Microstructure difference between core and skin of T700 carbon fibers in heat-treated carbon/carbon composites

Zhou, Gengheng; Liu, Yequn; He, L. L.; Guo, Quangui; Ye, Hengqiang

doi:10.1016/j.carbon.2011.02.025

Cited by 96 publications

(38 citation statements)

References 22 publications

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“…Because of the greater and stiffer graphitic crystals and the reduction of interlayer spacing, the void size increases. A general decrease of micro porosity in the fibre structure with a pronounced development of voids in the fibre skin structure opposite to the core is observed .…”

Section: Process‐structure‐relations and Their Technical Potentialsmentioning

confidence: 86%

“…Temperatures of 1400 °C and above result in graphitic fibres with less content of nitrogen or hydrogen . Because the highly graphitic carbon fibres is formed by the temperature increase, crystallite thickness size and orientation increases and the interlayer spacing between the single graphene planes are reduced . The enhanced crystal growth is different for the single crystallite dimensions.…”

Section: Process‐structure‐relations and Their Technical Potentialsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of processing parameters on the properties of carbon fibres – an overview

Jäger

Cherif

Kirsten

et al. 2016

Materialwissenschaft Werkst

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Several studies have shown the importance of carbon fibres (CF) for different high technology markets. In recent years, different fibre types with improved properties have been developed for those markets. Polyacrylonitrile (PAN) copolymers are the basic raw material (precursor) for these fibres in the predominant case. Improvements of the mechanical fibre properties have mainly been achieved by defect reduction during the manufacturing process. Thus, commercial carbon fibres with tensile strengths up to approx. 7000 MPa are currently available. It can be shown that the strengths can be further increased (in the direction of graphene properties) when the relationship between process conditions and defects due to manufacturing of the fibres is better understood. In this context, novel processes like electron beam crosslinking or UV‐activation have proven to be very promising. The article gives an overview about the current situation in the field of carbon fibres development and particularly shows recent shortcomings with respect to novel applications.

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Section: Process‐structure‐relations and Their Technical Potentialsmentioning

confidence: 86%

Section: Process‐structure‐relations and Their Technical Potentialsmentioning

confidence: 99%

Influence of processing parameters on the properties of carbon fibres – an overview

Jäger

Cherif

Kirsten

et al. 2016

Materialwissenschaft Werkst

View full text Add to dashboard Cite

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“…El-Bakary and Ali [17] reported the optical and geometrical properties of fibers with skin-core structure. Zhou et al [18] studied the microstructure difference between core and skin of T700 carbon fibers in heat-treated carbon/carbon composites.…”

Section: Introductionmentioning

confidence: 99%

Wide-angle X-ray diffraction investigation on crystallization behavior of PA6/PS/SEBS-g-MA blends

et al. 2012

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Blends of polystyrene/polyamide 6 (PS/PA6) compatibilized by styrene-ethylene/butylene-styrene (SEBS) elastomer grafted with maleic anhydride were prepared by melt blending. Wide-angle X-ray diffraction (WAXD) scans indicated a skin-core structure formed in the specimens during the injection-molding process. The results showed that the specimens tended to form the α-crystalline form in the core region, but the γ-crystalline form in the skin region. The influences of PS and SEBS-g-MA on the crystallization of PA6 were different in the core region and skin region. In the core region, PS made the PA6 tend to be in the γ-crystalline form, but the influence of PS was contrary in the skin region. SEBS-g-MA had both enhancement and toughening effects on the blends. The mechanical properties of the blends were determined by the combined action of the two aforementioned factors.

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“…The most popular methods to determine microcrystalline structure of carbon materials are Raman spectroscopy [5−7] , X-ray diffraction (XRD) [5,8] , and transmission electron microscopy (TEM) [4,9] . With the development of the technology of small angle X-ray scattering (SAXS) [10,11] , theory and method using SAXS for the characterization of the microvoids in carbon fibers have also been established and developed in the last twenty years [10, 12−15] .…”

Section: Introductionmentioning

confidence: 99%

Effects of ultra-high temperature treatment on the microstructure of carbon fibers

Kang

et al. 2017

Chin J Polym Sci

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The microcrystalline structure and microvoid structure in carbon fibers during graphitization process (2300−2700 °C) were characterized employing laser micro-Raman scattering (Raman), X-ray diffraction (XRD), small angle X-ray scattering (SAXS), and high-resolution transmission electron microscopy (HR-TEM). The crystalline sizes (La, Lc) increased and interlayer spacing (d002) decreased with increasing heat treatment temperature (HTT). The microvoids in the fibers grew up and contacted to the neighbors with the development of microcrystalline. In addition, the preferred orientation of graphite crystallite along fiber axis decreased and microvoids increased. The results are crucial for analyzing the evolution of microstructure of carbon fibers in the process of heat treatment and important for the preparation of high strength and high modulus carbon fibers.

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Microstructure difference between core and skin of T700 carbon fibers in heat-treated carbon/carbon composites

Cited by 96 publications

References 22 publications

Influence of processing parameters on the properties of carbon fibres – an overview

Influence of processing parameters on the properties of carbon fibres – an overview

Wide-angle X-ray diffraction investigation on crystallization behavior of PA6/PS/SEBS-g-MA blends

Effects of ultra-high temperature treatment on the microstructure of carbon fibers

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