Preparation and characterization of W-Cu nanopowders by a homogeneous precipitation process
Preparation and characterization of W-Cu nanopowders by a homogeneous precipitation process
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DOI：
10.1016/j.jallcom.2005.08.087
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发表时间：
2006-09
影响因子：
6.2
通讯作者：
Jigui Cheng;Chun-yi Lei;Ertao Xiong;Yang Jiang;Yonghong Xia
中科院分区：
文献类型：
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作者：
Jigui Cheng;Chun-yi Lei;Ertao Xiong;Yang Jiang;Yonghong Xia
采用一种新的均匀沉淀法制备纳米W-Cu粉末。首先在氨水溶液中加入钨酸钠和氯化铜，然后加热脱氨得到CuWO4·2H2O和Cu2(OH)2WO4沉淀。沉淀物经过洗涤、干燥和脱水，然后在H_2气氛中还原，转化为W-Cu复合粉末。对沉淀物、W-Cu复合粉末及其烧结件的性能进行了表征。结果表明，均相沉淀法制备的W-Cu粉末呈近球形，颗粒尺寸在50~100 nm之间，W、Cu组分混合均匀。在1050℃和1150℃下烧结的W-Cu样品的相对密度分别达到94%和98%以上。W-Cu烧结件组织均匀，具有良好的物理力学性能。
A novel homogeneous precipitation process was employed to prepare nanosized W–Cu powders. Precipitates of CuWO4·2H2O and Cu2(OH)2WO4were first obtained by adding sodium tungstate and copper chloride into aqueous ammonia solution, and then heating the solution to remove ammonia. The precipitates were subsequently washed, dried and dehydrated, followed by reducing in H2atmosphere to convert into W–Cu composite powders. Properties of the precipitates, as well as the W–Cu composite powders and their sintered parts were characterized. It was shown that W–Cu powders produced by the homogeneous precipitation process have a nearly spherical shape, with particle size ranging from 50 to 100nm and a well-mixed state of W and Cu ingredients. Relative density of more than 94% and 98% was obtained for W–Cu samples sintered at 1050 and 1150°C, respectively. Homogeneous microstructure, good physical and mechanical properties were also achieved for the sintered W–Cu parts.