| To investigate the effects of graphite contents on the mechanical and vibration damping properties, through manufacturing Al/Gr. composites by compacting and extruding Al and graphite powders, rolling its specimen up to 80%, and testing the specimen for its hardness, tensile strength, vibration damping, etc. The followings are the results as; microstructure observation showed that the Al/Gr. composites are uniformed distribution, which means its adequacy for composites. When Al/Gr. composites was rolled, the graphite shape was modified to plate shape at the parallel side to the rolling direction. According to the result of hardness tests on graphite, the more the graphite content and the smaller the rolling ratio, the less the hardness. The result of tensile strength tests show that the tensile strength increase as the graphite content deceases or the rolling ratio increases. The more the graphite content or the smaller the rolling ratio, the bigger the vibration damping coefficient. When Al contains graphite up to 15%, the tensile strength decreases by 27%, whereas, the vibration damping coefficient increases by 80%, which means inverse proportional relationship between the two. |
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