仲钨酸铵（APT）中温还原制取粗晶钨粉

以仲钨酸铵（APT）为原料,加入添加剂Li、Na盐在1000℃湿氢条件下还原制得粗晶钨粉。通过SEM、XRD和激光粒度仪对粗晶钨粉形貌、物相组成及粒度分布进行表征。研究了还原温度,时间,Li、Na盐的种类及含量对钨粉粒度的影响。结果表明,采用APT为原料,Li2CO3为添加剂,在1000℃,180min湿氢条件下,直接还原制备出了流动性良好、结晶完整的粗晶钨粉,平均粒径≥40μm。

The coarse grain tungsten powder reduced by ammonium paratungstate at medium temperature

In this paper,the coarse-grained tungsten powder was reduced by using ammonium paratungstate（APT） as raw materials and additive Li,Na salt at 1000 ℃ wet hydrogen condition.The morphology,phase composition and size distribution of coarse-grained tungsten powder were characterized by using SEM,XRD and laser particle size analyzer.The effect of temperature and time of reduction,types and content of Li and Na salt on the grain size of tungsten powder was studied.The result shows that the coarse-grained tungsten powder can be reduced directly using APT as raw materials and Li2CO3 as additive under the wet hydrogen condition at 1000℃ for 180min,which has well liquidity and integrated crystal,the average particle size is above 40μm.