Friction-wear Characterization and Fabrication of Carbon/Carbon Composite via Mesophase Pitch

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J. Korean Ceram. Soc. > Volume 35(9); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(9): 974.

메조페이스 핏치계 탄소/탄소 복합재료의 제조 및 마찰 마모특성

박종규, 이진용, 하헌승, 임연수¹, 이승구²

국방과학연구소
¹명지대학교 무기재료공학과
²충남대학교 섬유공학과

Friction-wear Characterization and Fabrication of Carbon/Carbon Composite via Mesophase Pitch

ABSTRACT

This study is concerned with the production of carbon fiber reinforced carbon(C/C) with polyaromatic mesophase pitch as matrix precursor and with the investigation of friction-wear characteristics in ambient air using a constant speed type of friction tester. The main problem in using the polyaromatic mesophase as the matrix precursor is the high viscosity which may limit the complete impregnation of the fiber preform in the vacuum. To solve these problems two dimensional carbon fiber fabrics were infiltrated with meso-phase pitch in the pitch impregnator. After the impregnation and the heat treatment process. C/C com-posites were characterized by density porosity to monitor the influence of high pressure and temperature. It showed that the bulk density was increased and the apparent porosity and the density increasing rate was reduced as repeating the impregnation the carbonization and the heat treatment. The friction-wear charac-teristics of C/C composites were investigated by measuring the average friction coefficient and the specific wear rate as functions friction speed and friction pressure using a constant speed type of friction tester. C/C composite4s showed the average friction coefficient to be reduced as increasing the friction speed and the friction pressure.

Key words: Mesophase pitch, Carbon/carbon composite, Friction coefficient, Specific wear rate