摘要
首先采用高浓度湿磨法制备超细WO3-CuO混合粉末,800℃空气中焙烧90min后得到CuWO4-WO3前驱体粉末,再通过氢气还原获得超细W-Cu复合粉末。将该复合粉末与直接还原超细WO3-CuO混合粉末所得的W-Cu复合粉末进行对比,并研究还原温度对W-Cu复合粉末的微观形貌、成分与粒度的影响。结果表明:经过30h高浓度湿磨,WO3-CuO混合粉末的中位径由44.88μm降至0.28μm,焙烧后得到的CuWO4-WO3粉末平均粒径小于0.7μm且分散良好。由CuWO4-WO3还原获得的W-Cu复合粉末细小、分散均匀,还原温度对其形貌影响不大,由WO3-CuO混合粉末直接还原得到的W-Cu复合粉末由大量W-Cu纳米颗粒构成,随还原温度升高,纳米W-Cu颗粒逐渐长大。
Ultrafine W-Cu composite powders were prepared by hydrogen reduction of CuWO4-WO3 precursors which calcined at 800℃ for 90min from concentrated wet ball milled WO3-CuO powder mixtures. The W-Cu composite powders reduced from different precursors were compared, and the effect of reduction temperature on the morphology, components and particle size of W-Cu composite powders was investigated. Results show that the median size of WO3-CuO powder mixtures decreases from 44.88 to 0.28μm with the milling time of 30 h. The CuWO4-WO3 precursors disperse well with mean particle size less than 0.7μm. The W-Cu powder reduced from CuWO4-WO3 precursors is fine and highly dispersed, and the reduction temperature has less effect on its morphology. The W-Cu powder reduced directly from WO3-CuO powder mixtures is composed by much W-Cu nano-composite particles, and the particles grow with increasing reduction temperature.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2014年第6期903-908,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51274246)
中南大学粉末冶金国家重点实验室开放课题
关键词
湿磨
粒度分布
钨铜纳米粉末
还原温度
wet ball milling
particle size distribution
W-Cu nano-composite powders
reduction temperature
