"This research investigates the fabrication of three-dimensional parts from ZrB₂, an ultra high temperature ceramic (UHTC), using the selective laser sintering (SLS) process. Based on an experimental investigation, optimum values for the SLS parameters (scan speed, laser power, energy density, scan spacing and layer thickness), used on a DTM Sinterstation 2000, were determined to build green ZrB₂ parts with high integrity and sharp geometrical features. This was done by melting the polymer binder used to bond the ceramic particles layer-by-layer according to the cross-section of a CAD model. The use of a sacrificial plate to eliminate cracks in the bottom of the part was demonstrated and the proper number of separation layers between the sacrificial plate and the main part was determined experimentally. The fabricated green parts went through post processing steps including binder burnout and sintering in furnaces at appropriate temperature schedules to remove the binder and sinter the ZrB₂ particles. Several test bars were fabricated and determined to have good properties with an average relative density of 87% and an average flexural strength of 250 MPa"--Abstract, page iv.
Leu, M. C. (Ming-Chuan)
Liou, Frank W.
Mechanical and Aerospace Engineering
M.S. in Manufacturing Engineering
Missouri University of Science and Technology
ix, 59 pages
© 2009 Shashwatashish Pattnaik, All rights reserved.
Thesis - Restricted Access
Zirconium compounds -- Extrusion
Ceramic-matrix composites -- Mechanical properties
Ceramic-matrix composites -- Microstructure
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu:80/record=b10179357~S5
Pattnaik, Shashwatashish, "Investigation of selective laser sintering of zirconium diboride parts" (2009). Masters Theses. 4509.
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