Research on rheological properties and extrusion behavior of aqueous alumina paste in paste-extrusion-based SFF processes

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• 作者：Hongjun Liu ; Yamin Li ; Dongjian Li
• 关键词：Aqueous alumina paste ; Rheological properties ; Extrusion behavior ; Solid freeform fabrication
• 刊名：The International Journal of Advanced Manufacturing Technology
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：83
• 期：9-12
• 页码：2039-2047
• 全文大小：734 KB
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• 作者单位：Hongjun Liu (1)
  Yamin Li (1)
  Dongjian Li (1)
  
  1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, 287 Langongping Rd., Lanzhou, 730050, Gansu, People’s Republic of China
  
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Production and Logistics
  Mechanical Engineering
  Computer-Aided Engineering and Design
  
• 出版者：Springer London
• ISSN：1433-3015

文摘

In this work, the rheological properties and extrusion behavior of aqueous alumina paste which can be used in paste-extrusion-based solid freeform fabrication (SFF) processes are presented. According to the analysis of dynamic viscoelastic properties, the aqueous alumina paste with solid loading of 50 vol% can be treated as a viscous–elastic–plastic body in the extrusion process. The paste shows the viscoelastic feature before yielding and viscoplastic feature after yielding. Although the paste possesses shear-thinning behavior, it can be extruded steadily due to relatively steady apparent viscosity within the range of shearing rate in the actual paste extrusion process. The ram extrusion experiments show that the variation of extrusion pressure is essentially determined by the rheological behavior of paste. The average extrusion pressure in steady extrusion stage can be estimated by Benbow–Bridgwater model. However, there exists a ram velocity threshold (0.1 mm/s in this study) below which the liquid phase migration will be significant and the extrusion pressure is hardly estimated. Due to the viscoplastic fluid feature of paste, the extrudate velocity cannot immediately reach to the expected value when paste extrusion starts and stops, and it could result in the imprecise deposition and “die drooling,” which can be improved by the operation of pulling back of ram.