pitch-based graphite fibers (SGF) were prepared from mixtures of mesophase pitch and silicon (Si) nanoparticles, followed by fiber spinning, thermo-oxidative stabilization, carbonization and graphitization. The morphology and microstructure as well as physical properties of the obtained graphite fibers were characterized. Compared with the unmodified graphite fibers (GF), SGF possessed the characteristic of the circular cross section, and no cracks along the fiber axis were observed. Based on the XRD and Raman analysis, Si nanoparticles added in the fiber resulted in the dissimilar orientation of graphitic pleats and changed the crystallite of the SGF. The angle of orientation and the ratio of the intensity of D-Raman peak and G-Raman peak for SGF were increased to 10.59 degrees and 0.25, respectively, which were higher than that of the GF. The small-angle X-ray scattering experiment indicated that Si introduced in the fiber had no effect on the micropore size and pore size distribution compared with that of the GF. The tensile strength and modulus of the Si-modified carbon fibers was 2.42 and 138.8 GPa, respectively. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:335 / 341
页数:7
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