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胡可,杨世松,邹黎明,韩胜利,崔利群,刘辛.粉末粒形对钨粉末注射成形喂料流变性能的影响[J].稀有金属材料与工程(英文),2020,49(10):3472~3478.[Hu Ke,Yang Shisong,Zou Liming,Han Shengli,Cui Liqun and Liu Xin.Effect of Powder Shape on Rheological Properties of Tungsten Feedstocks for Metal Powder Injection Molding[J].Rare Metal Materials and Engineering,2020,49(10):3472~3478.]
Effect of Powder Shape on Rheological Properties of Tungsten Feedstocks for Metal Powder Injection Molding
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Received:October 08, 2019  Revised:November 06, 2019
DOI:
Key words: image analysis method  powder injection molding  tungsten  particle shape  rheological property
Foundation item:广东省国际合作专项(2018A050506010);广东省重大科技专项(2018B090904004);广东省科学院实施创新驱动发展能力建设专项(2018GDASCX-0963);广州市国际合作专项(201907010030);广东省科学院建设国内一流研究机构行动专项资金项目(2019GDASYL-0105077);广州市科技项目(201906040007)
Author NameAffiliation
Hu Ke,Yang Shisong,Zou Liming,Han Shengli,Cui Liqun and Liu Xin  
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Abstract:
      In this paper, the particle shape and size of tungsten powders were quantitatively analyzed by image analysis technology, and the effect of particle shape on the rheological properties of tungsten feedstocks for metal powder injection molding (MIM) was alao investigated. The results showed that the particle size of narrow particle-sized tungsten (NPW) powder was almost the same as that of spherical tungsten (SW) powder. In contrast to NPW powders, the SW powders exhibited better sphericity, surface smoothness and dispersion. Mixing with the same binder, the solid loading of SW powders was 64%, which was higher than that of 59% of the NPW powders. The SW feedshocks showed better flow performance, i.e., lower flow behavior index and flow activation energy, and it thus was more suitable for injection molding. Particle shape affects the rheology of tungsten MIM feedstocks by changing the nature of organic binder–particle and particle–particle interactions.