纳米CeO_2/Ni60复合粉末的高能球磨法制备及其表征

Preparation and characterization of CeO_2/Ni60 nanocomposite powder with high-energy ball milling

以Ni60粉末和纳米CeO_2颗粒为原料,在氩气保护下采用高能球磨工艺制备了纳米CeO_2/Ni60复合粉末,并利用扫描电镜、X射线衍射和激光粒度分析仪等方法,对复合粉末的形貌、晶粒大小、微观应变及粒度分布进行表征和分析.结果表明:在球磨转速为350r/min,球料比为10∶1的条件下,随着球磨时间的延长,Ni60粉末晶粒不断细化,纳米CeO_2团聚体逐渐解聚,当球磨时间为10h时,纳米CeO_2颗粒均匀弥散分布在Ni60基体上,形成层片状复合粉末;经10h球磨后复合粉末的晶粒尺寸和微观应变分别为27.9nm和0.32%,并在球磨10h后,二者的变化趋于稳定.

Taking Ni60 powder and CeO2 nano-particles as raw materials and argon gas as protective medium,the CeO2/Ni60 nanocomposite powder was prepared with high-energy ball milling process and morphology,grain size,microstrain,and particle size distribution of the nanocomposite powder were characterized and analyzed with scanning electron microscope（SEM）,X-ray diffraction（XRD）,and laser particle size analyzer.The result showed that under the condition of milling speed of 350 r/min and a ball-to-powder ratio of 10∶1,the grain size of Ni60 powders would decrease with the ball-milling time,agglomerative CeO2 nanoparticles would gradually be disintegrated,and after milling for 10 h,the CeO2 nanoparticles would homogeneously be distributed on the surface of Ni60 matrix and form a layered nanocomposite powder,the average grain size and microstrain of the nanocomposite powder being 27.9 nm and 0.32%respectively,and the change of the two parameters would tend to be stable.