摘要
以钨酸钠(Na2WO4·2H2O)和硝酸铜[Cu(NO3)2·3H2O]为原料,采用水热合成法制备W-Cu复合粉,计算在不同pH值条件下水热合成W-Cu复合粉的回收率,并对制取W-Cu复合粉前驱体的过程进行热力学分析。采用XRD、SEM、EDS和TEM对所制备W-25Cu复合粉的物相、形貌和微观组织进行表征。结果表明:在不同溶液浓度和pH值下的离子回收率不同。当钨酸钠浓度为0.6mol/L,硝酸铜浓度为0.578 6mol/L且pH值为5.5时,离子以CuWO4·2H2O形式析出,溶液中离子的回收率达到99%以上。水热合成产物具有分散性好,粒度均匀,大小为15~20nm。经500℃煅烧、800℃氢还原60min,得到了W和Cu元素分布均匀的W-Cu复合粉,具有近球形的W包覆Cu结构,粒度为100~200nm。
W-Cu composite powders were prepared by hydrothermal synthesis with sodium tungstate and cupric nitrate as the raw materials.The recovery rate was calculated of W-Cu composite powders prepared at different pH.Preparation process of the precursor of W-Cu composite powders was analyzed based on thermodynamics.Phase composition,morphology and microstructure of the prepared W-Cu composite powders were characterized by XRD,SEM,EDS and TEM.The results show that the recovery rates of W and Cu ions are different at different solution concentration and pH value.When sodium tungstate concentration is 0.6mol/L,cupric nitrate concentration is 0.578 6 mol/L and the pH value is 5.5,W and Cu ions precipitate in the form of CuWO4·2H2O,and their recovery rates are more than 99%.The product of hydrothermal synthesis has good dispersivity and uniform particle size of 15~20nm.After calcined at 500℃and reduced with hydrogen at 800℃for 60 min,W-Cu composite powders are obtained with well-distributed W and Cu elements,subglobose microstructure of W-covered Cu and particle size of 100~200nm.
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2015年第5期16-21 29,29,共7页
Rare Metals and Cemented Carbides
基金
河南省重点科技攻关项目(11110091050)
河南省教育厅自然科学研究项目(2010A430004)
关键词
W-Cu复合粉
水热合成
回收率
热力学分析
W-Cu composite powder
hydrothermal synthesis
recovery rate
thermodynamic analysis
