Spherical modification of tungsten oxide powder and its mechanism analysis
来源期刊：Rare Metals2015年第3期
论文作者：Cong-Cong Wang Cheng-Chang Jia Peng Gao Guo-Cheng Gai Yu-Fen Yang
文章页码：183 - 188
摘 要：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 particles 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 min: the powder particles become nearly spherical and their sharp edge angles are rounded off and reshaped. When the processing time is 60min, 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°C for 2h and its flow ability is significantly improved.
Cong-Cong Wang1，Cheng-Chang Jia1，Peng Gao1，Guo-Cheng Gai2，Yu-Fen Yang2
1. School of Materials Science and Engineering,University of Science and Technology Beijing2. Powder Technology R&D Group,Department of Material Science and Engineering,Tsinghua University
摘 要：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 particles 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 min: the powder particles become nearly spherical and their sharp edge angles are rounded off and reshaped. When the processing time is 60min, 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°C for 2h and its flow ability is significantly improved.
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