纳米钨铜复合粉末的制备及其烧结行为研究  

Research on Preparation of W-Cu Nanocomposite Powders and their Sintering Behaviors

作　　者：刘舒[1] 谢敬佩[1] 马窦琴[2] 王凤梅[1] 王爱琴[1] 李继文[1] 王文焱[1] 孙浩亮[1] 王维[1] 程光耀[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《稀有金属与硬质合金》2014年第5期34-38,47,共6页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金(51371077)

摘　　要：以钨酸钠和硝酸铜为原料,采用水热合成-共还原法制备钨铜复合粉末,再通过真空热压烧结法制备钨铜复合材料,并研究了钨铜复合粉末的结构形貌,以及经不同温度热处理后钨铜复合材料的显微形貌、物性特征。结果表明:采用水热合成-共还原法可制得粒度尺寸约为70nm且颗粒分布均匀的纳米级钨铜复合粉末。钨铜复合粉末经加压烧结及热处理后可得到W相和Cu相紧密结合、Cu相均匀分布在W相周围的钨铜复合材料,其在热处理温度为950℃时致密度最高,达到99.2%;在热处理温度为800℃时导电率最高,达到46.5%IACS;在热处理温度为900℃时布氏硬度最高,达到HB285。With sodium tungstate and cupric nitrate as raw materials,W-Cu composite powders were prepared by hydrothermal synthesis and coreduction process, and then W-Cu composite materials were prepared by vacuum hot-pressing sintering. The microstructure and morphology of W-Cu composite powders and the micromorphology and physical characteristics of W-Cu composite materials were investigated. The results indicate that the W-Cu nanocomposite powders prepared by hydrothermal synthesis and coreduction process are well distributed,with particle size of about 70 nm. Then W-Cu composite materials can be obtained by pressure sintering and heat treatment,in which Cu phase is well distributed around W phase and the two phases are closely bonded. Its relative density reaches the maximum of 99.2% at the heat treat- ment temperature of 950 ℃, its electrical conductivity reaches the maximum of 46.5 % IACS at the heat treatment temperature of 800 ℃ ,and its Brinell hardness reaches the maximum of HB285 at the heat treatment temperature of 900 ℃.

关 键 词：钨铜复合粉末 钨铜复合材料 水热合成-共还原 加压烧结 热处理 

分 类 号：TG146.411[一般工业技术—材料科学与工程]