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오인석(In Seok Oh),인세진(Se Jin In),최돈묵(Don Mook Choi),이영석(Young Seak Lee),김정일(Jung Il Kim),주혁종(Hyeok Jong Joo) 대한공업교육학회 2000 대한공업교육학회지 Vol.25 No.1
The 4D preforms were made of both weaving and rod network types. Densified 4D CFRC was fabricated with coal tar pitch matrix through the process of pressure impregnation and carbonization(PIC). Each preform type was compared with combustion and thermal properties of 4D CFRC and investigated. In case the high heat treatment was up to 2300℃, the oxidation resistance of 4D CFRC was much increased. As a result of combustion test, the ablation resistance of 4D CFRC rose with the growing of density and heat treatment temperature(HTT). Therefore, to obtain better ablation resistance under the worse conditions such as high temperature, high HTT and densification are essential parameters.
납사분해 잔사유 및 콜타르 핏치로부터 중공형 탄소섬유의 제조 및 특성
이영석,인세진,오인석 順天大學校 1998 論文集 Vol.17 No.1
Hollow carbon fibers(HCFs) are produced from pitches which are isotropic and anisotropic(mesophase) through two cylinder annular type spinnerette specially designed to obtain hollow fibers. The amount of N₂ flowing inside of spinnerette decides both thickness of fiber and the surface area, which are affected by temperature and the winding velocity. The thicker the isotropic and mesophase pitch-based fibers are, the longer the oxidation time is, and the thinner, the shorter, however, they are easily broken. Mesophase pitch-based HCFs were oriented along the line corresponding with maximum velocity during melt spinning. It was concluded that a pitch precursor could be melt-spun, and produced uniformly into hollow carbon fibers if the spinning temperature, stabilization, and carbonization conditions were well controlled. In comparision the results of tensile testing with normal round CFs, the mechanical properties of HCFs were improved except tensile strength of isotropic HCFs.