Effect of Structure on the Mechanical Properties of PAN-Based Carbon Fibers during Graphitization

Hao Xiao; Yong Gen Lu; Xian Ying Qin; Ya Wen

doi:10.4028/www.scientific.net/MSF.686.770

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Preparation and Characterization of Carbon Fibre Reinforced Aluminium Matrix Composite
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A New Sand Casting Process with Accelerated Solidification Rate
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Effect of Structure on the Mechanical Properties of PAN-Based Carbon Fibers during Graphitization
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Preparation of Polyacrylonitrile High Modulus Carbon Fibers by Catalytic Graphitization Using Boron
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Characterizations of UV Aging and Atmospheric Corrosion on Epoxy Coated 7A04 Aluminum Alloy
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Research and Classification of Inflatable Space Vehicle and its Materials
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HomeMaterials Science ForumMaterials Science Forum Vol. 686Effect of Structure on the Mechanical Properties...

Effect of Structure on the Mechanical Properties of PAN-Based Carbon Fibers during Graphitization

Abstract:

An investigation was conducted to determine the influence of high temperature treatment from 1600°C to 2800°C under stretching stress of 10MPa on PAN-based carbon fiber structure and physical properties. The tensile strength of fibers decreased from 4.5GPa to 2.97GPa with increasing treatment temperature up to 2800°C，while the modulus of fibers increased from 230GPa to 375GPa The texture in the longitudinal surface of fibers through heat treatment was characterized using a scanning electron microscopy. The contours of fiber surface became accidented with gaps becoming deeper as temperature increased. It has been observed that both the crystallite sizes (L_a, L_c) and the degree of preferred orientation increasd, while the crystallite interlayer spacing (d₀₀₂) decreased by X-ray diffraction analysis with increasing heat-treatment temperature. The total porosity of fibers decreased from 21.01% to 15.09% and while the density of fibers increased from 1.720g/cm^-3 to1.886 g/cm^-3 with increasing heat-treatment. In addition, the relationship between mechanical properties and structure of variants was also explored in detail.