A Comparison of the Interfacial, Thermal, and Ablative Properties between Spun and Filament Yarn Type Carbon Fabric/Phenolic Composites

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Park, Jong Kyoo; Cho, Donghwan; Kang, Tae Jin
Issue Date
Carbon 2004;42:795-804
Carbon compositesCarbonizationThermal analysisInterfacial properties, Thermal conductivity
In the present paper, the interfacial, thermal, and ablative properties of phenolic composites reinforced with spun yarn type
carbon fabrics (spun C/P composite) and filament yarn type carbon fabrics (filament C/P composite) heat-treated at 1100 C have
been extensively compared. The interlaminar shear strength, crack growth rate, and fracture surface were studied to evaluate the
interfacial characteristics of the composites using short-beam shear test, double cantilever beam test, and scanning electron
microscopy, respectively. The thermal conductivity and the coefficient of thermal expansion were also measured in the longitudinal
and transverse directions, respectively. To explore the ablative characteristics of the composites in terms of insulation index, erosion
rate, and microscopic pattern of ablation, an arc plasma torch was used. The interfacial properties of the spun C/P composite are
significantly greater than those of the filament C/P composite, with qualitative support of fracture surface observations. It has been
investigated that the presence of protruded fibers in the phenolic matrix of the spun C/P composite may play an important role in
enhancing the properties due to a fiber bridging effect. The longitudinal thermal conductivity of the spun C/P composite is about 7%
lower than that of the filament C/P counterpart. It has been found from the ablation test using arc plasma torch flame that the
erosion rate is 14% higher than that of the filament C/P counterpart. Consequently, all the experimental results suggest that use of
spun yarn type carbon fabrics heat-treated at low carbonization temperature as reinforcement in a phenolic composite may significantly
contribute to improving the interfacial, thermal, and ablative properties of C/P composites.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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