Properties and Structure of In Situ Transformed PAN-Based Carbon Fibers
Carbon fibers in situ prepared during the hot-pressed sintering in a vacuum is termed in situ transformed polyacrylonitrile-based (PAN-based) carbon fibers, and the fibrous precursors are the pre-oxidized PAN fibers. The properties and structure of in situ transformed PAN-based carbon fibers are inv...
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doaj-0b143ba8c34a463fa9c89a179b6462ae2020-11-25T00:26:18ZengMDPI AGMaterials1996-19442018-06-01116101710.3390/ma11061017ma11061017Properties and Structure of In Situ Transformed PAN-Based Carbon FibersJingjing Cao0Wenwu Zhao1Shuzhen Gao2College of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, ChinaCollege of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, ChinaCollege of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, ChinaCarbon fibers in situ prepared during the hot-pressed sintering in a vacuum is termed in situ transformed polyacrylonitrile-based (PAN-based) carbon fibers, and the fibrous precursors are the pre-oxidized PAN fibers. The properties and structure of in situ transformed PAN-based carbon fibers are investigated by Nano indenter, SEM, TEM, XRD, and Raman. The results showed that the microstructure of the fiber surface layer was compact, while the core was loose, with evenly-appearing microvoids. The elastic modulus and nanohardness of the fiber surface layer (303.87 GPa and 14.82 GPa) were much higher than that of the core (16.57 GPa and 1.54 GPa), and its interlayer spacing d002 and crystallinity were about 0.347 nm and 0.97 respectively. It was found that the preferred orientation of the surface carbon layers with ordered carbon atomic arrangement tended to be parallel to the fiber axis, whereas the fiber core in the amorphous region exhibited a random texture and the carbon atomic arrangement was in a disordered state. It indicates that the in situ transformed PAN-based carbon fibers possess significantly turbostratic structure and anisotropy.http://www.mdpi.com/1996-1944/11/6/1017in situ transformed PAN-based carbon fibersturbostratic structurecarbon layercarbon atomic arrangement |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jingjing Cao Wenwu Zhao Shuzhen Gao |
spellingShingle |
Jingjing Cao Wenwu Zhao Shuzhen Gao Properties and Structure of In Situ Transformed PAN-Based Carbon Fibers Materials in situ transformed PAN-based carbon fibers turbostratic structure carbon layer carbon atomic arrangement |
author_facet |
Jingjing Cao Wenwu Zhao Shuzhen Gao |
author_sort |
Jingjing Cao |
title |
Properties and Structure of In Situ Transformed PAN-Based Carbon Fibers |
title_short |
Properties and Structure of In Situ Transformed PAN-Based Carbon Fibers |
title_full |
Properties and Structure of In Situ Transformed PAN-Based Carbon Fibers |
title_fullStr |
Properties and Structure of In Situ Transformed PAN-Based Carbon Fibers |
title_full_unstemmed |
Properties and Structure of In Situ Transformed PAN-Based Carbon Fibers |
title_sort |
properties and structure of in situ transformed pan-based carbon fibers |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2018-06-01 |
description |
Carbon fibers in situ prepared during the hot-pressed sintering in a vacuum is termed in situ transformed polyacrylonitrile-based (PAN-based) carbon fibers, and the fibrous precursors are the pre-oxidized PAN fibers. The properties and structure of in situ transformed PAN-based carbon fibers are investigated by Nano indenter, SEM, TEM, XRD, and Raman. The results showed that the microstructure of the fiber surface layer was compact, while the core was loose, with evenly-appearing microvoids. The elastic modulus and nanohardness of the fiber surface layer (303.87 GPa and 14.82 GPa) were much higher than that of the core (16.57 GPa and 1.54 GPa), and its interlayer spacing d002 and crystallinity were about 0.347 nm and 0.97 respectively. It was found that the preferred orientation of the surface carbon layers with ordered carbon atomic arrangement tended to be parallel to the fiber axis, whereas the fiber core in the amorphous region exhibited a random texture and the carbon atomic arrangement was in a disordered state. It indicates that the in situ transformed PAN-based carbon fibers possess significantly turbostratic structure and anisotropy. |
topic |
in situ transformed PAN-based carbon fibers turbostratic structure carbon layer carbon atomic arrangement |
url |
http://www.mdpi.com/1996-1944/11/6/1017 |
work_keys_str_mv |
AT jingjingcao propertiesandstructureofinsitutransformedpanbasedcarbonfibers AT wenwuzhao propertiesandstructureofinsitutransformedpanbasedcarbonfibers AT shuzhengao propertiesandstructureofinsitutransformedpanbasedcarbonfibers |
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