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탄소 단섬유를 소량 첨가한 천연 흑연-메조페이스 핏치 복합재료의 이방성
Anisotropic Properties of Natural Graphite-Mesophase Pitch Based Composites Containing Chopped Carbon Fiber in Low Concentration
HWAHAK KONGHAK, April 1988, 26(2), 205-211(7), NONE
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Abstract
천연 흑연 분말과 핏치 precursor 혼합물에 1-2 %의 탄소 단섬유를 첨가하고 압출하여 열이방성 복합재료를 성형하였다. 이 초벌 성형품을 530 ℃까지 안정화시키고 1,000 ℃까지 탄화시켰다.
탄소 단섬유는 압출시에 축방향으로 배열하였으며, 보강재와 결합재 사이의 결합력을 증가시켰다. 그러므로 인장 강도, 탄성 계수, 굴곡 강도 등과 같은 복합재의 기계적 물성이 증가되었으며, 축방향은 반경방향보다 2-3배 더 증가하였다. 그리고 2 %의 탄소 단섬유를 첨가한 경우 0-400 ℃ 범위에서 축방향으로의 열전도도는 반경 방향으로 보다 12-20배가 되었으며, 이 복합재의 전열 이방성 계수는 탄소 단섬유의 첨가량 등에 의하여 조절될 수 있었다.
탄소 단섬유는 압출시에 축방향으로 배열하였으며, 보강재와 결합재 사이의 결합력을 증가시켰다. 그러므로 인장 강도, 탄성 계수, 굴곡 강도 등과 같은 복합재의 기계적 물성이 증가되었으며, 축방향은 반경방향보다 2-3배 더 증가하였다. 그리고 2 %의 탄소 단섬유를 첨가한 경우 0-400 ℃ 범위에서 축방향으로의 열전도도는 반경 방향으로 보다 12-20배가 되었으며, 이 복합재의 전열 이방성 계수는 탄소 단섬유의 첨가량 등에 의하여 조절될 수 있었다.
Thermal anisotropic composites were fabricated by extrusion of natural graphite powder-pitch precursor mixture, to which 1-2 wt% of chopped carbon fiber was added. The extruded green body was stabilized in an autoclave up to 530 ℃ and carbonized up to 1,000℃. Chopped carbon fibers were aligned along the longitudinal direction by extrusion, and contributed to the enhancement of interfacial adhesion between filler and binder.
Therefore, the mechanical properties such as tensile strength, E-modulus, and flexural strength of composites were increased. Especially the properties of longitudinal direction were increased two or three times than those of transverse direction due to the alignment of chopped carbon fiber.
The thermal conductivity of longitudinal direction was about 12-20 times larger than that of transverse direction in the temperature range of 0-400 ℃ by adding 2 wt% chopped carbon fiber, and the thermal anisotropic factor of composites were varied on the amount of chopped carbon fiber added.
Therefore, the mechanical properties such as tensile strength, E-modulus, and flexural strength of composites were increased. Especially the properties of longitudinal direction were increased two or three times than those of transverse direction due to the alignment of chopped carbon fiber.
The thermal conductivity of longitudinal direction was about 12-20 times larger than that of transverse direction in the temperature range of 0-400 ℃ by adding 2 wt% chopped carbon fiber, and the thermal anisotropic factor of composites were varied on the amount of chopped carbon fiber added.
