Research on Extrusion Velocity in Freeform Extrusion Fabrication of Aqueous Alumina Paste

Abstract:

The Freeform Extrusion Fabrication (FEF) is a Solid Freeform Fabrication process, which fabricates 3D ceramic green parts by extruding an aqueous ceramic paste of high solids loading. The extrusion velocity is a very important parameter and should be better understood. In this paper, experiments were carried out to investigate extrusion velocity in FEF extrusion process of aqueous alumina paste. It is found that the extrusion velocity has a corresponding relationship with extrusion force. The extrusion run can be divided into 4 stages: compaction stage, transient stage, steady stage and stop stage. The step ram velocity input was applied in FEF process and improved the extrusion velocity profiles in transient stage.

• Periodical: Key Engineering Materials (Volumes 419-420)
• Pages: 125-128
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.419-420.125
• Online since: October 2009
• Authors: Hong Jun Liu, Ming C. Leu
• Keywords: Alumina Paste, Extrusion Velocity, Freeform Extrusion Fabrication, RAM Extrusion

References

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[3] Michael S. Mason, Tieshu Huang, Robert G. Landersa, Ming C. Leu and Gregory E. Hilmas: Journal of materials processing technology Vol. 209 (2009), p.2946.

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[6] [8] [10] [12] [14] ram velocity input ( µm/s) extrusion time (s) ram velocity input.

50 100 150 200 250 300.

[10] [20] [30] [40] [50] [60] ram velocity ( µm/s) extrusion time (s) ram velocity input.