激光辐照石墨-镍悬浮液制备碳包覆颗粒的研究  

Research on the synthesis of carbon coated particles by laser ablation in the graphite-nickel suspension

作　　者：孙景[1] 张梅梅[1] 牛凯阳[1] 胡胜亮[1] 田飞[1] 林奎[1] 杜希文[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《粉末冶金技术》2008年第4期273-276,共4页Powder Metallurgy Technology

基　　金：天津市自然科学基金重点项目(06YFJZJC01200)

摘　　要：用球磨机湿法球磨微米级镍粉和石墨制备石墨与镍的悬浮液,然后用脉冲激光辐照。用扫描电镜、X射线衍射和透射电镜等对球磨和激光辐照后的产物进行表征。结果表明:球磨细化了镍粉,并使镍粉和石墨混合均匀,使其可悬浮于水介质中;然后激光辐照悬浮液得到了细小的碳包覆镍纳米颗粒。通过对碳包覆颗粒形成机制的初步探索,认为激光作用会使镍和碳气化并形成镍碳混合蒸气,在脉冲过后的冷却过程中碳和镍碰撞溶解,而温度的不断降低会促使过饱和的碳从镍中析出,从而形成包覆,获得了细小的碳包覆颗粒。The graphite and nickel suspension were prepared by ball-milling the mieropartieles of graphite and nickel in liquid media. And carbon-coated nickel particle （CENP） were synthesized by millisecond-pulse laser irradiating in the suspension, the formation mechanism was also discussed and investigated. SEM, XRD, TEM were used to characterize the ball-milled and laser-ablated products. The results show that, through ball-milling suspension is obtained, when irradiating the suspension by laser, nickel and graphite will be evaporated synchronously, during cooling, carbon is precipitated from the solidified particle and forms a shell.

关 键 词：球磨 脉冲激光 石墨-镍悬浮液 碳包覆颗粒 

分 类 号：TQ127.11[化学工程—无机化工] TN215[电子电信—物理电子学]