不同氧化钨还原制备钨粉及其特性研究

Study on Preparation of Tungsten Powders by Reduction with Different Tungsten Oxides and their Characteristics

分别以掺铬氧化钨、紫钨和黄钨为原料,在不同反应温度下进行氢还原制备得到了钨粉。利用XRD、SEM等对不同氧化钨还原制备钨粉的物相和微观形貌进行分析,并探究了铬掺杂对氧化钨还原过程的影响。结果表明:在相同还原条件下,紫钨由于疏松透气的细针状结构,最易进行还原,制备出的W粉分散性好,粒度较细且分布均匀;掺铬氧化钨由于Cr_(2)O_(3)的抑制作用,还原难度最大,制备出的W粉存在大量细晶聚集,粉末粒度均匀性差,但平均粒度较小;黄钨则由于致密不透气的立方体结构,还原难度介于紫钨和掺铬氧化钨之间,制备出的W粉粒度较粗,团聚也较为严重。

Tungsten powders were prepared by hydrogen reduction with chromium-doped tungsten oxide, purple tungsten oxide and yellow tungsten oxide as raw materials at different reaction temperatures.The phase and microstructure of tungsten powders prepared by reduction of different tungsten oxides were analyzed by XRD and SEM,and the influence of chromium doping on the reduction process of tungsten oxide was explored.The results show that under the same reduction conditions, purple tungsten oxide is the easiest to reduce due to its loose and breathable fine needle-like structure, and the prepared W powder has good dispersibility, fine particle size and uniform distribution.Chromium-doped tungsten oxide is the most difficult to reduce due to the inhibitory effect of Cr_(2)O_(3),and the prepared W powder has a large number of fine-grained aggregates, with poor powder particle size uniformity and small average particle size.The reduction difficulty of yellow tungsten oxide is between purple tungsten oxide and chromium-doped tungsten oxide due to its dense and airtight cubic structure, and the prepared W powder has coarse particle size and serious agglomeration.