摘要
以H2WO4和CuSO4·H2O(W:Cu=70g:30g)为原料,采用化学共沉淀方法制备W-Cu化合物粉末,其反应条件为:反应温度25℃±1℃,pH值5.0-5.2,陈化时间8h±1h。设计了封闭循环氢还原系统,用此系统进行氢气热还原,不仅使氢气得到充分利用,而且容易判断反应终点。通过系统内的特殊装置除水,降低了还原温度,在600℃下还原得到W和Cu混合均匀的复合粉。其粒径小于70nm。
Tungstic acid and cupric sulfate (W : Cu = 70:30) were used as precursor with particle size of 6.71 gm to prepare the W-Cu composite by using chemical coprecipitation. The reaction conditions were reacting temperature of 25 degrees C +/- 1 degrees C, PH value of 5.0 similar to 5.2, and ageing time of 8 h +/- 1 h. A special seal reduction system was designed with a high hydrogen utilization ratio and easy to judge the destination of reaction, in which water can be removed due to the lower reaction temperature. The superfine and homogenous W-Cu composite powders with the particle size less than 70 nm can be prepared by the hydrogen reduction at 600 degrees C.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2005年第6期966-969,共4页
Rare Metal Materials and Engineering
基金
辽宁省自然科学基金资助项目(002054)
关键词
W
CU
W-Cu复合粉
纳米
封闭循环氢还原
化学共沉淀
copper
tungsten
W-Cu composite powder
nanocrystalline
seal circulatory hydrogen reaction
chemical coprecipitation
