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Journal of the Korean Ceramic Society 1998;35(7): 740. |
| 콜타르 핏치를 이용하여 제조된 탄소/탄소 복합재의 관성제동 마찰특성 |
| 이진용, 서동수, 임연수1, 이승구2, 박종규3 |
충남대학교 재료공학과
1명지대학교 무기재료공학과
2충남대학교 섬유공학과
3국방과학연구소 |
| The Inertia Friction properties of the Carbon/Carbon Composites Manufactured Using a Coal-tar Pitch |
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| ABSTRACT |
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The inertia friction properties of C/C composites manufactured by the processes of pressure and at-mospheric carbonizaton with a commerciallized and two kinds of modified coal-tar pitch as a matrix pre-cursor were investigated. The modifications of a pitch such as the introduction of mesophase and the ad-dition of sulphur into a raw pitch were not effective for a impregnation efficiency conducted in a vacuum and at the same time in a pressure of 5kg/cm2 due to the increase of the pitch viscosity. There was not a difference in the densification increment between the pitch modifications however it was revealed that a pressure carbonization was more advantageous than an atmospheric in the densification and the formation of anisotropic carbon matrix. The friction and wear propertis of C/C having higher degree of matrix cry-stallization higher density and hardness of friction surface showed superiority. As the braking energy was increased the friction coefficients were decreased and reached almost same level at the high kinetic energy of 99.6kJ. The wear trends at 99.6kJ were different from the behaviors of friction ceofficient under the same energy in which an oxidation wear is being considered along with a mechnical wear although the wear rates were almost similar to the friction coefficient at the low energy. |
| Key words:
Coal-tar pitch, C/C composites, Inertia friction test, Friction coefficient, Wear rate |
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