Spherical modification of tungsten oxide powder and its mechanism analysis

• Published in: Rare metals Vol. 34; no. 3; pp. 183 - 188
• Main Authors: Wang, Cong-Cong, Jia, Cheng-Chang, Gao, Peng, Gai, Guo-Cheng, Yang, Yu-Fen
• Format: Journal Article
• Language: English
• Published: Springer Berlin Heidelberg Nonferrous Metals Society of China 01.03.2015; Springer Nature B.V
• Subjects: Biomaterials; Chemistry and Materials Science; Energy; Equipment costs; Grain size distribution; Industrial engineering; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Oxides; Particle size; Particulate composites; Physical Chemistry; Rotational; Scanning electron microscopy; Tungsten; 扫描电子显微镜; 改性; 晶粒尺寸分布; 机理分析; 氧化; 球形; 生产成本; 钨粉末; Grain size; Modification; Particle composite system; Nearly spherical tungsten powder
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-014-0370-8

Owing to its high production costs, complexity of equipment, and difficulty in controlling parameters, spherical or subglobose tungsten powder preparation method cannot meet the demand of industrial production. Tungstic oxide powder was treated by particle composite system and its effects were studied. Morphologies of par- ticles were investigated by scanning electron microscopy （SEM）. Particle size analysis was carried out and the related mechanism was discussed. The results show that the processing effect is best when the rotational speed is set at 4,000 r.min-1 for 15 rain： the powder particles become nearly spherical and their sharp edge angles are rounded off and reshaped. When the processing time is 60 min, the powders smash to pieces because of too much energy inputting. So the test results, such as grain size distribution, can be explained well. Nearly spherical tungsten powder is obtained after reduction at 780 ℃ for 2 h and its flow ability is significantly improved.