纳米NiO/CNTs制备及其对镁合金组织性能的影响  

Preparation of NiO/CNTs and its Effects on Microstructure of Mg Alloy

作　　者：刘震云[1] 曾效舒[1] 罗雷[1] 邬胜伟[1] 魏嘉麒[1] 

机构地区：[1]南昌大学机电工程学院

出　　处：《特种铸造及有色合金》2014年第11期1162-1165,共4页Special Casting & Nonferrous Alloys

摘　　要：以硫酸镍、氨水和CNTs为原料,采用直接沉淀法在CNTs沉积NiO,经450℃热分解得到NiO/CNTs材料,对所得试样进行了扫描电镜(SEM)、透射电镜(TEM)、X射线衍射分析(XRD)表征,并将其加入到镁合金中。结果表明,采用直接沉淀法制备的纳米NiO可以很好地附着在CNTs上。当NiO含量为33%时,NiO可以均匀地包覆CNTs,NiO颗粒尺寸平均为20nm,并且没有发生团聚,分散效果良好。与直接加入CNTs相比,包覆NiO的CNTs更容易加入镁合金基体中,使得晶粒更细小,硬度也相应更高。Nickel hydroxide was deposited on the surface of modified carbon nanotubes （CNTs） by im- proved precipitation process with nickel sulfate and ammonia as well as CNTs as raw materials, and NiO/CNTs composites were obtained by thermo-decomposition at 450 ℃. Properties and microstructure of the NiO/CNTs composites with different carbon nanotubes were examined by scanning electron mi- croscopy （SEM）, X-ray diffraction（XRD） and transmission electron microscopy（TEM）. Then NiO/ CNTs powder was added to Mg-Zn alloy. The results indicate that nano nickel oxide prepared by homo- geneous precipitation method can adhere with carbon nanotubes well. With 33% nickel oxide,carbon nanotubes can be coated by nano nickel oxide uniformly,and the average diameter of nickel oxide parti- cles reaches 20 nm with absence of agglomeration and acceptable disperserdly distrbution. Compared with adding carbon nanotubes directly, carbon nanotubes coated nickel oxide are more easily to be added into magnesium-zinc alloy, which can refine grain size and improve hardness of the composites.

关 键 词：CNTS NIO 直接沉淀法 镁合金 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TG146.22[金属学及工艺—金属材料]