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J. Korean Ceram. Soc. > Volume 34(4); 1997 > Article
Journal of the Korean Ceramic Society 1997;34(4): 380.
Alumina/graphite 복합체의 마찰마모 특성
백용혁, 정종인1, 박용갑2, 김주영
전남대학교 무기재료공학과
2선문 대학교 재료공학과
Tribological Properties of Alumina/Graphite Composites
The tribological properties of ceramics are very important in the application to engineering ceramic parts such as seal rings, pump parts, thread guides, and so on. In this study, the effects of graphite addition on the mechanical and tribological properties of alumina/graphite composites were investigated. The composites were prepared by the adding of graphite powder to the mixture of Al2O3, talc and calcium carbonate. Bending strength, water absorption, friction coefficient, the amount of worn out material at a certain time, and maximum surface roughness(Rmax) of the prepared composites were measured. Crystalline phases and microstructure were examined with XRD and SEM. The melt of Al2O3-CaO-MgO-SiO2 system was shown over 10 vol% graphite composition. As the amount of the graphite is increased, needle like crystals of mullite were formed and grown. We obtained the good properties of friction coefficients and wear resistance at the powder composition containing 15 vol% of graphite.
Key words: Tribological properties, Maximum surface roughness(Rmax), Friction coefficient, Wear resistance
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