摘要
采用机械合金化(MA)工艺,以W-25%CuO为原料,球磨参数设置为:球料比20∶1、球磨转速500r/min,球磨时间范围1～40h,采用球磨20min、空气冷却30min的循环球磨方式。对不同球磨时间条件下制备的粉末进行了X射线衍射和透射电镜分析。结果表明,通过MA工艺可在较短时间内(1h)获得W-Cu纳米晶粉末,球磨时粉体中的CuO发生了还原,部分W被氧化成WOx(x=2～3),球磨后W粉的平均晶粒尺寸为12.5nm左右,最小晶粒5～6nm;W粉颗粒的最终形态为球形,并被Cu所包覆。
W-Cu nano-crystalline composite precursor powders are fabricated by mechanical alloying （MA） at the following conditions of ball milling： with a ball powders ratio of 20：1; at a rotation speed of 500 r/min for milling time of lh to 40 h; and by ball milling for 20 min and air-cooling for 30 min. The analyses and investigations were carried out on the powders milled for different times by using X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The experiment results show that the nano-structural powders were synthesized by mechanical alloying in a short time of lh under above conditions. During ball milling, CuO powders were reduced by W, part of W powders were oxidized into WOx （x=2-3）. The average grain size of W particles with a spherical shape and coated by Cu is about 12.5 nm, even to a minimal value of 5-6 nm after ball milling.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第6期1091-1094,共4页
Rare Metal Materials and Engineering
基金
航空科学基金(04H52061)资助
