Effect of Y2O3 doping on preparation ultrafine/nano-tungsten powder and refinement mechanism

• Published in: Tungsten Vol. 5; no. 4; pp. 539 - 547
• Main Authors: Lv, Dong-Dong, Sun, Yu, Zhang, Jian-Bo, Guo, Sheng-Da, Liu, Bai-Xiong
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.12.2023; Springer Nature B.V
• Subjects: Aspect ratio; Chemistry and Materials Science; Doping; Grain boundaries; Grain growth; Grain size; Hydrogen; Hydrogen reduction; Materials Engineering; Materials Science; Mechanical properties; Metallic Materials; Morphology; Nitrates; Nuclear Chemistry; Original Paper; Particle and Nuclear Physics; Particle size; Particle size distribution; Powder metallurgy; Raw materials; Scanning electron microscopy; Spray drying; Temperature; Tungsten; Ultrafines; Yttrium; Yttrium oxide; Japan; Tungsten powder; Yttrium oxide; Hydrogen reduction
• ISSN: 2661-8028; 2661-8036
• DOI: 10.1007/s42864-022-00172-3

In this study, ultrafine/nano W–Y 2 O 3 composite powders were synthesized by spray drying, roasting and two-step hydrogen reduction using ammonium metatungstate and yttrium nitrate as raw materials. The mechanism of the influence of Y 2 O 3 on the growth of WO 2.72 and the particle refinement of tungsten powder is discussed. The effect of Y 2 O 3 particles on the reduction behavior of tungsten powder was investigated using scanning electron microscopy to study the near surface morphology and X-ray diffraction for phase ID (composition) and crystal structural changes for the reduced powders at each step. The results show that the doping of 0.3 wt.% Y 2 O 3 can significantly increase the aspect ratio of WO 2.72 in the first step of hydrogen reduction. Moreover, Y 2 O 3 can effectively inhibit the growth of tungsten particles in the hydrogen reduction process. Therefore, The Y 2 O 3 -doped tungsten powders have finer particles and a narrower particle size distribution range than the undoped powders. The average particle diameter of 0.3 wt.% Y 2 O 3 doping tungsten powder was in the range of 90–120 nm.