Cu-20%W原位复合粉末的制备工艺

采用原位化学共沉淀法，高温下加入Na2CO3精确控制前驱体粉末CuWO4×Cux(OH)yCO3的组成，再经二段氢还原工艺制备Cu-20%W复合粉末，对其形貌、物相组成、元素及粒度分布进行了表征. 结果表明，在原位反应液pH=5、温度75℃及(NH4)2WO4/Na2CO3摩尔比1/10.578、反应液总体积300 mL条件下，所得前驱体为CuWO4与Cu4(OH)6CO3组成的浅绿色络合物，合金元素收率高于95%；经450℃下0.5 h和600℃下0.5 h二段氢还原，得到粒径400~800 nm的亚微米级圆球状Cu-20%W复合粉末，钨半包覆铜且两相均匀分布.

Preparation of Cu-20%W Composite Powders via in-situ Reaction

In-situ co-precipitation method was adopted to get precursor powder CuWO4-Cux(OH)yCO3 in which the elements content was controlled precisely by using Na2CO3 at high temperatures. Fine Cu-20%W composite powders were obtained through subsequent two-stage hydrogen reduction. The structure, phase composition, distributions of elements and particle size of the prepared powders were characterized. The results showed that the pale green precursor powders mainly consisted of CuWO4 and Cu4(OH)6CO3 under the reaction conditions of pH 5, temperature 75℃, the (NH4)2WO4/Na2CO3 molar ratio of 1/10.578 and the reaction solution 300 mL. The element recovery rate reached 95%. After two-stage hydrogen reduction of 0.5 h at 450℃ and 0.5 h at 600℃, the composite powder particle was nearly spherical in shape with a size of 400~800 nm. Copper was semi covered by tungsten and the two elements distributed uniformly.