Effect of multiple stretching on microstructure and mechanical properties of PAN-based carbon fibers

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2025-01-19 DOI:10.1007/s42823-024-00840-z

Shuang Li, Di Cui, Yu Wang, Aijun Gao, Yuanjian Tong

引用次数: 0

Abstract

To further increase the mechanical properties of polyacrylonitrile-based carbon fibers, a multiple stretching technique was applied. Carbon fibers were multiple stretched at 2200 °C and characterizations such as SEM, Raman, XRD, and TEM were used to investigate the evolution of microstructure of carbon fibers. It was found that the grooves on the surface of carbon fibers along the fiber axis direction became more obvious and the cross-section of fibers were twisted from nearly circular to elliptical after multiple stretching. Growth and slippage of graphite microcrystals along the fiber axis direction resulted decrease in disordered structure and defects in the carbon fibers and increase in the degree of graphitization. The multiple stretching effectively enhanced the length-to-width ratio of microcrystals. An increase of 75 GPa in tensile modulus and a retention rate of 0.95 in tensile strength were realized for carbon fibers multiple stretched at 2200 °C.

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多次拉伸对pan基碳纤维微观结构和力学性能的影响

为了进一步提高聚丙烯腈基碳纤维的力学性能，采用了多次拉伸技术。在2200℃下对碳纤维进行多次拉伸，利用SEM、Raman、XRD、TEM等表征手段研究碳纤维的微观结构演变。结果发现，碳纤维表面沿纤维轴向的沟槽在多次拉伸后变得更加明显，纤维截面由近圆形扭曲为椭圆形。石墨微晶沿纤维轴方向的生长和滑移减少了碳纤维的无序结构和缺陷，提高了石墨化程度。多次拉伸有效地提高了微晶体的长宽比。经2200℃多次拉伸后，碳纤维的拉伸模量提高了75 GPa，拉伸强度保持率为0.95。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.