以乾式粉体复合技术之机械融合设备制备石墨奈米镍复合粉体之研究.DOC

以乾式粉體複合技術之機械融合設備製備石墨-奈米鎳 複合粉體之研究 The Processing of Graphite-Nano Ni Composite Powder Using Dry Particle Coating-Mechanofusion System 研究生：陳順興 Chen, Shun-Hsing 指導教授：周春禧 Chou, Chuen-Shii 【摘要】 本研究以乾式粉體複合技術之機械融合設備（Mechanofusion System）製備石墨-奈米鎳複合粉體，探討製程參數：石墨與奈米鎳重量比例、旋轉腔體轉速、融合時間，對石墨-奈米鎳複合顆粒產物之影響。研究結果指出：（1）由掃瞄式電子顯微鏡（SEM）觀察得知，複合粉體之形狀與複合粉體之複合情形，隨旋轉腔體之轉速提高，與融合時間之延長，其形狀將被修飾成平整光滑之球體，於複合粉體表面形成細緻之奈米鎳微粒複合層，但當轉速過高將造成複合粉體之內應力增加，形成波浪狀之複合層。由本研究可得最佳化之操作參數為，旋轉腔體轉速4000 rpm與融合時間45分鐘，可製備較為平整光滑球體之形狀，且具細緻之奈米鎳微粒複合層之複合粉體。（2）藉由雷射粒徑分析儀應用得知，隨旋轉腔體之轉速提高，與融合時間之延長，複合粉體粒徑於20-25 μm所佔之體積百分比將隨之增加。（3）經XRD繞射分析推論，石墨與奈米鎳重量比例為100:2所製備之複合粉體之奈米鎳複合層，較重量比例100:1所製備之複合粉體的奈米鎳複合層為厚。 關鍵字：乾式粉體複合技術、機械融合、石墨、奈米鎳 【Abstract】 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. Keywords：Dry Particle Coating, Mechanofusion, Graphite, Nano-Nickel