| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系 === 94 === This study used dry particle coating technology to produce a composite of graphite powder by coating its surface with nano-nickel. Coating was done by Mechanofusion System. It investigated the effect of Mechanofusion operating conditions (graphite-Ni mass rate, the speed of rotary chamber, and operating time) on the graphite-nano Ni composite powder. The composite samples are characterized by means of scanning electron microscopy (SEM), laser particle size analyzer, and X-ray diffraction. SEM images indicate that the shape of composite powder is smoother, and that the nano-Ni is spread more evenly over the graphite surface when the speed and time are increased. The optimal condition was obtained, that the composite powder is smoothest and nano-Ni is spread most evenly when speed is 4000 rpm and operating time is 45 min. It is determined, by laser particle size analyzer, that the volume-ration of composite powder between 20 ~ 25 μm, increased when the speed and time are increased. The nano-Ni coating layer of Test B (graphite-Ni mass rate 100:2) is thicker than that of Test A (100:1), according to XRD analysis.
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