Electrical Conductivity of Carbon Fiber Filled Epoxy Resin Composites Molded by Using Centrifugal Force.

Abstract

The sample of epoxy resin filled with chopped carbon fibers was prepared by using centrifugal force in order to make the functionally gradient materials. The fiber content gradient measured by density of samples in the direction of centrifugal force was affected by aspect ratio of fibers and the magnitude of centrifugal force, The volume resistivity of samples was measured by the parallel plate electrodes and by the four-probe method in both directions parallel and perpendicular to the direction of centrifugal force. The values of volume resistivity perpendicular to the direction of centrifugal force was less scattered and lower than those parallel to the centrifugal force direction. The volume resistivity of samples was also affected by aspect ratio of fibers and the magnitude of centrifugal force. The samples show the volume resistivity less than 107 ohm-cm by both methods. It was confirmed by scanning electron microscopic observation that most of fibers aligned perpendicular to the direction of centrifugal force. The results indicated that the conductive composites with the fiber content gradient was prepared by using centrifugal force.

Investigations on mechanical and sliding wear behaviour of short fibre-reinforced vinylester-based homogenous and their functionally graded composites

“…3,4 Several material scientists and research scholars worked on functionally graded composite materials prepared via centrifugation technique using thermosetting resin-based polymer matrix like graphite-reinforced-epoxy graded composites. [5][6][7][8][9][10][11][12][13] The preparation of functionally graded composite material via centrifugation technique (a category of wet powder metallurgy) reported to be effective in producing continuous gradient. 9 Chand and Sharma 10 studied sliding wear behaviour of milled carbon fibre-reinforced epoxy gradient composites prepared via centrifugation technique; according to them improved wear resistance is observed for casting prepared at highest 1100 r/min, because of effective compaction of milled carbon fibre around the outer surface periphery.…”

“…[5][6][7][8][9][10][11][12][13] The preparation of functionally graded composite material via centrifugation technique (a category of wet powder metallurgy) reported to be effective in producing continuous gradient. 9 Chand and Sharma 10 studied sliding wear behaviour of milled carbon fibre-reinforced epoxy gradient composites prepared via centrifugation technique; according to them improved wear resistance is observed for casting prepared at highest 1100 r/min, because of effective compaction of milled carbon fibre around the outer surface periphery. They also investigated 11 the tribological behaviour of ultra-high-molecular-weight polyethylene (UHMWPE) filled epoxy gradient composites prepared via centrifugation technique and reported that effective gradient distribution is obtained via centrifugation method where distribution of UHMWPE particulate in epoxy matrix remains the function of centrifugation time.…”