Title page for ETD etd-12022008-063010

Type of Document Master's Thesis
Author Fitzgerald, Shawn
URN etd-12022008-063010
Title A pneumatic conveying powder delivery system for continuously heterogeneous material deposition in solid freeform fabrication
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Bohn, Jan Helge Committee Chair
Kander, Ronald C. Committee Member
Myklebust, Arvid Committee Member
  • Freeform Powder Molding
  • rapid prototyping
  • 3D Printing
  • powder deposition
  • Selective Laser Sintering
Date of Defense 1996-07-05
Availability restricted

Great improvements are continuously being made in the solid free form fabrication (SFF) industry in terms of processes and materials. Fully functional parts are being created directly with little, if any, finishing. Parts are being directly fabricated with engineering materials such as ceramics and metals. This thesis aims to facilitate a substantial advance in rapid prototyping capabilities, namely that of fabricating parts with continuously heterogeneous material compositions. Because SFF is an additive building process, building parts layer-by-layer or even point-by-point, adjusting material composition throughout the entire part, in all three dimensions, is feasible. The use of fine powders as its build material provides the potential for the Selective Laser Sintering (SLS), ThreeDimensional Printing (3DP), and Freeform Powder Molding (FPM) processes to be altered to create continuously heterogeneous material composition. The current roller distribution system needs to be replaced with a new means of delivering the powder that facilitates selective heterogeneous material compositions. This thesis explores a dense phase pneumatic conveying system that has the potential to deliver the powder in a controlled manner and allow for adjustment of material composition throughout the layer.

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