Keywords and Phrases
Additive manufacturing; Al2O3; Extrusion freeform fabrication
"In order to understand the effect of fabrication temperature, a computer controlled 3-D gantry system was used to extrude aqueous alumina paste using Extrusion Freeform Fabrication. The system includes a temperature control subsystem that allows for fabrication of components below the paste's freezing temperature in the range of -10⁰C to -30⁰C and a hot plate with temperature in the range of 20⁰C to 80⁰C inside a room temperature chamber. Comparisons in terms of relative density, mechanical properties, part accuracy and minimum deposition angle were performed by Extrusion Freeform Fabrication at 40⁰C plate temperature inside a room temperature chamber and at -20⁰C plate temperature with a -20⁰C chamber temperature.
The parts fabricated at 40⁰C were able to achieve relative density, Young's modulus and flexure strength as high as 96.73%, 311 GPa, and 338 MPa, respectively; the minimum deposition angle achieved was 50⁰ at 38 mm bottom diameter and the parts had 7-14% shrinkage after sintering. In comparison, for the parts fabricated at -20⁰C, the average relative density, Young's modulus and flexure strength obtained were 91.55%, 280 GPa, and 300 MPa, respectively; parts could be fabricated with a 24⁰ minimum deposition angle at 64 mm bottom diameter and had 10-16% shrinkage after sintering. The hardnesses of parts fabricated at 40⁰C and fabricated at -20⁰C were 16.78 GPa and 14.36 GPa, respectively. Microstructures were studied by using SEM to obtain a deeper understanding of the fabrication temperature effect."--Abstract, page iii.
Leu, M. C. (Ming-Chuan)
Landers, Robert G.
Mechanical and Aerospace Engineering
M.S. in Mechanical Engineering
Missouri University of Science and Technology
viii, 39 pages
© 2015 Jie Li, All rights reserved.
Thesis - Open Access
Library of Congress Subject Headings
Solid freeform fabrication
Ceramics -- Extrusion
Aluminum oxide -- Thermal properties
Electronic OCLC #
Link to Catalog Recordhttp://laurel.lso.missouri.edu/record=b10848585~S5
Li, Jie, "An experimental study of fabrication temperature effect on aqueous extrusion freeform fabrication" (2015). Masters Theses. 7403.