微量Fe元素对氧化钨粉还原过程的影响  

Effect of trace Fe doping on the hydrogen reduction behaviors of WO_(3) powders

作　　者：陈树群 胡海栋 周文元[1] 胡鹏[1] 李洪义[1] 王金淑[1] CHEN Shu-qun;HU Hai-dong;ZHOU Wen-yuan;HU Peng;LI Hong-yi;WANG Jing-shu(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124

出　　处：《粉末冶金技术》2021年第3期209-215,共7页Powder Metallurgy Technology

基　　金：国家重点研发计划专项资助项目(2017YFB0305600);国家自然科学基金资助项目(51904015);北京市教委科研计划资助项目(KM202010005008)。

摘　　要：采用液–固掺杂结合两步氢还原法分别制备未添加和添加质量分数0.1%和1.0%Fe的金属W粉,研究了微量Fe元素对WO_(3)还原过程及产物结构特征的影响。结果表明:WO_(3)前驱体粉体经掺杂和煅烧处理后,在其颗粒表层晶格中形成了含Fe固溶体;在氢气还原过程中,Fe的固溶能够降低WO_(2.9)→WO_(2)和WO_(2)→W的还原温度,促进WO_(3)中裂纹和空隙的产生,细化还原W粉尺寸;还原后Fe元素由偏聚在WO_(3)颗粒表面迁移到W颗粒内部,其分布规律发生了明显转变。Tungsten powders without and with Fe doping(0.1%and 1.0%in mass fraction)were prepared by liquid‒solid doping and two-step hydrogen reduction method,respectively.The influences of trace Fe on the reduction behaviors of WO3 powders and the microstructure characteristic of W powders were systematically studied.The results indicate that the Fe-containing solid solution is formed in the surface crystal lattice of WO3 particles after doping and calcination.In the process of hydrogen reduction,Fe solution can reduce the reaction temperatures of WO_(2.9)→WO_(2) and WO_(2)→W,promote the formation of micro-cracks and holes in the WO_(3),and refine the particle size of tungsten powders.After reduction,Fe migrates from the surface of WO_(3) particles to the interior of tungsten particles,and the Fe distribution changes obviously.

关 键 词：微量Fe 钨粉 氢还原 掺杂 超细粉末 

分 类 号：TF123[冶金工程—粉末冶金]